Mechanics | Relativity Answers

A box has a mass of 5.8 kg. The box is lifted from the garage floor and placed on a

shelf. If the box gains 245 J of potential energy, how high is the shelf?

The summit of Mount Everest is 8848.0 m above sea
 level, making it the highest summit on Earth. In 1953, Edmund Hillary was the first person to reach the summit. Suppose upon reaching there, Hillary slid a rock from rest with a 32.0 g mass down the side of the mountain. If the rock's speed was 24.0 m/s when it was 7690.0 m above sea level, how much work was done
on the rock by air resistance?

A star having rotational inertia of 10 1049 kgm2 is rotating at an angular speed of 2.0 revolutions per month about its axis. The only force on it is the force of gravitation. When its nuclear fuel is exhausted, it shrinks to a neutron star having rotational inertia of 6.0 x 1048 kgm². Determine the angular speed of the neutron star in revolutions per month.

A star having rotational inertia of 10 1049 kgm2 is rotating at an angular speed of 2.0 revolutions per month about its axis. The only force on it is the force of gravitation. When its nuclear fuel is exhausted, it shrinks to a neutron star having rotational inertia of 6.0 x 1048 kgm². Determine the angular speed of the neutron star in revolutions per month.

What force must be exerted on the master cylinder of a hydraulic lift to support the weight of a 2 500 kg car a large car resting on the slave cylinder? The master cylinder has a 4.00 cm diameter and the slave has a 25.0 cm diameter.

A "moving sidewalk" in an airport terminal building moves at 1.0 m/s and is 35.0 m long. If a woman steps on at one end and walks at 1.5 m/s relative to the moving sidewalk, how much time does she require to reach the opposite and if she walks (a) in the same direction the sidewalk is moving? (b) In the opposite direction?

A swimmer jumps into a river and swims

straight for the other side at 1.5 km/h [N]

relative to the water. There is a current in the

river of 2.0 km/h [W].

a. What is the swimmer’s velocity relative

to the ground? [2.5 km/h [N53°W]]

b. If the river is 150 m wide, how long will

it take them to cross the river?

a styrofoam cylinder, filled with water, sits on a table. you then poke a small hole through the side of the cylinder, 20 cm below the top of the water surface. what is the speed of the fluid emerging from the hole?

A cue ball on a pool table is hit with the cue stick in one corner of the table and rolls to the opposite corner.  The mass of the ball is 0.17 kg and it starts rolling at a speed of 3.6 m/s.  By the time it reaches the opposite corner of the table, the ball has a kinetic energy of 0.65 J.  Determine the following: (a) the initial kinetic energy, (b) the speed of the ball at the opposite corner of the table, and (c) the work done by friction as the ball rolls from one corner to the other.

A particle makes 240 revolution per minute (rpm)on a circle of radius 3.5.find it's

Angular velocity

Linear velocity

Linear acceleration