Mechanics | Relativity Answers

A learner mass(75 kg) is standing next to the road and sees a stationary car (mass 25kgl in front of her.she decides to run towards the car and jump on it and roll down the street.The learner accelerates at a constant acceleration of 2m/s calculate the car'a velocity just after the learner jumped on it

A block of m1=20.0 kg is placed on a plane incline at angle

α=37.1° and is connected to a second hanging block with mass

m2 by a cord passing over a small, frictionless pulley. The

coefficient of kinetic friction between the plane and the block is

0.30.

The brakes of a car provide an acceleration of 5.0m/s^2. How long will it take for a car traveling at 20 m/s to stop

starting from rest a car accelerates at 2.0 m/s^2. How far will it go after 6.0 s

3. Measurements show that 500 muon fall on the top of Mt. Washington altitude 2000m. Muons travel at 99% the speed of light or 0.99 x 3.0 x 10⁸ m/s.

a. Calculate the time in microseconds it would take muon to travel from the top of mt. Washington to its base.

b. Use your calculation and the muon clock graph to find how many muons should reach the bottom of Mt. Washington.

4. Experiments show that the actual number of muons that reach the base of Mt. Washington is 400.

a. According to your muon clock graph, how much time has elapsed if 400 muons reach the base of Mt. Washington?

b. By what factor do the times you found differ?

c. Suggest an explanation for this difference.

2. The half-life of muons provides you with a muon clock. Plot a graph of the number of muons versus time. Use 500 muons as the size of the sample. This graph will become your clock.

a. If 125 muons remain, how much time has elapsed?

b. If 31 muons remain, how much time has elapsed?

c. If 300 muons remain, how much time has elapsed?

d. If 400 muons remain, how much time has elapsed?

Calculate the energy stored in elastic material with K=1500NM and applied force at 750N

A box of mass 500kg is druged along a level ground at a speed of 12metres per second.if the force of friction between the box and the floor is 1200newtons .calculate the power developed?

A man in a sled, with a total mass of 125 kg, slides down a grassy hill and reaches a speed of 8 m/s at the bottom. If a pile of grass can exert a constant force of 250 N, how fast will the sled stop?

Two identical 15.0-kg balls, each 25.0 cm in diameter, are suspended by two

35.0-cm wires. The entire apparatus is supported by a single 18.0-cm wire,

and the surfaces of the balls are perfectly smooth.

a) Find the tension in each of the three wires.

b) How hard does each ball push on the other one?