A 3.0-kg particle has a position vector given by 
, where 
is in meters and t is in seconds. What is the angular momentum of the particle, in kg?m2/s, about the origin at t = 2 s?
A.
B.
C.
D.
E.
Answer: B
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If two balls are thrown from the same cliff with the same speed, one up, one down, when they touch the ground, they should:
a. have different speed b. the same speed c. touch the ground in the same time d. travel the same distance in the air e. none of above
The shortest distance between two points on a curved surface is a
A) straight line. B) geodesic. C) neither of these
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?
Helium condenses into the liquid phase at approximately 4 K. What temperature, in degrees Fahrenheit, does this correspond to?
a. -182 b. -269 c. -118 d. -452 e. -484