You and your friend both solve a problem involving a skier going down a slope, starting from rest. The two of you have chosen different levels for y = 0 in this problem. Which of the following quantities will you and your friend agree on?
A) skier's PE
B) skier's change in PE
C) skier's final KE
a) only B
b) only C
c) A, B, and C
d) only A and C
e) only B and C
Ans: e) only B and C
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A disk (radius = 8.0 cm) that rotates about a fixed axis starts from rest and accelerates at a constant rate to an angular velocity of 4.0 rad/s in 2.0 s. What is the magnitude of the total linear acceleration of a point on the rim of the disk at the instant when the angular velocity of the disk is 1.5 rad/s?
a. 24 cm/s2 b. 16 cm/s2 c. 18 cm/s2 d. 34 cm/s2 e. 44 cm/s2
When a body moves in a straight line with increasing speed, the net force on it must be increasing
Indicate whether the statement is true or false
Imagine that the sun began glowing half as bright at all visible wavelengths, but glowed much brighter in the infrared. How would this look to us, and why?
What will be an ideal response?
Suppose your friend is sitting on a sled and asks you to move her across a flat, horizontal field. You have a choice of (a) pushing her form behind by applying a force downward on her shoulders at 30° below the horizontal (figure a), or (b) attaching a rope to the front of the sled and pulling with a force at 30° above the horizontal (figure b). Which option would be easier?