Homework Set #18
1) Three cubes are made from the same material.
As the drawing indicates, they have different
sizes and temperatures. Rank the cubes
according to the radiant energy they emit per
second with the largest rst.
2) The block in the drawing
Homework Set #9
1) A 0.500kg ball is dropped from rest at a point 1.2 m above the oor. The ball rebounds to a
height of 0.7m? What are the magnitude and direction of the impulse of the net force applied to
the ball during the collision with the oor? (Hin
Homework Set #5
Two horizontal forces, F; and E, are acting on a box, but
only F; is shown in the drawing. F; can point either to the
right or to the left. The box moves along the x-axis. There
is no friction between the box and the surf
Homework Set #4
1) The punter on a football team tries to kick a football so that it stays in the air for a long hang
time. If the ball is kicked with an initial velocity of 25.0 m/s at an angle 60.0° above the ground,
what is the hang time?
Homework Set #16
l) Dermatologists often remove small precancerous skin lesions by freezing them quickly with
liquid nitrogen, which has a temperature of 77K. What is this temperature on the a) Celsius and
b) Fahrenheit scales?
2) A simple pendulum con