HELP PLEASE !!!! When light passes from air to water, what happens to the speed of the light?
speeds up
slows down
stays the same
Option 2
Answers
Answer:
slows down is correct answerExplanation:
What happens is that light slows down when it passes from the less dense air into the denser glass or water.This slowing down of the ray of light also causes the ray of light to change direction. It is the change in the speed of the light that causes refraction.hope it is helpful to you please follow give brainliestRelated Questions
Using a cable with a tension of 1350 N , a tow truck pulls a car 5.00 km alond a horizontal roadway. (a) how much work does the cable do on the car if it puls horizontally ? if it pulls at 35.0 degrees above the horizontal ? (b) how much work does the cable do on the tow truck in both cases of part (a)? (c) how much work does gravity do on the car in part (a)?
Answers
Using a cable with a tension of 1350 N , a tow truck pulls a car 5.00 km alone a horizontal roadway. Therefore,
(a) Cable work: 6,750,000 J horizontally.
(b) Cable work: 6,308,250 J at 35.0° above horizontal.
(c) No work by gravity.
To calculate the work done by the cable in each scenario, we need to consider the angle between the direction of the force applied and the displacement.
(a) If the cable pulls horizontally (0° above the horizontal):
In this case, the angle between the force and the displacement is 0 degrees, so the work done can be calculated as:
Work = Force * Displacement * cos(Ф)
Work = 1350 N * 5000 m * cos(0°)
Work = 1350 N * 5000 m * 1
Work = 6,750,000 J
The cable does 6,750,000 Joules of work on the car when it pulls horizontally.
(b) If the cable pulls at 35.0 degrees above the horizontal:
In this case, the angle between the force and the displacement is 35.0 degrees, so the work done can be calculated as:
Work = Force * Displacement * cos(Ф)
Work = 1350 N * 5000 m * cos(35.0°)
Work = 1350 N * 5000 m * 0.819
Work = 6,308,250 J
The cable does approximately 6,308,250 Joules of work on the car when it pulls at 35.0 degrees above the horizontal.
(c) The work done by gravity on the car is zero because gravity acts vertically downward, perpendicular to the displacement along the horizontal roadway. Therefore, the gravitational force does not contribute to the work done on the car in this scenario.
In both cases (a) and (b), the cable does the same amount of work on the tow truck as on the car since they are connected by the cable. So the work done by the cable on the tow truck would be equal to the values calculated above: 6,750,000 J in case (a) and 6,308,250 J in case (b).
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Blackie, a cat whose mass is 6-kg, is napping on top of the refrigerator when he rolls over and fall. Blackie has a KE of 90-J just before he lands on his feet on the floor.
How tall is the refrigerator?
Answers
To answer this question, you need to understand the law of conservation of energy. Essentially, the law states that energy cannot be created or destroyed; it is always conserved.
Knowing this law, how can we answer this question? Well, let's look at what the question tells us. We know that Blackie was initially at the top of a refrigerator before rolling over and falling to the ground. At ground level, he only has Kinetic energy when he lands. Since we know that he started at the top of the fridge, we know that Blackie started off with potential gravitational energy.
That would make sense, right? Written out as an equation, it'd be:
\(U_{g}\) = \(K_{E}\)
This follows the law of conservation of energy, as all the potential gravitational energy is converted into Kinetic energy.
Now, we know what energies are converted. What can we do with it? Recall the equation of potential gravitational energy:
\(U_{g}\) = \(F_{g}\)∆H
\(U_{g}\) = mg∆H
Do you see it now? ∆H is the distance that Blackie falls, and since Blackie jumps from the fridge to the ground, ∆H must be the height of the fridge!
Let's start solving for ∆H:
\(U_{g}\) = \(K_{E}\)
Substitute potential gravitational energy with our equation:
mg∆H = \(K_{E}\)
We were given the value of Kinetic Energy:
mg∆H = 90
Isolate ∆H by dividing both sides by mg:
∆H = \(\frac{90}{mg}\)
Input values for 'm' and 'g' (m is the mass of Blackie and g is Earth's acceleration)
∆H = \(\frac{90}{6*9.80}\)
∆H = \(\frac{90}{58.8}\)
∆H = 1.53
The refrigerator is 1.53 meters tall.
And that's it! Let me know if you need me to explain anything I did here.
- breezyツ
Space questions
Please help
Answers
Answer:
(1) The relationship between the altitude height, 'h', and the orbital speed, \(v_{orbit}\), of the satellite is an inverse relationship
\(v_{orbit}\) = 1/(h + R)
(2) The height of the satellite, is approximately 24,442 meters
(3) Please find attached the drawing showing the two lines that indicate the direction of the gravitational force on the satellites created with Microsoft Visio
Explanation:
(1) From the given data table, as the altitude increases, the orbital velocity decreases, therefore, the relationship between altitude, 'h', and orbital velocity, '\(v_{orbit}\)', is an inverse relationship which can be expressed as follows;
\(v_{orbit} = \sqrt{\dfrac{G \cdot M}{r} }\)
Where;
G = The universal gravitational constant
M = The mass of the Earth, or planet about which the satellite orbits
r = The distance between the center of the planet and the satellite = h + R
R = The radius of the planet
When \(v_{orbit}\) = 27,500, h = r - R = 1000
We have;
\(v_{orbit}\)² ∝ 1/r
\(v_{orbit}\)² = k/r = k/(R+ h)
When, \(v_{orbit}\)² = 27,500² = 756,250,000
r = h + R = 1000 + R
∴ 756,250,000 = k/(1000 + R)
(1,000 + R) × 756,250,000 = k
When, \(v_{orbit}\)² = 18,000² = 324,000,000
r = h + R = 10,000 + R
∴ 324,000,000 = k/(10,000 + R)
324,000,000 = ((1,000 + R) × 756,250,000)/(10,000 + R)
∴ 324,000,000×(10,000 + R) = (1,000 + R) × 756,250,000
R × (756,250,000 - 324,000,000) = 324,000,000×10,000 - 1,000 × 756,250,000
R = (324,000,000×10,000 - 1,000 × 756,250,000)/(756,250,000 - 324,000,000) = 5746.09600925
R = 5,746.09600925
k = (1,000 + R) × 756,250,000 = (1,000 + 5,746.09600925) × 756,250,000 = 5.1017351 × 10¹²
k = 5.1017351 × 10¹²
(2) When, \(v_{orbit}\) = 13,000 m/s, we have;
13,000² = 5.1017351 × 10¹²/(5,746.09600925 + h)
∴ 5,746.09600925 + h = 5.1017351 × 10^(12)/(13,000²) = 30187.7816568
h = 30187.7816568 - 5,746.09600925 = 24,441.6856476
The height of the satellite, h ≈ 24,442 meters
(3) Please find attached the drawing showing the two lines indicating the direction of the force of gravity exerts on the satellites created with Microsoft Visio.
A plane has an eastward heading with an airspeed of 156 m/s. A 20.0 m/s wind is blowing southward at the same time as the plane is flying. The velocity of the plane relative to the ground is
Answers
To find the velocity of the plane relative to the ground, we need to use vector addition. The eastward airspeed of the plane is one vector, while the southward wind speed is another vector. The resulting vector is the velocity of the plane relative to the ground.
Using the Pythagorean theorem, we can find the magnitude of the resulting vector:
Velocity^2 = (156 m/s)^2 + (20.0 m/s)^2
Velocity = sqrt[(156 m/s)^2 + (20.0 m/s)^2]
Velocity = 158.1 m/s
The direction of the resulting vector can be found using trigonometry. We can use the tangent function to find the angle between the eastward direction and the direction of the resulting vector:
tan(theta) = opposite/adjacent
tan(theta) = (20.0 m/s)/(156 m/s)
theta = 7.3 degrees south of east
Therefore, the velocity of the plane relative to the ground is 158.1 m/s at an angle of 7.3 degrees south of east.
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Please help me explain in details for all question 1. Thank you.
QUESTION 1 a) Calculate the density of the moon by assuming it to be a sphere of diameter 3475 km and having a mass of 7.35 x 1022 kg. Express your answer in g/cm³. (3 marks) b) A car accelerates fro
Answers
Density is the ratio of mass to volume of an object. To calculate the density of the moon, we will use the formula:ρ = m/V where ρ is the density, m is the mass, and V is the volume.
The volume of a sphere is given as:V = (4/3)πr³where r is the radius of the sphere. The diameter of the moon is given as 3475 km, its radius is:r = (3475/2) km = 1737.5 km = 1.7375 x 10⁶ m Substituting the values of m and V in the formula for density,
we have:ρ = m/V= (7.35 x 10²² kg)/[(4/3)π(1.7375 x 10⁶ m)³]= 3.35 g/cm³ , the density of the moon is approximately 3.35 g/cm³.b) .
We can calculate the final velocity of the car by using the formula:v² = u² + 2 as where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the distance traveled.
Substituting the values given, we have:v² = (0 m/s)² + 2(4.5 m/s²)(110 m)= 990 m²/s² Taking the square root of both sides, we get:v = √(990 m²/s²)≈ 31.4 m/s , the final velocity of the car is approximately 31.4 m/s.
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Let V be an F-vector space.
a) Show that if SV then (S) = S.
b) Let W. W₂ V. Show that (W₁U W ₂ ) = W₁ + W₂.
Answers
a) If S is a subspace of vector space V, then the span of S, (S), is equal to S itself.
To show that if S⊆V, then (S) = S, we need to prove two inclusions:(i) (S) ⊆ S:
By definition, (S) is the smallest subspace of V that contains S. Since S⊆(S), it follows that every element in S is also in (S). Therefore, S is a subset of (S).(ii) S ⊆ (S):
Let's consider S as a subspace of V. Since S is already a subspace, it satisfies all the properties of a vector space, including closure under scalar multiplication and addition. Therefore, S is a subset of itself.
Combining both inclusions, we conclude that (S) = S.
b)The span of the union of subspaces W₁ and W₂, (W₁ ∪ W₂), is equal to the sum of W₁ and W₂, denoted by W₁ + W₂.
To show that (W₁ ∪ W₂) = W₁ + W₂, we need to prove two inclusions:
(i) (W₁ ∪ W₂) ⊆ W₁ + W₂:
Let's take an element x from (W₁ ∪ W₂). This means that x is an element of either W₁ or W₂ (or both). If x∈W₁, then x is in the subspace W₁, and therefore, it is also in the sum W₁ + W₂. Similarly, if x∈W₂, then x is in the subspace W₂, and hence it is also in the sum W₁ + W₂. Therefore, any element x from (W₁ ∪ W₂) is also in W₁ + W₂, which implies (W₁ ∪ W₂) ⊆ W₁ + W₂.
(ii) W₁ + W₂ ⊆ (W₁ ∪ W₂):
Let's take an element y from W₁ + W₂. By definition, this means that y can be expressed as the sum of an element in W₁ and an element in W₂. Therefore, y is either an element of W₁ or an element of W₂ (or both), and hence y is in the union (W₁ ∪ W₂). Therefore, any element y from W₁ + W₂ is also in (W₁ ∪ W₂), which implies W₁ + W₂ ⊆ (W₁ ∪ W₂).Combining both inclusions, we conclude that (W₁ ∪ W₂) = W₁ + W₂.
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You are playing tennis and return a volley. Identify a force pair.
Answers
During a tennis volley, the force pair involved is the action-reaction forces.
When playing tennis and returning a volley, the force pair involved is the action and reaction forces. In the process of hitting the ball, the tennis racket exerts a force on the ball, which is the action force.
The ball, in turn, exerts an equal and opposite force on the racket, which is the reaction force.Both the racket and the ball experience the force of impact during the volley.
The force applied by the racket causes the ball to move forward, while the equal and opposite force applied by the ball pushes the racket back.
These two forces are referred to as action-reaction forces or force pairs. A force pair refers to a pair of forces that are equal in magnitude but opposite in direction.
These forces always act on different objects and occur simultaneously. In this scenario, the action force was exerted by the tennis racket while the reaction force was exerted by the ball.
Therefore, during a tennis volley, the force pair involved is the action-reaction forces.
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a hair breaks under a tension of 1.2 n. what is the diameter of the hair? the tensile strength is 2.2 ✕ 108 pa.
Answers
The diameter of the hair is approximately 3.12 micrometers.
To find the diameter of the hair, we can use the formula for tensile strength:
Tensile strength = Force / Area
We know that the tension force is 1.2 N and the tensile strength is 2.2 ✕ 108 Pa. We can rearrange the formula to solve for the area (which will give us the cross-sectional area of the hair):
Area = Force / Tensile strength
Substituting the values we have:
Area = 1.2 N / 2.2 ✕ 108 Pa
Area = 5.45 ✕ 10^-9 m^2
Now, we can use the formula for the area of a circle to find the diameter:
Area = π/4 ✕ diameter^2
Solving for diameter:
diameter = √(4 ✕ Area / π)
Substituting the value we found for the area:
diameter = √(4 ✕ 5.45 ✕ 10^-9 / π)
diameter = 3.12 ✕ 10^-6 m
Therefore, the diameter of the hair is approximately 3.12 micrometers.
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A car travels 100m in 2s northbound. What is it’s velocity
Answers
Answer:
50m/s
Explanation:
velocity= displacement/time
v=100m/2
v=50m/s
If air resistance is negligible, a falling object can be considered
Answers
Answer:
Explanation:
freely falling object
What acceleration is produced when a 3000 N force acts on a 1,200 kg car?
Answers
I think you have to do 3000n times 1200kg an that will get ur answer
A 2-kg mass placed 30-cm to the left of the fulcrum is balanced by a 2-kg mass placed ______ cm to the right of the fulcrum.
Answers
Answer:
30 cm
Explanation:
0.06 or \(\frac{1}{15}\)
What is the effort and load arm?The lever has two “arms”:
The load arm is the portion of the lever directly connected to the load.
The effort arm is the portion of the lever to which we apply the effort, or input force.
The formula of the mechanical advantage(MA) of a lever is given as
MA = load/effort.
Given,
load = 2kg , effort = 30cm
MA = \(\frac{2}{30}\) = \(\frac{1}{15}\)
MA = 0.06 cm
Therefore,
A 2-kg mass placed 30-cm to the left of the fulcrum is balanced by a 2-kg mass placed 0.06 cm to the right of the fulcrum.
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compare the optical density air and glass
Answers
Answer:
Glass is an optically denser medium than air and water.
Explanation:
hope it helps have a nice night!
Answer:
The speed of light depends on the optical density of the medium. Therefore, light travels with different speeds in different media having different optical densities. For example, the speed of light in air is 3 × 108 m/s, whereas that in glass is 2 × 108 m/s and in water, it is 2.25 × 108 m/s
A 600-kg car is moving at 5 m/s then comes to a stop
in 3 seconds. How much average force is necessary?
Answers
The average force acting on the car is 1000 N.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
Given that: A 600-kg car is moving at 5 m/s then comes to a stop in 3 seconds.
Now according to Newton's 2nd law of motion:
Magnitude of force applied on the body = change in momentum/time interval
= I final momentum - initial momentum I/time interval
= I 0 - 600×5 I /3 N
= 10000 N
Hence, average force acting on the car is 1000 N.
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What is Newton's Law of Conservation of Momentum?
Answers
Answer: The law of conservation of linear momentum helps to understand the behavior of a Newton's cradle In a closed system. This law is nothing more than action and reaction.it can be used to predict the resulting direction and speed of motion of objects after they collide.
Explanation: Just as an example, when you play pool/8ball, the white play exerts force on the other balls causing them to break away.
hope this helps.
How are an electromagnetic wave’s wavelength and frequency related to the wave’s period of oscillation?.
Answers
a 75-kilogram bicyclist coasts down a hill at a constant speed of 12 meters per second. what is the kinetic energy of the bicyclist?
Answers
The bicycle rider's kinetic energy A cyclist has a kinetic energy of 2084.44 J.
What is the kinetic energy of a cyclist?Up to 90% of a woman's energy or movement can be converted into kinetic energy when riding a bicycle. The bike is then propelled by using this energy. While riding along a path, the bike is kept stable by the rider's momentum and balance.
How is kinetic energy calculated?The relationship between kinetic energy and an object's mass and square of the its velocity is direct: K.E. = ½ m v2. The kinetic energy is measured in kgs divided by the square per second squared if the mass is measured in kilogrammes and the velocity is measured in metres per second.
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work done in taking charge from one point of a conductor to is another point is called
Answers
Answer:
⁸
Explanation:
electric potential
I think so
If you planned to bike to a park that was five miles away, what average speed would you have to maintain to arrive in about 15 min? (
Answers
The average speed you need to maintain is 0.33 miles per minute.
The average speed is the speed that you maintain throughout the journey. It is obtained as; Total distance covered/Total time taken
If we have the following information from the question;
Distance covered = 5 miles
Time taken = 15 mins
Then it follows that;
Average speed = Distance/time
Average speed= 5 miles/15mins
Average speed = 0.33 miles per minute.
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the outer edge of a truck tire that has a radius of 50 cm has a velocity of 11 m/s. what is the angular velocity of the tire in rad/s?
Answers
Velocity of the outside edge is 26 m/s. The expression, which represents the relationship among constant speed and angular velocity,
Is it impossible to reach light speed?
No object can go more quickly than 300,000 kph (186,000 miles per second). Only massless particles, such as the photons that constitute light, are capable of traveling at that speed. Any material item cannot be accelerated to the light speed since doing so would require a limitless supply of energy.
Why does speed have a cap?
Two things are intended by speed limits. The main goal of speed restrictions is to increase safety by lowering the hazards brought on by drivers' speed decisions. The goal is to lessen speed differences and the likelihood of vehicle collisions.
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if Xrays and gamma rays kill cells, then how can they cause cancer where cancer is the uncontrolled division of cells
Answers
While X-rays and gamma rays can kill cells, their role in causing cancer is primarily through the damage they inflict on the DNA within cells. This damage can disrupt the normal control mechanisms of cell growth and division, leading to uncontrolled cell proliferation and the development of cancer. The risk of radiation-induced cancer depends on factors such as the dose and duration of exposure, the type of radiation, and individual susceptibility.
X-rays and gamma rays are forms of ionizing radiation that have the ability to damage cells and their DNA. It is true that excessive exposure to ionizing radiation can lead to cell death. However, it is important to understand that cancer is not simply the result of cell death, but rather the uncontrolled division and growth of cells.
Radiation-induced cancer occurs when the DNA within cells is damaged by ionizing radiation. This damage can lead to mutations in the genetic material, disrupting the normal control mechanisms that regulate cell division and growth. These mutations can cause cells to multiply uncontrollably, leading to the development of a tumor.
While ionizing radiation can kill cells, it can also damage the DNA within surviving cells. If the DNA damage occurs in genes that control cell growth and division, it can disrupt the normal checks and balances that prevent uncontrolled cell proliferation. Additionally, radiation can induce further mutations in DNA over time, increasing the risk of cancer development.
It is important to note that not all exposures to ionizing radiation result in cancer. The risk of developing cancer from radiation exposure depends on various factors, including the dose and duration of exposure, the type of radiation, and individual susceptibility. High doses of radiation and repeated exposures over a long period of time are more likely to increase the risk of cancer.
Furthermore, it is worth mentioning that the benefits of medical procedures involving X-rays and gamma rays, such as diagnostic imaging and radiation therapy, generally outweigh the associated risks. Strict safety protocols and regulations are in place to minimize unnecessary exposure to radiation and ensure that the benefits outweigh the potential harm.
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a charge of 0.4623 nc is placed at the center of a cube that measures 8.564 m along each edge. what is the electric flux through one face of the cube? the permittivity of a vacuum is 8.8542 × 10−12 c 2 /n · m2 . answer in units of n · m2 /c.
Answers
Now, we can simplify and calculate the electric flux:
Electric flux = (0.4623 / 8.8542) × (10^−9 / 10^−12) N · m^2 / C
Electric flux =\(52.21 × 10^3 N · m^2 / C\)
Electric flux = \(52.21 × 10^3 N · m^2 / C\)
Therefore, the electric flux through one face of the cube is\(52.21 × 10^3 N · m^2 / C.\)
To calculate the electric flux through one face of the cube, we can use Gauss's law. Gauss's law states that the electric flux through a closed surface is equal to the total charge enclosed divided by the permittivity of a vacuum.
1. Determine the total charge enclosed: In this case, the charge is placed at the center of the cube. Since the cube is symmetrical, the charge is enclosed by one face of the cube. Therefore, the total charge enclosed is 0.4623 nc.
2. Calculate the electric flux: The electric flux is equal to the total charge enclosed divided by the permittivity of a vacuum. The permittivity of a vacuum is given as \(8.8542 × 10^−12 C^2 / (N · m^2).\)
Electric flux = (Total charge enclosed) / (Permittivity of vacuum)
Electric flux = \(0.4623 nc / (8.8542 × 10^−12 C^2 / (N · m\)^2))
To simplify the units, we convert nanocoulombs (nc) to coulombs (C) by dividing by 10^9:
Electric flux\(= (0.4623 × 10^−9 C) / (8.8542 × 10^−12 C^2 / (N · m^2))\)
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Let v = (2, 3, 1), w = (1, 1, 1), and 3u 2v 4w = (1, 2, 3). find (a) the vector u (b) the linear combination: 2u 3v 5w.
Answers
The vector of linear combination = u is -7/3 i - 8/3 j - k , a) linear combination is xi + yj + zk = (1/3) (-7i -8j-3k) b ) linear combination is 19/3 i + 17/3 j + 6 k
The vector u is \(-7/3\) i - \(8/3\) j - k.
The linear combination 2u + 3v + 5w is 19/3 i + 17/3 j + 6k.
in line with the posed question.
v = (2, 3, 1)
w = (1, 1, 1)
And
3u + 2v + 4w = (1, 2, 3)
From,
v = (2, 3, 1)⇒ v = 2i + 3j + 1k
w = (1, 1, 1)⇒ w = I + j + j
Evaluation :
a). Let u be the vector xi + yj + zk.
Here,
3u + 2v + 4w = (1, 2, 3)
I + 2j + 3k = 3u + 2v + 4w
I + 2j + 3k = 3(xi + yj + zk) + 2(2i + 3j + k) + 4(i + j + k)
I + 2j + 3k = 3xi + 3yj + 3zk + 4i + 6j + 2k + 4i + 4j + 4k
I + 2j + 3k = 3xi + 3yj + 3zk + 8i + 10j + 6k
I + 2j + 3k - 8i -10j -6k = 3xi + 3yj + 3zk
-7i -8j -3k = 3xi + 3yj + 3zk
xi + yj + zk = (1/3) (-7i -8j-3k)
b). The linear combination
2u + 3v + 5w
= 2(-7/3i -8/3j - k ) + 3(2i + 3j + k) + 5(i + j + k)
= -14/3 i -16/3j -2k + 6i + 6j + 3k + 5i + 5j + 5k
= -14/3 i -16/3j -2k + 11i + 11j + 8k
= 19/3 i + 17/3 j + 6k
What is a linear combination of a vector?
A linear combination is of two or more vectors in which the vector obtained by adding two or more vectors (with different directions) which are then multiplied by scalar values.
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A ball is projected 125 meters straight upward and then falls the same distance back to its starting point. Neglecting air resistance, its total time in the air is about.
Answers
The ball that is projected 125 meters straight upward has a total time in the air of: 10.1 s
The formulas for the vertical launch upward and the procedures we will use are:
y max = v₀²/(2*g)t max = v₀/ gt(of)=2*t maxWhere:
v₀ = initial velocityg = gravityy max = maximum heightt max = time to reach maximum heightt(of) = time of flightInformation about the problem:
g = 9.8 m/s²y max= 125 mv₀ = ?t max =?t(of) =?Applying the maximum height formula and clearing the initial velocity we get:
y max = v₀²/(2*g)
v₀ = √(y max * (2*g))
v₀ = √( 125 m * (2 * 9.8 m/s²))
v₀ = √( 125 m * 19.6 m/s²)
v₀ = √2450 m²/s²
v₀ = 49.497 m/s
Applying the maximum time formula we get:
t max= v₀ / g
t max= 49.497 m/s / 9.8 m/s²
t max = 5.050 s
Applying the time of flight formula, we get:
t(of) =2 * t max
t(of) =2 * 5.050 s
t(of) = 10.1 s
What is vertical launch upwards?In physics vertical launch upwards is the motion described by an object that has been launched vertically upwards in which the height and the effect of the earth's gravitational force on the launched object are taken into account.
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The time taken now is 10 s
What is the time taken?We know that in this case, the object was projected vertically upward and we know that in this direction the acceleration due to gravity is negative. Then the ball falls straight down to the ground. We have to use the equation of kinematics under gravity to approach the problem.
We now have that;
h = ut + 1/2gt^2
Considering the downward motion were g is positive u = 0 m/s
h = 1/2gt^2
t = 2h/g
t = √2h/g
t = √ 2 * 125/10
t = 5 s
Given that the time taken to go up is the same as the time taken to come down;
Total time spent in air = 2 (5 s) = 10 s
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what do you predict will happen in activity 2-2 when the coil is pulled away from the north pole of magnet
Answers
So, in Activity 2-2, if the coil is pulled away from the north pole of a magnet, it is likely that an EMF will be induced in the coil.
What is EMF?However, based on general principles of electromagnetism, if a coil is pulled away from the north pole of a magnet, it will experience a change in magnetic flux, which can induce an electromotive force (EMF) in the coil. This phenomenon is known as electromagnetic induction.
How is direction of EMF known?The magnitude and direction of the induced EMF will depend on several factors, such as the strength of the magnet, the velocity at which the coil is moved, and the orientation of the coil with respect to the magnetic field. If the coil is part of a circuit, the induced EMF can cause a current to flow in the circuit.
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A bicyclist is finishing his repair of a flat tire when a friend rides by with a constant speed of 3.5 m>s. Two seconds later the bicyclist hops on his bike and accelerates at 2.4 m>s2 until he catches his friend. (a) How much time does it take until he catches his friend
Answers
Answer:
4.28 s
Explanation:
after two seconds (2 s) His friends is
d = 3.5 m/s x 2 s = 7 meter ahead.
in this state, a bicylist start from initial velocity vo = 0 m/s and accelerat 2.4 m/s²
then, when bicylist reach his friend
t friend = t bicyclist = t
d bicylist = d friend + d
-------
d friend = 3.5 . t
d bicylist = vo . t + ½ a t²
d friend + d = vo . t + ½ a t²
3.5 t + 7 = 0 . t + ½ . 2.4 . t²
3.5 t + 7 = 1.2 t²
0 = 1.2 t² - 3.5 t - 7
t = -1.363 and t = 4.28
take the positive one
Which is not a property of covalent solids?
A brittleness
B high melting point
C high lattice energy
Answers
Covalent solids exhibit low melting points and boiling points. Therefore, option B is correct.
What are covalent compounds?In a covalent compound, the covalent bond is formed by the mutual sharing of electrons that can hold all molecules together. Shared electron pairs are difficult to give away as nuclei of two elements together share the electrons therefore these types of bonds are stronger.
A covalent network solid can be described as a chemical compound in which the atoms are bonded by covalent bonds in a continuous network. The covalent solids are generally brittle in nature.
The melting points for covalent solids are generally low while high melting points for ionic solids.
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The three main types of nuclear radiation are alpha, beta, and gamma
Which of the following lists these types of radiation from highest penetrating power to lowest penetrating power?
beta, alpha, gamma
beta, gamma, alpha
ОООО
O gamma, beta, alpha
O alpha, gamma, beta
Answers
Gamma, beta, alpha
Explanation:
Gamma rays have the shortest wavelengths of all electromagnetic radiation, has the greatest penetrating power. Gamma rays can pass completely through the human body; as they pass through, they can cause ionizations that damage tissue and DNA. Then Beta particles are more penetrating than alpha particles, but can be stopped by a thin sheet of aluminum.
The correct order of these types of radiation from highest penetrating power to lowest penetrating power is gamma, beta, and alpha. The correct option is C.
Among gamma, beta, and alpha radiation, gamma radiation has the shortest wavelength. This is because gamma radiation consists of high-energy electromagnetic waves, similar to X-rays and light, but with even shorter wavelengths.
In terms of other properties:
Alpha radiation consists of particles called alpha particles, which are helium nuclei (two protons and two neutrons) that are emitted from the nucleus of an atom during radioactive decay. Alpha particles are relatively large and heavy, and they have a positive charge. They have a short range in air and can be stopped by a piece of paper or human skin, but they can cause significant damage to living tissue if they are inhaled or ingested.
Beta radiation consists of particles called beta particles, which are high-energy electrons or positrons that are emitted from the nucleus of an atom during radioactive decay. Beta particles are smaller and lighter than alpha particles, and they have a negative charge. They have a longer range in air than alpha particles, but they can be stopped by a thin sheet of metal or plastic.
Gamma radiation, as mentioned earlier, consists of high-energy electromagnetic waves. Gamma rays are similar to X-rays but have even higher energies and shorter wavelengths. Gamma rays have the longest range in air and require dense materials, such as lead or concrete, to stop them. Gamma radiation is the most penetrating of the three types of radiation and can cause damage to living tissue if exposure is prolonged.
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A system has a pressure of 5 N/m2
If a force of 2000N is applied, what is the area that the force is applied to?
Give the units.
Answers
400 m2
Explanation:
Pressure = Force ÷ Area
5 N/m2 = 2000 N ÷ A
A = 2000 N ÷ 5
= 400 m2
If a force of 2000N is applied, the area that the force is applied to is 400 m²
What is force?The word "force" has a specific meaning in science. At this level, calling a force a push or a pull is entirely appropriate. A force is not something an object "has in it" or that it "contains."
One thing experiences a force from another. There are both living things and non-living objects in the concept of a force.
The amount of force applied to a certain region is referred to as pressure. The force per unit area is called pressure. F in this condensed version of the equation stands in for the force, which is expressed in newtons.
Given that the pressure of 5 N/m²
Force is 2000N
Pressure = Force ÷ Area
5 N/m² = 2000 N ÷ A
A = 2000 N ÷ 5 = 400 m²
Therefore, the area that the force is applied to is 400 m².
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14. The average speed of a car was 60 m/s by the time it reached the finish line. The car moved in a straight line and traveled from the starting
line to the finish line in 8.0 sec. How far was the finish line?