Physics Answers

Find analytically the support reaction at B and the load P, for the beam shown in the figure below if the reaction of support A is zero.

How much potential energy does a car gain if a crane lifts the car with a mass

of 1,500 kg and 20 m straight up?

.A distance of 0.002 m separates two objects of equal mass. If the gravitational

force between them is 0.0104 N, find the mass of each object.

The moon has a mass of 7.34 × 1022 kg and a radius of 1.74 × 106 meters. If

you have a mass of 66 kg, how strong is the force between you and the moon?

A motor exerts torque in a carousel for it to attain a speed of 2.5 rev/s starting

from rest in 3.5 s. Find the work done by the motor if the carousel has a radius

of 27 m and a mass of 1.75 X 105 kg. Consider the carousel to be a thin-walled

cylinder rotating about its center

A teacher sits on a rotating stool to demonstrate the conservation of angular

momentum. With her arms outstretched, she rotates at 2.25 rev/s. When the

teacher’s arms are tucked in close to her chest, she rotates at 4.50 rev/s. what

is the ratio of her moment of inertia with outstretched arms to the moment of

inertia with arms tucked in close to her chest?

Find the Torque about the rotation produced by constant force of

(6 + 8 − 10 ) 𝑁 on a particle situated at (3 − 4 ) 𝑚.

Lynne jogs daily around a circular track of diameter 25 m for a total distance of

942 m in 5.0 min. (a) How many times did Lynne jog around the track? (b) What

is Lynne’s average angular speed in radians/s?

Car A of mass of 2000 kg moving at 72 km/h. east try to overtake car B of mass

1250 kg moving at 60 km/h, east. Car A collides with car B. The car stick

together after the collision. Find their velocity after collision. (It should be in

m/s).

A 0.10 Kg model rocket’s engine is designed to deliver an impulse of 6.0 N·s. If

the rocket engine burns for 0.75 s, what is the average force does the engine

produce?