Which of the following quantities has units of a velocity? (There could be more than one correct choice.)
A) 40 km southwest
B) -120 m/s
C) 9.8 m/s2 downward
D) 186,000 mi
E) 9.8 m/s downward
B, E
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A 30-g bullet traveling horizontally at 300 m/s strikes a 1.0-kg block which is attached to a horizontal spring with a force constant of 2000 N/m and rests on a frictionless horizontal surface
The spring is on the far side of the block and aligned with the direction of travel of the bullet. The bullet becomes embedded in the block and, as a result of the impact, and the block slides against the spring. How far is the spring compressed before it reverses its direction of travel? A) 0.20 m B) 0.58 m C) 1.2 m D) 0.40 m E) 0.039 m
As a body cools, its ________ decreases.
A. brightness B. total emitted energy C. internal energy D. All of these choices are correct.
Addition polymers are formed from
a. diacids only. b. alkenes. c. dialcohols only. d. diacids and dialcohols together.
In the first law of thermodynamics, W is the work done on the system, that is, W is positive if work is done on the system
Indicate whether the statement is true or false