Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At which of the following times does the average angular acceleration equal the instantaneous angular acceleration?
a. 0.50 T
c. 0.71 T
b. 0.67 T
d. all of the above
D
You might also like to view...
Current: A charge of 12 C passes through an electroplating apparatus in 2.0 min. What is the average current in the apparatus?
A. 0.10 A B. 0.60 A C. 1.0 A D. 6.0 A
Slanting Surfaces With Friction: A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N that is parallel to the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the acceleration of the block?
A. 0.528 m/s2 B. 0.158 m/s2 C. 0.412 m/s2 D. 0.983 m/s2 E. 0.260 m/s2
An air-filled 3.0 nF capacitor is charged to 8.0 V. If the plate separation is 100
m what is the energy density in the electric field?
a. 
b. 
c. 
d. 
e. 
Which is a reason that we know dark energy is a major componentof the universe?
a) The universe would not be 2.7 degrees Kelvin today without dark energy. b) The gravity due to regular matter in the universe would have started it contractingagain by now without dark energy. c) Supernovae would not occur without dark energy. d) Dark energy is needed in order that light can escape from supermassive black holes. e) The universe is flat and regular matter doesn't contribute enough energy density.