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Conceptual Physics, HewittChapter 3: Projectile Motion
Questions About Projectile Motion
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Which of the following is not a vector quantity?A)
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velocityB)
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speedC)
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accelerationD)
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None are vector quantities.E)
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All are vector quantities.Answer:
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BDiff: 1Topic: Projectile Motion
2)
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An airplane that flies at 100 km/h in a 100 km/h hurricane crosswind has a ground speed ofA)
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0 km/h.B)
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100 km/h.C)
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141 km/h.D)
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200 km/h.Answer:
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CDiff: 1Topic: Projectile Motion
3)
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An airplane travels at 141 km/h toward the northeast. What is its component of velocity due north?A)
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41 km/hB)
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100 km/hC)
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110 km/hD)
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141 km/hAnswer:
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BDiff: 1Topic: Projectile Motion
Figure 10-B
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A rockis
thrown upward at 50 degrees with respect to the horizontal. As it rises, its vertical component ofvelocity
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increases.B)
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remains unchanged.C)
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decreases.Answer:
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CDiff: 1Topic: Projectile Motion
5)
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A rockis
thrown upward at 50 degrees with respect to the horizontal. As it rises, its horizontal componentof velocity
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increases.B)
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remains unchanged.C)
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decreases.Answer:
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BDiff: 1Topic: Projectile Motion
6)
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A stoneis
thrown horizontally from the top of a cliff. One second after it has left your hand its verticaldistance below the top of the cliff is
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5 m.B)
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10 m.C)
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15 m.Answer:
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ADiff: 1Topic: Projectile Motion
7)
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Throwan
object upward at a 45 degree angle. With no gravity it will follow a straight-line path. But becauseof gravity, at the end of 1 second, it is
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about 5 m below the straight line.B)
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about 10 m below the straight line.C)
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about 15 m below the straight line.Answer:
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ADiff: 1Topic: Projectile Motion
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Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocityA)
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decreases.B)
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remains constant.C)
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increases.Answer:
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BDiff: 1Topic: Projectile Motion
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A bullet fired horizontally from a rifle begins to fallA)
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as soon as it leaves the barrel.B)
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after air friction reduces its speed.C)
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neither of theseAnswer:
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ADiff: 1Topic: Projectile Motion
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Aprojectil
e is launched vertically upward at 50 m/s. If air resistance is negligible, its speed upon returningto its starting point is
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less than 50 m/s.B)
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50 m/s.C)
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more than 50 m/s.Answer:
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BDiff: 1Topic: Projectile Motion
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11)
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An Earth satellite is simply a projectileA)
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freely falling around the earth.B)
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floating motionless in space near the earth.C)
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approaching the earth from outer space.Answer:
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ADiff: 1Topic: Projectile Motion
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Earth satellites are typically more than 100 km high so as to be above the Earth'sA)
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atmosphere.B)
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gravitational field.C)
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both of theseAnswer:
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ADiff: 1Topic: Projectile Motion
13)
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Aprojectil
e is fired horizontally in a region of no air resistance. The projectile maintains its horizontalcomponent of velocity because
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it is not acted on by any forces.B)
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it is not acted on by any horizontal forces.C)
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it has no vertical component of velocity to begin with.D)
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the net force acting on it is zero.E)
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none of theseAnswer:
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BDiff: 1Topic: Projectile Motion
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Ahunter
on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneouslydropping another bullet from the level of the rifle. Which bullet will hit the ground first?
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the dropped oneB)
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the fired oneC)
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Both hit at the same time.Answer:
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ADiff: 1Topic: Projectile Motion
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Ahunter
on level ground fires a bullet at an angle of 2 degrees below the horizontal while simultaneouslydropping another bullet from the level of the rifle. Which bullet will hit the ground first?
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the dropped oneB)
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the fired oneC)
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Both hit at the same time.Answer:
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BDiff: 1Topic: Projectile Motion
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A bulletfired
horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice thespeed in the same direction, it would have hit the ground in
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less than 0.5 s.B)
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more than 0.5 s.C)
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0.5 s.Answer:
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CDiff: 2Topic: Projectile Motion
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Anobject
is dropped and freely falls to the ground with an acceleration of 1 g. If it is thrown upward at anangle instead, its acceleration will be
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0 g.B)
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1 g downward.C)
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1 g upward.D)
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larger than 1 g.E)
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none of theseAnswer:
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BDiff: 2Topic: Projectile Motion
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A gunwith a
muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how fardownrange will the bullet be 1 second later?
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50 mB)
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98C)
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100D)
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490E)
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none of theseAnswer:
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CDiff: 2Topic: Projectile Motion
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After arock
thrown straight up reaches the top of its path and then falls a short distance, its acceleration is(neglect air resistance)
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greater than when it was a the top of its path.B)
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less than when it was at the top of its path.C)
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the same as it was at the top of its path.Answer:
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CDiff: 2Topic: Projectile Motion
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What prevents satellites such as a space shuttle from falling?A)
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gravityB)
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the absence of air dragC)
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Nothing; they're falling continuously all around the Earth.Answer:
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CDiff: 2Topic: Projectile Motion
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Theground
speed of an airplane that has an airspeed of 200 km/h when it is in a 200-km/h crosswind is
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0 km/h.B)
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200 km/h.C)
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283 km/h.D)
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400 km/h.E)
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1600 km/h.Answer:
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CDiff: 2Topic: Projectile Motion
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A ballplayer
wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m abovethe ground. The player sees the ball land 20 m down range. What is the player's pitching speed?
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about 5 m/sB)
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about 10 m/sC)
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about 20 m/sD)
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about 25 m/sE)
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none of theseAnswer:
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CDiff: 3Topic: Projectile Motion
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Anairplane
flies at 40 m/s at an altitude of 50 meters. The pilot drops a heavy package which falls to theground. Where, approximately, does the package land relative to the plane's new position?
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beneath the planeB)
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400 m behind the planeC)
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500 m behind the planeD)
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more than 500 m behind the planeE)
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none of theseAnswer:
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ADiff: 3Topic: Projectile Motion
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A bulletis fired
horizontally with an initial velocity of 300 m/s from a tower 20 m high. If air resistance isnegligible, the horizontal distance the bullet travels before hitting the ground is about
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200 m.B)
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300 m.C)
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400 m.D)
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500 m.E)
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600 m.Answer:
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EDiff: 3Topic: Projectile Motion
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A river100 m
wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the water is pointed due east asit crosses from the west bank. The boat reaches the east bank
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due east of where it started.B)
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141 m farther south than where it started.C)
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100 m farther south than where it started.D)
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100 m farther north than where it started.Answer:
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CDiff: 3Topic: Adding Vectors
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A river100 m
wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as itcrosses from the west bank. Relative to the Earth, the boat travels
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nowhere.B)
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141 m.C)
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100 m.D)
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200 m.E)
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241 m.Answer:
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BDiff: 3Topic: Adding Vectors
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A river100 m
wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as itcrosses from the west bank. The boat crosses in
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50 s.B)
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100 s.C)
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141 s.D)
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200 s.Answer:
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BDiff: 3Topic: Adding Vectors
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A river100 m
wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the water leaves the west bank.To land at a point due east of its starting point, the boat must be pointed
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northeast.B)
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east.C)
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southeast.D)
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Nowhere: it can't be done.Answer:
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DDiff: 5Topic: Adding Vectors
http://www.euclideanspace.com/physics/kinematics/angularvelocity/
http://www.valdosta.edu/~pbaskin/ch1-4review.htm
http://www.euclideanspace.com/physics/kinematics/angularvelocity/http://www.valdosta.edu/~pbaskin/ch1-4review.htmhttp://www.euclideanspace.com/physics/kinematics/angularvelocity/http://www.valdosta.edu/~pbaskin/ch1-4review.htm -
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