Chapter 3: Q4. (page 67)
A bullet fired from a rifle begins to fall
(a) as soon as it leaves the barrel
(b) after the air friction reduces its speed
(c) not at all if air resistance is ignored.
A bullet fired from a rifle begins to fall (a) as soon as it leaves the barrel.
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Which of the following statements are not valid for a projectile? Take the upward direction as positive.
(a) The projectile has the same x velocity at any point on its path.
(b) The acceleration of the projectile is positive and decreasing when the projectile is moving upward, zero at the top, and increasingly negative as the projectile descends.
(c) The acceleration of the projectile is a constant negative value.
(d) The y component of the velocity of the projectile is zero at the highest point of the projectileโs path.
(e) The velocity at the highest point is zero.
When Babe Ruth hit a homer over the 8.0-m-high right field fence 98 m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.0 m above the ground and its path initially made a 36ยฐ angle with the ground.
A passenger on a boat moving at 1.70 m/s on a still lake walks up a flight of stairs at a speed of 0.60 m/s (Fig. 3โ43). The stairs are angled at 45ยฐ, pointing in the direction of motion as shown. What is the velocity of the passenger relative to the water?
FIGURE 3-43 Problem 42
A grasshopper hops along a level road. On each hop, the grasshopper launches itself at an angleand achieves a range. What is the average horizontal speed of the grasshopper as it hops along the road? Assume that the time spent on the ground between the hop is negligible.
You are on the street trying to hit a friend in his dorm window with a water balloon. He has a similar idea and is aiming at you with his water balloon. You aim straight at each other and throw at the same instant. Do the water balloons hit each other? Explain why or why not.
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