Author Question: From the edge of a roof you throw a snowball downward that strikes the ground with 100 J of kinetic ... (Read 48 times)

JGIBBSON · **on:** Jul 29, 2018

From the edge of a roof you throw a snowball downward that strikes the ground with 100 J of kinetic energy. Then you throw a second snowball upward with the same initial speed, and this too falls to the ground.

Neglecting air resistance, the second snowball hits the ground with a kinetic energy of
A) less than 100 J.
B) 100 J.
C) 200 J.
D) more than 200 J.
E) none of the above

Question 2

One way that future space stations may create artificial gravity is by rotating the station. Consider a cylindrical space station 380 m in diameter that is rotating about its longitudinal axis.

Astronauts walk on the inside surface of the space station. How long will it take for each rotation of the cylinder if it is to provide normal gravity for the astronauts?
A) 6.2 s B) 28 s C) 4.4 s D) 39 s