2 years ago

A roller coaster pushes a 25 kg person upward with a force of 300 N. What is the acceleration?

Physics

1 answer:

vlada-n [284]2 years ago

8 0

300N/25 kg= divide them for the answer

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The roller coaster is designed according to safety regulations that prohibit the speed of the car from exceeding 20 m/s. find th

hram777 [196]

maximum allowed value of the speed in roller coaster is given as

$v = 20 m/s$

now from kinematics we can say

$v^2 - v_i^2 = 2 a s$

here initial speed will be

$v_i = 0$

acceleration is due to gravity

$a = 9.8 m/s^2$

now we can use this to find the height

$20^2 - 0^2 = 2 * 9.8* h$

$400 = 19.6 *h$

$h = 20.4 m$

so maximum allowed height will be 20.4 m

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2 years ago

In a particular experiment to study the photoelectric effect, the frequency of the incident light and the temperature of the met

qwelly [4]

Answer:

B. The number of electrons emitted from the metal per second increases.

Explanation:

Light consists of photons . Energy of each photon depends upon frequency of light . The increase in intensity increases the number of photons . It does not increase energy of photons .

So if a high intensity light falls on a photosensitive plate , each photon ejects one electron . So number of electrons increases if we increase intensity of photon. It does not increase kinetic energy of ejected electrons . Work function depends upon the nature of plate.

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2 years ago

A cricket starts at the 5 meter mark on a ruler. It jumps to the 10 meter mark. Then, it jumps back to the 6 meter mark. Calcula

belka [17]

We have that the cricket’s displacement is

$D_t=9meters$

From the Question we are told that

Start position 5 meter mark

It jumps to the 10 meter mark.

it jumps back to the 6 meter mark.

Generally the equation for cricket’s displacement. is mathematically given as

$D_t=Initial +final(displacement)\\\\D_t=(10-5)+(10-6)$

$D_t=9meters$

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2 years ago

What is the mass defect of lithium? Assume the following: Atomic number of lithium = 3 Atomic mass of lithium = 7.0144 atomic ma

Mice21 [21]

3 protons x 1.0073amu = 3.022 
4 neutrons x 1.0087amu = 4.035 

mass = 7.0567amu 
mass defect = 7.0567 - 7.0144 = 0.0423amu.....B with your mass of Li

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2 years ago

if you can build a cyclotron with twice the radius, by what factor would the allowed maximum particle energy increase? assume th

mina [271]

B. 4

That's the correct answer

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2 years ago