A physicist wants to measure the force required to push a heavy box up a ramp. What tools might the physicist use? What measurements should the physicist take?

Answer:

a. 1000N/C

Explanation:

Data mentioned in the question

Electrical field magnitude = 1000 NC

Perpendicular distance = 0.1 m

Perpendicular distance = 0.2 m

Based on the above information, the electric field is

As we know that

\(E = \frac{\sigma}{2\times E_o}\)

where,

\(\sigma\) = surface charge density

E = distance from nearby point to sheet i.e be independent

The distance at 0.1 and 0.2, the electric field would remain the same

So,

Based on the above explanation, the first option is correct

a) Velocity of basketball player when he leaves the floor is 6.64 m/s ;  b) Acceleration while basketball player is straightening his legs is 73.8 m/s² ; c) Basketball player exerts a force of 8118 N on the floor to jump up for the ball.

Acceleration is the rate of change of velocity, while velocity is the rate of change of displacement.

(a) m g h = (1/2)mv²

m is player's mass, g is acceleration due to gravity, h is initial height, v is velocity when the player leaves the floor.

(110 kg)(9.81 m/s²)(0.300 m) = (1/2)(110 kg)(v²) + (110 kg)(9.81 m/s²)(0.900 m)

v = 6.64 m/s

So, velocity of basketball player when he leaves the floor is 6.64 m/s.

(b) v² = u² + 2as

u is initial velocity (zero in this case), a is acceleration, s is distance traveled, and v is the final velocity (6.64 m/s in this case).

(6.64 m/s)² = 2a(0.300 m)

a = 73.8 m/s²

Therefore,  acceleration while the basketball player is straightening his legs is 73.8 m/s²

(c) F = ma

F : force, m is the player's mass, and a is the acceleration.

F = (110 kg)(73.8 m/s²)

F = 8118 N

Therefore, basketball player exerts a force of 8118 N on the floor to jump up for the ball.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: A basketball player jumps straight up for a ball. To do this, he lowers his body 0.300 m and then accelerates through this distance by forcefully straightening his legs. This player leaves the floor with a vertical velocity sufficient to carry him 0.900 m above the floor. (a) Calculate his velocity when he leaves the floor. (b) Calculate his acceleration while he is straightening his legs. He goes from zero to the velocity found in part (a) in a distance of 0.300 m. (c) Calculate the force he exerts on the floor to do this, given that his mass is 110 kg.

Answer:

Frequency of the wave = 2 x 10³ hz

Explanation:

Given:

Velocity of wave = 5 x 10⁴

Wavelength = 2.5 x 10¹

Find:

Frequency of the wave

Computation:

Frequency of the wave = Velocity of wave / Wavelength

Frequency of the wave = [5 x 10⁴] / [2.5 x 10¹]

Frequency of the wave = 2 x 10³ hz

The frequency of a wave traveling at 5.00 x 10⁴ meters per second and a wavelength of 2.50x10¹ meters is 2 × 10³ Hz

HOW TO CALCULATE FREQUENCY:

λ = v/f

Where,

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We know

\(\boxed{\sf m=-\dfrac{v}{u}}\)

\(\\ \sf\longmapsto 3=-\dfrac{-40}{u}\)

\(\\ \sf\longmapsto 3=\dfrac{40}{u}\)

\(\\ \sf\longmapsto u=\dfrac{40}{3}\)

\(\\ \sf\longmapsto u=13.3cm\)

Answer:

hot tub is hot

Explanation:

dont get fried

Answer:

false.

Explanation:

Since temperature and kinetic energy of molecules are proportional, the more we increase the temperature of the solvent, the faster the solute will dissolve.

This increase of kinetic energy allows the solvent molecules to more effective break apart the solvent molecules that are held together by intermolecular forces.

Answer: C. all expected frequencies is greater than or equals5

Explanation: The goodness of fit test is mainly used to test if sample data fits a distribution from a certain population.

The expected value for each cell needs to be at least five in order for you to use this test, Not less than 5, but greater than 5. Which is why option C is correct for performing a goodness-of-fit test.

Other requirements includes;

• The sampling method is a simple random sampling.

• The variable under study is categorical.

The main requirement  to perform a​ goodness-of-fit test in the given scenario is that the all expected frequencies is greater than or equals 5. Option C is correct.

Goodness of fit test:

It is a statistical hypothesis test mainly used to test how well a sample data fits a distribution from a certain population.

The expected value of each variable needs to be at least five in order to use this test, Not less than 5, but value can be greater than 5.

Other requirements are,  

The sampling method must be random sampling.  

The variable under study must be categorical.

Therefore, the main requirement  to perform a​ goodness-of-fit test in the given scenario is that the all expected frequencies is greater than or equals 5.

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The given information are not enough to determine the photoelectric current density

From the question, we have the following parameters that can be used in our computation:

The photoelectric current density can be calculated using:

J = n * e / t

Where

From the question, we do not have value for (η)

Hence, the photoelectric current density cannot be calculated

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Tensional faults—normal faults—cause each geologic feature, whereas shear faults—strike–slip faults—cause the remaining three.

The hanging wall, also known as the headwall or footwall, is the higher or overlaying block along the fault plane as rocks slide past one another during faulting. The footwall is the lower block.

A typical fault occurs when the rocks above the fault plane, also known as the hanging wall or footwall, move downward in relation to the rocks below the fault plane, or the footwall. A reverse fault occurs when the footwall slides up relative to the hanging wall.

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The radius of the wheel is 0.102 m.

The radius of a circle is a straight line that comes from the center of a circle to any point of the circumference of the circle.

To calculate the radius of 5 revolutions of the wheel, we use the formula below.

Formula:

Where:

Make r the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, the radius of the wheel is 0.102 m.

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Answer:

B: False

Explanation:

The second law of thermodynamics states that: the entropy of an isolated system will never decrease because isolated systems always tend to evolve towards thermodynamic equilibrium which is a state with maximum entropy.

Thus, it means that the entropy change will always be positive.

Therefore, the given statement in the question is false.

The level within a capillary tube with a radius of 0.45 mm rises to a height of 3 cm above the water's surface when submerged in it.

When water saturation decreases, Pnw outside the pore throat is larger than Pw within the pore throat, resulting in a positive pressure (Pc=PnwPw), which is the definition of capillary pressure.

A micron is equal to 0.001 mm in diameter, therefore the capillaries are just big enough for red blood cells to travel through in a single line. Endothelial cells, which also make up the smooth channel surface of the bigger vessels, are the single layer of cells that make up their walls.

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The Total work done = work done on the object + work done on the cable

From the given information,

weight of the object is = 1500 N

weight of rope is = 3N per m

height interval is = 0 to 40 m

Work = force x distance

If distance = x, then, we have the integral below as shown in the image:

By substituting x = 40 and x = 0, it becomes

1620(40) - 3/2 * (40)^2 - 1620(0) - 3/2 * (0)^2

= 64800 - 2400

= 62400 Nm

the work done from the ground to the top of the building is 62400 Nm

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Hi there!

We can use the equation:

v = at, where in this instance:

v = velocity (m/s)

a = acceleration due to gravity (m/s²)

t = time (s)

g ≈ 9.8 m/s², so:

v = 9.8(3) = 29.4 m/s

Answer:

Earth Day is observed globally

Explanation:

Let the circumference of the circle be 10L.

A moves at 10L/2 = 5L per hour

B moves at 10L/5 = 2L per hour

Therefore it takes 10L/(5L+2L) = 10/7 hours

I'm the youngest rapper in brooklyn, yeah yeah

Answer: el pepe

Explanation:

Answer:

8125 N.

Explanation:

F = M A

M is mass

A is acceleration

F = 65 X 25

F = 8125 N.

Refraction can be defined as a phenomenon describing a change (bend) in the path taken by light.

Refraction refers to a phenomenon which describes a change (bend) in the path taken by light when it comes in contact with surfaces between different transparent materials.

According to the model of light wave, the refraction of light is inversely proportional to its wavelength.

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Refraction is a physical phenomenon in which the the light (it also happens with sound, water and other waves)  while moving from one transparent medium to other, gets deflected or bent from its original straight line path.

This occurs because of the variation in the velocity of the waves differs from medium to medium. The speed of the waves are greater in the denser medium, while their speed is slower in the rarer medium.  

This is defined by the refractive index (n). It is the measurement of the degree of refraction in a particular medium. Refractive index is the ratio of the speed of light in the vacuum and the speed of the light in given phase.

n=c/v . Here 'n' represents the refractive index,  'c' means velocity of light in vacuum and 'v' is the velocity of light in a given medium. It is for the same reason that when we drop a coin in a bucket full of water, it appears closer that its actual distance.

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Answer:

I would say the answer is All the above.

Explanation:

If this wasn't what you were looking for please don't hesitate to comment again! Have a nice day/night! :)

Answer:

all the above

Explanation:

Hi there!

Recall Newton's Law of Universal Gravitation:

\(\large\boxed{F_g = G\frac{m_1m_2}{r^2}}\)

Where:

Fg = Force of gravity (N)

G = Gravitational Constant

m1, m2 = masses of objects (kg)

r = distance between objects (m)

Plug in the given values stated in the problem:

\(F_g = (6.673*10^{-11})\frac{50 * 50}{25^2} = \boxed{2.669 * 10^{-10} N}\)

Answer:

(a) The dc value is 95.5 volts

(b) The rms value is 106.1 volts

(c) The period is 0.01s

Explanation:

Given

\(V(t) = 150\sin(wt)\)

\(f = 100Hz\)

Solving (a): The dc value

\(V(t) = 150\sin(wt)\) implies that

\(V_{max} = 150\)

So, the dc value is:

\(V = \frac{2}{\pi} * V_{max}\)

\(V = \frac{2}{\pi} * 150\)

\(V = \frac{300}{\pi}\)

\(V = 95.5V\)

Solving (b): The RMS value

This is calculated as:

\(V_{rms} = \frac{1}{\sqrt 2} * V_{max}\)

So, we have:

\(V_{rms} = \frac{1}{\sqrt 2} * 150\)

\(V_{rms} = \frac{150}{\sqrt 2}\)

\(V_{rms} = 106.1V\\\)

Solving (c): The period

This is calculated as:

\(T = \frac{1}{f}\)

So, we have:

\(T = \frac{1}{100Hz}\)

\(T = 0.01s\)

Answer:

Cell surface.

Nucleus

Cytoplasm

The function is not continuous at x=1, so the answer is A.

At x=1, the two pieces of the function meet. The first piece ends with an open dot at (1,0), meaning that the function is not defined at $x=1$. The second piece starts with a closed dot at (1,-1), meaning that the function is defined at x=1 and takes the value -1 there.

Since the function is not defined at x=1, it cannot be continuous at that point. Therefore, the function is not continuous overall.

The iron nail didn't attract the paper clip because the domains of the two objects doesnot alligned.

A substance or thing that creates a magnetic field is called a magnet. The most noteworthy characteristic of a magnet, a force that pulls on other ferromagnetic elements like iron, steel, nickel, cobalt, etc., as well as the ability to attract or repel other magnets, is caused by this invisible magnetic field.

There are north and south poles on every magnet. The same poles resist one another whereas opposite poles are drawn to one another. The north-seeking poles of the iron's atoms line up in the same direction when it is rubbed against a magnet. A magnetic field is produced by the force that the aligned atoms produce.

The magnet's primary attributes are as follows:

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Volume air = 1700 L(7.50 ⋅ 10^−4 K ^− 1 − 3 ⋅ 1.20 ⋅ 10^−5 K^−1) ⋅ 9 K ≈ 10.9L

Volume is a measurement of three-dimensional space that is occupied. [1] Numerous imperial units or SI-derived units, such as the cubic metre and litre, are frequently used to quantify it numerically (such as the gallon, quart, cubic inch). Volume and length (cubed) have a symbiotic relationship. The volume of a container is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the amount of fluid (liquid or gas) that the container may hold.

Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes. If a formula for the shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes. Nothing in the dimensions of zero, one, or two has volume.

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Explanation:

Sorry but I don't Understand question

Answer:8.0 m/s^2

Explanation: The ball is traveling in uniform circular motion at the speed of 2 m/s in a path of the radius that is 0.50 meters.

v^2/r

2.0 m/s^2/ 0.50 m= 8.0 m/s^2

The magnitude of the ball's centripetal  acceleration is \(\rm 8 \;m/sec^2\) and this can be determined by using the formula of the centripetal  acceleration.

Given :

A ball attached to a string is whirled at a constant speed of 2.0 meters per second in a horizontal circle of a radius of 0.50 meters.

The following steps can be used in order to determine the magnitude of the ball's centripetal  acceleration:

Step 1 - The formula of the centripetal acceleration can be used in order to determine the magnitude of the ball's centripetal  acceleration.

Step 2 - The formula of the centripetal acceleration is given below:

\(\rm a_c=\dfrac{v^2}{r}\)

Step 3 - Substitute the values of the known terms in the above formula.

\(\rm a_c=\dfrac{2^2}{0.5}\)

Step 4 - Simplify the above expression.

\(\rm a_c = 8\;m/sec^2\)

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Answer:

The first layer is the crust a very thin layer compared to any other

the second layer is the mantal there is 2 parts to the matal there is a solid mental and a hard mental

the last part is the core the most dense part of earth

Explanation: