Author Question: Two projectiles are fired at equal speeds but different angles. One is fired at an angle of 30 and ... (Read 88 times)

NguyenJ · **on:** Jul 29, 2018

Two projectiles are fired at equal speeds but different angles. One is fired at an angle of 30 and the other at 60. With no air resistance, the projectile to hit the ground first will be the one fired at

A) 30.
B) 60.
C) both hit at the same time

Question 2

In an experiment, a student brings up the rotational speed of a piece of laboratory apparatus to 30.0 rpm. She then allows the apparatus to slow down uniformly on its own, and counts 240 revolutions before the apparatus comes to a stop.

The moment of inertia of the apparatus is known to be 0.0850 kgm2. What is the magnitude of the retarding torque on the apparatus? A) 0.0425 Nm
B) 0.159 Nm
C) 0.0787 Nm
D) 0.000278 Nm
E) 0.0000136 Nm