Physics Answers

The mass on the end of the string (referred to as the bob) has a mass of 1.30 kg. It is raised to position A, which is a vertical height of 0.350 m above position B. It is released and swings through position B to position C on the other side.
a)What is the maximum gravitational potential energy of the bob? At which position(s) do/does the bob have this value of potential energy?
b) When the pendulum is released, what is the maximum kinetic energy of the bob? At which position does the bob have this value of kinetic energy?
c) What is the maximum speed of the bob?

A 2.50 kg rock is dropped over the edge of a cliff, 35 m above the surface of a river. What is the
speed of the rock just before it strikes the surface of the river?

A cook knocks a 95.0 g egg from a kitchen counter top. When the egg is 65.0 cm above the ground, it has a total mechanical energy of 1.12 J. Determine the kinetic energy of the egg.

When 120g of liquid L1 at 65°C was mixed with Yg of liquid L2 at 35°C the final temperature was 45°C. If the specific heat capacity of L2 is half that of L1 find the mass Yg

. An elastic band is stretched a distance of 15.0 cm by a force of 10.0 N. a) Calculate the work done in stretching the elastic
b) How much elastic potential energy is stored in the elastic?
c) A 1.00-g object is placed on the elastic, and the elastic is released in a vertical direction. How much kinetic energy is transferred to the object by the elastic?
d) What was the speed of the object at the point that it leaves the elastic?
e) How high will the object in question (d) rise?

A 200-g Nerf dart is shot from a dart gun with a kinetic energy of 3.60 J. What was the initial of the speed dart?

A curling rock with a mass of 20.0 kg slides down a sheet of ice at a speed of 6.00 m/s. What is the kinetic energy of the curling rock?

A 40.0-kg student climbs up a ladder to the roof of a building. The gravitational potential energy of the student at this point is 2.00 x 103 J. How high is the student above the ground?

Describe two differences between the mass of an object and the weight of the same object?

An astronaut on earth has a mass of 65.0 kg. What is the weight of the astronaut