The trajectory of a cannonball fired from a canon depends on
1) the initial velocity.
2) the angle of projection.
3) the effects of air resistance.
4) all of these.
When air resistance does affect motion, the cannonball doesn't travel
5) as high.
6) as far.
7) as high and as far.
Answer: 4, 7
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Acceleration: The captain orders his starship to accelerate from rest at a rate of "1 g" (1 g = 9.8 m/s2). How many days does it take the starship to reach 10% the speed of light? (Light travels at 3.0 × 108 m/s.)
Fill in the blank(s) with the appropriate word(s).
A car of mass 1100 kg that is traveling at 27 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting on the car?
A) 410 N B) 340 N C) 550 N D) 690 N
A pool ball moving at 3 m/s collides head-on with an identical pool ball that's initially at rest. Just after the collision, the second ball moves away at 2 m/s while the first ball
A) moves at 3 m/s in a direction opposite to the second ball. B) continues moving at 3 m/s in the same direction. C) is at rest. D) moves at 1 m/s in the same direction as the second ball. E) moves at 1 m/s in a direction opposite to the second ball.
The EPA suggested that General Electric should pay to clean up PCBs that were allowed to get into the Hudson River. General Electric has objected
The EPA suggests that wildlife is being affected more than can be explained by leaks in the factories; the company counters that dredging will release even more. Discuss this controversy with as much objectivity as you can.