A student argues that a 1.0-kg rock that falls from a height of 100.0 m to a height of 90.0 m has a gravitational potential energy of 98 J, since the rock's height changed by 10.0 m. What error did the student make? A.
The gravitational potential energy of an object remains constant because the object is in a closed system.
B.
The gravitational potential energy of an object is computed by multiplying 1/2 by the mass times the square of the velocity.
C.
The gravitational potential energy of an object depends on the object's height and not on the change in height.
D.
The student did not make an error.

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

Abasketball star covers 2.65 m horizontally in a jump to dunk the ball. his motion through space can be modeled precisely as that of a particle at his center of mass. his center of mass is at elevation 1.02 m when he leaves the floor. it reaches a maximum height of 1.90 m above the floor and is at elevation 0.910 m when he touches down again. (a) determine his time of flight (his "hang time"). (b) determine his horizontal velocity at the instant of takeoff. (c) determine his vertical velocity at the instant of takeoff. (d) determine his takeoff angle. (e) for comparison, determine the hang time of a whitetail deer making a jump with center-of-mass elevations yi = 1.20 m, ymax = 2.45 m, and yf = 0.750 m.

What is the moment of inertia i of this assembly about the axis through which it is pivoted? express the moment of inertia in terms of mr