Mechanics | Relativity Answers

An elevator of mass 1500 kg is at rest and then begins to ascend at an acceleration of 1.0 m / s² . A constant frictional force of 800 N retards its motion upward . ( a ) Find the tension in the cable carrying the elevator . ( b ) Find the minimum power delivered by the motor at t = 4s while the elevator is moving upward . ( c ) What will be the reading on a bathroom scale if a 50 kg person stands on it while the elevator is ascending ?

The forces acting on a body(s) are :F1=30n(60 north of west) f2=40 N (30 north of west)

a-represent the forces acting on (s) on a free body diagram

b-Calculate the magnitude of the net force acting on (s) and indicate its direction

A flywheel has a moment of inertia of 4.8 kg-m2 . What constant force is required to increase its

frequency from 3 rev/s to 6 rev/s in 7 revolutions?

An old rope can now only safely suspended 120 kg. When the rope is tied to a beam, it hangs down with a vertical length of 12.0 m. Calculate the minimum time required for an 85kg person starting from rest to climb the entire length of the rope without breaking it

A table tennis ball has a diameter of 3.80 cm and an average density of 0.0840 g/cm³. What force is required to hold it completely submerged underwater?

You are operating a remote-controlled model car on a vacant tennis court. Your position is the origin of

coordinates, and the surface of the court lies in the 𝑥𝑦-plane. The car, which we represent as a point,

has x- and y- coordinates that vary with time according to

a) Find the car’s coordinates and its distance from you at time t = 2.0 s.

b) Find the car’s displacement and average velocity vectors during the interval from

t = 0 s to t = 2.0 s.

c) Find the components of the average acceleration in the interval from t = 0 s to t =

2.0 s.

suppose a 4,400 pounds(lbs). object was traveling at a speed of 49.2ft/s. now, this mass transfer all its energy to another body with a mass of 44lbs . what Will be the velocity of the 44lbs mass after being hit by it.

3. Measurements shows that 500 muons 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 muons 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.

A 0.5kg basketball moving at 1.4m/s collides with a 1.2kg bowling ball moving at 3.5m/s. After collision, the velocity of the basketball was increased by 0.4m/s. What is the final velocity of the bowling ball?

Ok so, say a giraffe and a raccoon were both running 35mph would they be running side by side or would the giraffe be much farther ahead do to it's longer legs?