PHYS121exam2_practice.pdf - PHYS 121 Oct 17 2017 Name EXAM 2 Practice Show ALL your work and calculations Use g = 9.80m/s2 G = 6.67x10-11 N m2/kg2

# PHYS121exam2_practice.pdf - PHYS 121 Oct 17 2017 Name EXAM...

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PHYS 121 Oct. 17, 2017 Name: _____________________________________ EXAM 2 Practice Show ALL your work and calculations. Use g = 9.80m/s 2 G = 6.67x10 -11 N m 2 /kg 2 Radius of the Earth R E = 6.38x10 6 m Mass of the Earth M E = 5.98 x 10 24 kg 1 hp = 746 W 1 m = 100 cm
1. The only force acting on a particle is shown below. How much work is done by the force when the particle moves: a) from x=0 to x=5 m? b) from x=0 m to x=8 m? 2) A squash ball hits a wall at a 45° angle as shown. What is the direction a) of the change in momentum of the ball, b) of the force on the ball, and c) of the force on the wall? 2 4 6 8 x m 5 5 10 F N
3. Black holes are so dense that even light cannot escape their gravitational field, i.e. the escape velocity for a black hole is greater than the speed of light. Calculate the radius of a black hole that has a mass equal to the mass of the Earth. The speed of light is 3 x 10 8 m/s.
4. A 5 kg block is pulled along a horizontal surface by a force of 20 N applied at a 30 degree angle above the horizontal. The coefficient of kinetic friction between the block and the surface is 0.2.

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