Answers
Answer:
Assuming the height at which the wrench was dropped is 336 feet,
the person will hear the sound in 0.3 sec and the wrench will hit the ground only after 4.58 seconds so there is enough time to get out of the way
Explanation:
Without knowing the exact height at which the 24th floor is located, it would be difficult to determine whether the wrench will hit the ground before the sound hits the ground
Realistically, we can assume each floor of the building is 14' high
So the height at which the 24th floor is located is 24 x 14 = 336 feet
To travel 336 feet at 1100 feet per second, sound will take 336/1100 seconds which is 0.30 second
Let's compute the time taken for the wrench to hit the ground
The acceleration due to gravity is usually taken to be 16 feet/second²
The displacement which is the distance traveled by an object with an initial velocity of u in time t is given by the equation:
s = ut + (1/2)t²
Here the initial velocity is 0
So the equation is
s = 1/2 x 32 x t² = 16t²
To cover 336 feet we substitute 336 for s and get
336 = 16t²
t² = 336/16
t = ±√(336/16) ≈ 4.58 seconds (we only take the positive root)
So the person will hear the sound in 0.3 sec and the wrench will hit the ground only after 4.58 seconds so there is enough time to get out of the way
In general, we can state that if the height from which the wrench was dropped is h then time t taken for wrench too hit the ground is
t = √(h/16) seconds
If this is greater than the time taken for sound to travel the same distance then the person can get out of the way
Related Questions
can a body have an east velocity while expressing westward acceleration
Answers
Yes it can, an object can be moving a certain direction while the ACCELERATION is in the opposite direction.
Lets say your riding a bike... if your squeezing your handle bar breaks, the acceleration of the bike would be pushing in the opposite direction of the direction the bike is moving.
Hope this helped!
A plane is landing at an airport. The plane has a massive amount of kinetic energy due to it's motion. When the plane lands, it activates its brakes, causing it to slow down and eventually stop. The kinetic energy that the plane had is now gone. In keeping with the Law of Conservation of Energy, which of the following is the most likely explanation of what happened to that energy?
A. The brakes used a coil system to convert the kinetic energy into potential energy stored in the brakes
B. The kinetic energy of the plane gets pushed into the air in front of it due to drag forces, causing the air to move, thus transferring the kinetic energy from the plane to the air
C. The brakes create friction, which transformed the kinetic energy to heat energy that was dissipated to the surroundings
D. The kinetic energy is being converted into sound energy by the loud engines of the plane
Answers
Answer:
A. The brakes used a coil system to convert the kinetic energy into potential energy stored in the brakes
Explanation:
Based on the law of conservation of energy, the brakes used a coil system to convert the kinetic energy into potential energy stored in the brakes.
The law of conservation of energy states that energy is neither created nor destroyed in a system but it is transformed from one form to another.
As the airplane slows down, the kinetic energy which is presented in the motion of the plane is gradually converted to potential energy.
The potential energy is the energy due to the position of a body.
Why would you want to slow down the movement of heat?
Answers
Answer: heat is transferred to and from objects -- such as you and your home -- via three processes: conduction, radiation, and convection.
Explanation:
Hopes this helps!
Why is a frame of reference important in Physics?
Answers
Answer:
A “frame of reference” is a standard relative to which motion and rest may be measured; any set of points or objects that are at rest relative to one another enables us, in principle, to describe the relative motions of bodies.
Explanation:
When you see a ball roll down a street, you can tell the ball is moving because the frame of reference is the streets, whatever may be on the side of the roads, or the Earth. All of these are frames of reference. All measurements of motion will be compared to a frame of reference.
3. A car with a mass of 1600 kg has a kinetic energy of 125 000 J. How fast is it moving?
Answers
The car is moving at approximately 12.5 meters per second.
The kinetic energy (KE) of an object can be calculated using the formula:
KE = 1/2 * m * \(v^2\)
where
KE = kinetic energy,
m =Mass of the object, and
v = velocity.
In this case, we are given the mass (m) of the car as 1600 kg and the kinetic energy (KE) as 125,000 J. To find the velocity .
Substituting the values , we have:
125,000 J = 1/2 * 1600 kg *\(v^2\)
Now, we can solve for v by rearranging the equation:
\(v^2\) = (2 * 125,000 J) / 1600 kg
\(v^2\) = 156.25 \(m^2/s^2\)
Taking the square root, we find:
v = √156.25\(m^2/s^2\)
v ≈ 12.5 m/s
Therefore, the car is moving at approximately 12.5 meters per second.
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A main difference between asteroids and comets is that asteroids are mostly made of rock and comets are mostly made of metals carbon compounds ice vapor (gas) you can't fool me, astronomers don't really know what comets are made of
Answers
We can confirm that the difference between a comet and an asteroid lies in their compositions and physical characteristics derived from those compositions.
As stated in the question, the main difference between an asteroid and a comet is their compositions, meaning the materials from which they form.
Asteroids are rocky objects which a heavy metal composition, while comets tend to be made of dust, ice, and some rocky material. Some extra differences include:
Comets reflect a steady amount of light (because of their ice composition)Asteroids will reflect light at random intervals due to some metals that may be present on their surfaceComets tend to have a tail made of water from the melting ice when reflecting sunlight.Therefore, we can confirm that the main difference between asteroids and comets is their compositions, which lead to distinct physical characteristics.
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Read the scientific question below. "Is air pollution related to lichen growth?" What is a likely hypothesis for the question?
Answers
Answer:
Long distance transport of nitrogenous air pollution is important and people who drive are influencing the occurrence of acidic loving lichen species
Explanation:
Can someone please explain why the answer to this net torque question is +115 Nm
Answers
Answer:
Net torque in positive direction:
Fz = -450 * cos 30 deg * 1.5 = -585 N-M
Fz = 200 * 3.5 = 700 N-M
Net F = 115 N-M
Torque is generally defined as L = R X F
X cross Y = Z normal coordinate system
Note that Z will be out of the page giving the positive value for the torque.
What is my acceleration when I travel at a constant speed of 10 m/s for 50 seconds on a straight street?
Answers
Answer:
there is no acceleration
Explanation:
acceleration only occurs when the speed changes for example if you were to start at 10m/s and after ten seconds be at 50m/s then there would be acceleration but because speed is constant there is no acceleration
What does your ecological foot print tell you?
Answers
Answer:
How big your foot is. (Big Brain)
Explanation:
what is the value of pi(8.104)^2 written with correct significant numbers
Answers
Answer:206.3
Explanation:
I’ve been struggling with this question, help!
Answers
The masses of the two objects MA and MB in the binary system are 4 Mo respectively.
How can the masses of the binary systems be calculated?The masses of binary systems can be calculated using Kepler's laws of planetary motion and observations of the system.
Let's denote the masses of the two objects as MA and MB, where MA is the mass of object A and MB is the mass of object B. We know that the total mass of the binary system is 8 Mo, so:
MA + MB = 8 Mo
We also know that the ratio of the distances between the two objects is 1/3. Let's denote the distance between the two objects as d, so we have:
d(A to B) / d(Binary System) = 1/3
We can simplify this equation by using the fact that the distances between the objects and the binary system add up to the total distance between the objects:
d(A to B) + d(B to binary system) = d(Binary system)
Since we know the ratio of the distances, we can substitute 1/3d for d(B to binary system):
d(A to B) + 1/3d = d(Binary system)
3d(A to B) + d = 3d(Binary system)
Substituting d(A to B) for d(Binary system) - d(B to binary system), we get:
3d(A to B) + d = 3(d(A to B) + d(B to binary system))
2d(A to B) = 2d(B to binary system)
d(A to B) / d(B to binary system) = 1
So the two objects are at the same distance from the binary system center of mass. This means that the masses of the two objects are equal:
MA = MB
Substituting this into the first equation, we get:
2MA = 8 Mo
MA = MB = 4 Mo
Therefore, the mass of each object is 4 Mo.
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A nano-satellite has the shape of a disk of radius 0.80 m and mass 8.50 kg.
The satellite has four navigation rockets equally spaced along its edge. Two
navigation rockets on opposite sides of the disk fire in opposite directions
to spin up the satellite from zero angular velocity to 14.5 radians/s in 30.0
seconds. If the rockets each exert their force tangent to the edge of the
satellite (the angle theta between the force and the radial line is 90
degrees), what was is the force of EACH rocket, assuming they exert the
same magnitude force on the satellite?
Answers
Answer:
Explanation:
moment of inertia of satellite I = 1/2 m R²
m is mass and R is radius of the disc
I = 0.5 x 8.5 x 0.8²
= 2.72 kg m²
angular acceleration α = change in angular velocity / time
α = (14.5 - 0) / 30
α = .48333
Let force of each rocket = F
torque created by one rocket = F x R
= F x .8
Torque created by 4 rockets = 4 x .8 F = 3.2 F
3.2 F = I x α
3.2 F = 2.72 x .48333
F = 0 .41 N
03: Hook's law suggests that F is directly proportional to -x, how much true you have found this statement in your experiment? Explain any differences.
Answers
Hooke's Law can be given as follows sometimes:
The restoring force of a spring is equal to the spring constant multiplied by the displacement from its normal position:
F = -kx
Where, F = Restoring force of a spring (Newtons, N)
k = Spring constant (N/m)
x = Displacement of the spring (m)
The negative sign relates to the direction of the applied force and by convention, the minus or negative sign is present in F = -kx. The restoring force F is directly proportional to the displacement (x), according to Hooke's law. When the spring is compressed, the displacement (x) is negative. It is zero when the spring is at its original length and positive when the spring is extended.
Practically, Hooke's Law is applicable only within a limited frame of reference, and through experimenting, this statement proves to be true. Because materials cannot be compressed beyond a certain size or expanded beyond a certain size without some permanent deformation or change of their original state.
The law only applies under some conditions such as a limited amount of force or deformation. Factually, many materials will noticeably deviate from Hooke's law even before those elastic limits are reached.
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A body of mass 80kg moving with a velocity of 6m/s hits a stationary body
of mass of 40kg. If the two bodies stick after the impact, calculate their
common velocity.
Answers
Answer:
4 m/s
Explanation:
Conservation of momentum , mv
Before collision 80 kg * 6 m/s = 480 kg-m/s
after the collision,
the momentum is the same but the mass is 80+40 kg =120 kg
mv = 480
120 * v = 480
v = 4 m/s
is that true or false center of mass the point at which all the mass of an object may be consider to be concentrated
Answers
The statement is true, in most scenarios the center of mass can be thought ofa point where all the mass is concentrated.
Is the statement true or false?The center of mass of an object is the point at which the entire mass of the object can be considered to be concentrated. It is the point where the object's total mass is evenly distributed in all directions, and the object would balance if supported at that point.
The center of mass is a useful concept in physics and engineering for analyzing the motion and stability of objects, as it simplifies the complex distribution of mass into a single point.
so the statement is true.
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How could a change in straight line motion due to unbalanced forces be predicted from an understanding of inertia?
Answers
Answer:
If the force goes in the direction of movement, the speed must increase and if the net force goes in the opposite direction, the speed must decrease.
Explanation:
The principle of inertia or Newton's first law states that every body remains static or with constant velocity if there is no net force acting on it.
Based on this principle, if we have a net force, the velocity of the body changes by having an unbalanced force acting.
If the force goes in the direction of movement, the speed must increase and if the net force goes in the opposite direction, the speed must decrease.
g 2. In a laboratory experiment on standing waves a string 3.0 ft long is attached to the prong of an electrically driven tuning fork which vibrates perpendicular to the length of the string at a frequency of 60 Hz. The weight (not mass) of the string is 0.096 lb. a) [5 pts] What tension must the string be under (weights are attached to the other end) if it is to vibrate in four loops
Answers
Answer:
The tension in string will be "3.62 N".
Explanation:
The given values are:
Length of string:
l = 3 ft
or,
= 0.9144 m
frequency,
f = 60 Hz
Weight,
= 0.096 lb
or,
= 0.0435 kgm/s²
Now,
The mass will be:
= \(\frac{0.0435}{9.8}\)
= \(0.0044 \ kg\)
As we know,
⇒ \(\lambda=\frac{2L}{n}\)
On substituting the values, we get
⇒ \(=\frac{2\times 0.9144}{4}\)
⇒ \(=0.4572 \ m\)
or,
⇒ \(v=f \lambda\)
⇒ \(=0.4572\times 60\)
⇒ \(=27.432 \ m/s\)
Now,
⇒ \(v=\sqrt{\frac{T}{\mu} }\)
or,
⇒ \(T=\frac{m}{l}\times v^2\)
On putting the above given values, we get
⇒ \(=\frac{0.0044}{0.9144}\times (27.432)^2\)
⇒ \(=\frac{752.51\times 0.0044}{0.9144}\)
⇒ \(=3.62 \ N\)
if up is up and down is down isn't downside up , upside down
Answers
Answer:
No they arent because they are opposite to each other.
Following a collision between a large spacecraft and an asteroid, a copper disk of radius 28.0 m and thickness 1.20 m, at a temperature of 850°C, is floating in space, rotating about its axis with an angular speed of 20.0 rad/s. As the disk radiates infrared light, its temperature falls to 20.0°C. No external torque acts on the disk.
A) Find the change in kinetic energy of the disk.
B) Find the change in internal energy of the disk.
C) Find the amount of energy it radiates.
Answers
Answer:
A. 9.31 x10^10J
B. -8.47x10 ^ 12J
C. 8.38x 10^12J
Explanation:
See attached file pls
9. A mass is supported on frictionless smooth horizontal surface. It is attached to a string rotated about a fixed centre at an angular velocity . If the length of the string and the angular velocity are doubled (the initial tension is T), then what will be the new tension of the string? [Hint: answer must be in terms of T].
10. An automobile, whose speed is increasing at a rate of 0.6 m /s², travels along a circular road of radius 20m. What will be automobile's angular acceleration when its instantaneous speed of the automobile is 4 m/s?
Answers
9. The new tension in the string (T') is 8 times the initial tension (T).
10. The angular acceleration of the automobile when its instantaneous speed is 4 m/s is -0.77 rad/s².
How to calculate the value9. Initially, the tension in the string (T) provides the necessary centripetal force, so we have:
T = m * ω₁² * r
After doubling the length and angular velocity, the new tension in the string (T') should provide the centripetal force, so we have:
T' = m * ω₂² * (2r)
Since the length and angular velocity are doubled, we can write:
ω₂ = 2 * ω₁
Substituting this into the equation for T', we get:
T' = m * (2 * ω₁)² * (2r)
= 4 * m * ω₁² * (2r)
= 8 * (m * ω₁² * r)
= 8 * T
Therefore, the new tension in the string (T') is 8 times the initial tension (T).
10. The linear acceleration of an object moving in a circle of radius r with an angular velocity ω can be found using the formula:
a = ω² * r
Differentiating this equation with respect to time gives:
dv/dt = d(ωr)/dt
= ω * dr/dt + r * dω/dt
= ω * v + r * α
Given that the speed of the automobile is increasing at a rate of 0.6 m/s², we can substitute the values into the equation:
0.6 = ω * 4 + 20 * α
Since the instantaneous speed is 4 m/s, we can set ω = 4, and solve for α:
0.6 = 4 * 4 + 20 * α
0.6 = 16 + 20 * α
0.6 - 16 = 20 * α
-15.4 = 20 * α
α = -15.4 / 20
α = -0.77 rad/s²
Therefore, the angular acceleration of the automobile when its instantaneous speed is 4 m/s is -0.77 rad/s².
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Hunter designs two flags for his adventure club. What is the length of the base, x, of the larger flag? enter your answer, as a decimal, in the box. X = ft.
Answers
The required length of the base of larger flag when other sides are specified is calculated to be 6.25 ft.
The given two triangles are the flags of two different sizes. The lengths of various sides are specified.
The length of the base of the larger flag is to be found out.
The given two angles in small flag are equal to the corresponding angles in the large flag.
Two flags are the similar triangles as they look proportionate.
Both triangles' edges are proportional to one another.
So, from the figure, 4/5 = 5/x
x = 25/4 = 6.25 ft
Thus, the required x on the base of bigger flag is 6.25 ft
The given question is incomplete. The figure is missing. It is attached in the figure below.
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A sample of 4 mol of diatomic gas is measured to have a temperature of 290 K. If the mass of the gas is 0.064 kg, what is the approximate average speed of the molecules in the gas? (Recall that the equation for kinetic energy due to translation in a gas is KEtranslational - 1 3 nRT, and R = 8.31 J/(mol. 2 2. K).) mv2A. 599 m/sB. 672 m/sC. 643 m/sD. 699 m/s
Answers
Given
Number of moles, n=4 mol
The temperature is T=290K
Mass of the gas, m=0.064 kg
Universal gas constant, R=8.31 J/mol.K
To find
The average speed of the molecule
Explanation
The average speed is given by
\(\begin{gathered} v=\sqrt{\frac{3nRT}{m}} \\ \Rightarrow v=\sqrt{\frac{3\times4\times8.31\times290}{0.064}} \\ \Rightarrow v=672.19\text{ m/s} \end{gathered}\)Conclusion
The average speed is B. 672 m/s
some snakes have special sense organs that allow them to see the heat emitted from warm blooded animals what kind of an electromagnetic waves does the sense organs detect?
A. Visible light waves
B. Ultraviolet light waves
C. Infrared Waves
D. Microwaves
Answers
The heat emitted from anything is carried in the form of infrared waves. (C)
Given the list of items, select all that are considered to be matter:
music
heat
air
dreams
water
gasoline
love
bacteria
thoughts
Answers
From the given list of items, examples of matter include, heat, air, water, gasoline, and bacteria.
What is matter?Matter is a substance made up of various types of particles that occupies physical space and has inertia.
A matter must have mass and occupy space.
Examples of matter include the following;
heatairwatergasolinebacteriaThus, from the given list of items, examples of matter include, heat, air, water, gasoline, and bacteria.
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These are all different questions. (Physics)
A: If a 2,000 kilograms truck is moving at 35 m/s, what is its momentum?
B: An impulse of 24 Ns acts on a baseball from a bat. What is the force applied to the ball from bat if the ball is in contact with the ball for only 0.0007s.
C: An 8 kilogram bowling ball is rolling in a straight line toward you. If its momentum is 16 kg·m/sec, how fast is it traveling?
D: A beach ball is rolling in a straight line toward you at a speed of 0.5 m/s. Its momentum is 0.25 kg·m/sec. What is the mass of the beach ball?
Answers
The momentum of truck is 70,000kg.m/s
Newtonian mechanics, the linear momentum is the product of the mass and velocity of an object. It is a vector quantity, having a magnitude and a direction. If m is an object's mass and v is its velocity, then the object's momentum p is given as,
p = mv
We are given here,
Mass of the truck = m = 2000kg
Velocity of the truck = v = 35m/s
Therefore , to get the value of momentum p using the above equation ,
p = (2000kg) × (35m/s)
p = 70000 kg. m/s
Thus , the momentum of the truck can be given as 70,000kg.m/s
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OFFERING 80+ POINTS!!!!!!!!!
Three small spheres, A, B, and C, have charges with magnitudes qA, qB, and qC, respectively.The three spheres are aligned along a straight line, as shown in the figure. At the instant shown, the net force on sphere A is zero.:
1. Which of the following statements must be true of the signs of the charges?
a. Only charges qA and qB have the same sign.
b. Only charges qA and qC have the same sign.
c. Only charges qB and qC have the same sign.
d. Charges qB and qC have different signs.
e. Charges qA, qB, and qC all have the same sign.
2. The ratio qC/qB is...
a. 9/4
b. 1/1
c. 4/9
d. 1/4
e. 1/9
3. Which of the following is true about the sign of charge qA?
a. The sign of charge qA must be the same as that of qB.
b. The sign of charge qA must be the same as that of qC.
c. The sign of charge qA must be the same as that of either qB or qC greater magnitude.
d. The sign of charge qA must be the same as that of either qB or qC lesser magnitude.
e. It is possible that qA could be either positive or negative.
OFFERING A LOT OF POINTS FOR ANSWERS AND EXPLANATIONS TO ALL THREE!!
Answers
1. Charges qB and qC have different signs.
2. The ratio qC/qB is 9/4.
3. The sign of charge qA must be the same as that of either qB or qC lesser magnitude.
What is electric force?Electric force is the attracting or repulsive interaction between any two charged things. Similar to any force, Newton's laws of motion describe how it affects the target body and how it does so.
1. As net force on qA is zero, charges qB and qC have different signs.
2. The ratio qC/qB is = (3d)²/(2d)² = 9/4.
3. As the net force on qA is zero, the sign of charge qA must be the same as that of either qB or qC lesser magnitude.
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Describe the best way to identify the constellation Cassiopeia.
Please hurry!
I am giving Brainlyist
And to points
Answers
Answer:
look for the "W" in the North. Remember that, the "W" may be on its side or inverted to form an "M." If you can recognize the Big Dipper (Ursa Major), the two stars at the edge of the Dipper point toward the North Star (Polaris)
Explanation:
If two balls are dropped from the same height, but one has four times the mass of the other when reaching the floor the ball with the four times the mass will have only half the speed of the other (disregard the air resistance).TrueFalse
Answers
False
Explanation
A free falling object is an object that is falling under the sole influence of gravity.
Step 1
a) Diagram
Step 2
now, for the free fall with have the formula
\(\begin{gathered} v_f=v_i+at \\ where \\ v_fi\text{s the final velocity} \\ v_{i\text{ }}\text{ is the initial velocity} \\ \text{t is the time} \end{gathered}\)we can see that in the formula there is not mass, so the final velocity does not depend on the mass ,it depends on the initial velocity , the time and the acceleration of gravity, ( also the heigth), so both balls will have the same final velocity, therefore
False
I hope this helps you
To review the solution to a similar problem, consult Interactive Solution 1.43. The magnitude of a force vector is 87.4 newtons (N). The x component of this vector is directed along the x axis and has a magnitude of 72.1 N. The y component points along the y axis. (a) Find the angle between and the x axis. (b) Find the component of along the y axis.
Answers
Answer:
(a) 34.4°
(b) 49.4 N
Explanation:
(a) From the diagram,
Amgle between the x axis can be calculated as,
cosΘ = adjacent/hypoteneous
cosΘ = 72.1/87.4
cosΘ = 0.8249
Θ = cos⁻¹(0.8249)
Θ = 34.4°.
Hence the angle between the x axis is 34.4°
(b) To find the component along the y axis we make use of pythagoras theorem.
a² = b²+c²................... Equation 1
Where a = 87.4 N, b = 72.1 N, c = y.
Substitute these values into equation 1
87.4² = 72.1² + y²
y² = 87.4²-72.1²
y² = 2440.35
y = √(2440.35)
y = 49.4 N
