If you float a piece of wood in a container half-full of water that rests on a weighing scale, the weight reading on the scale will
A) decrease.
B) remain unchanged.
C) increase.
Answer: C
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A 2.0-kg object moving 5.0 m/s collides with and sticks to an 8.0-kg object initially at rest. Determine the kinetic energy lost by the system as a result of this collision
a. 20 J b. 15 J c. 30 J d. 25 J e. 5.0 J
The number of significant figures in 0.40 is
A) one. B) two. C) three. D) four. E) five.
The temperature of outer space is
A) zero. B) about 2.7 kelvin. C) meaningless. D) none of the above
Suppose a baseball travels 425 ft (130 m) from where the batter hits it to where it lands in the stands. The ball’s velocity makes an angle of 40° with respect to the horizontal as the ball leaves the bat. Suppose we first calculate the ball’s initial speed ignoring drag and find it to be . Including drag might plausibly require a higher initial speed for the ball to travel the same horizontal distance. On the other hand, by slowing down the ball’s vertical motion, including drag will increase the ball’s flight time, allowing the ball the same distance with a slower horizontal velocity. So if we include drag, for the ball to fly the same horizontal distance will we need
A. An initial speed greater than 
.
B. An initial speed less than .
C. An initial speed equal to .
D. More information to answer for sure.