A pencil that is 15.7 cm long is released from a vertical position with the eraser end resting on a table. The eraser does not slip as it tips over. Treat the pencil like a uniform rod
What is the angular speed of the pencil just before it hits the table? A) 13.7 rad/s
B) 7.23 rad/s
C) 3.70 rad/s
D) 24.5 rad/s
E) 16.8 rad/s
A
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A 10-N toy rocket blasts straight up from ground level with an initial kinetic energy of 40 J. At the exact top of its trajectory, the total mechanical energy of the rocket-Earth system is 140 J
To what vertical height above the ground does it rise, assuming no air resistance? A) 1.0 m B) 10 m C) 14 m D) 24 m
Two capacitors with capacitances of 1.5 ?F and 0.25 ?F, respectively, are connected in parallel. The system is connected to a 40-V battery. What electrical potential energy is stored in the 1.5-?F capacitor?
a. 1.1E–4 J b. 2.0E–4 J c. 1.2E–3 J d. 1.1E–3 J e. 2.0E–3 J
A 3.45-kg centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration
A point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed. (a) What is the angular acceleration (in rad/s2 ) of the centrifuge as it spins up? (b) How many revolutions does the centrifuge make as it goes from rest to its final angular speed?
A sea breeze on a coast is the result of
a. Rayleigh scattering. b. a convection cycle. c. the Coriolis force. d. friction or drag.