ch 3 projectile motion on-line

8/14/2019 Ch 3 Projectile Motion on-line

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Conceptual Physics, HewittChapter 3: Projectile Motion

Questions About Projectile Motion

1)


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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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Figure 10-B

4)


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A rockis

thrown upward at 50 degrees with respect to the horizontal. As it rises, its vertical component ofvelocity

A)


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increases.B)


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remains unchanged.C)


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decreases.Answer:


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5)


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A rockis

thrown upward at 50 degrees with respect to the horizontal. As it rises, its horizontal componentof velocity

A)


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increases.B)


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remains unchanged.C)


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decreases.Answer:


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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

A)


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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

A)


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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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8)


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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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9)


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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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10)


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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

A)


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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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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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12)


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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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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

A)


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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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14)


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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?

A)


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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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15)


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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?

A)


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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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16)


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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

A)


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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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17)


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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

A)


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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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20)


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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?

A)


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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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22)


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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)

A)


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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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23)


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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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25)


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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

A)


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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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29)


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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?

A)


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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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30)


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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?

A)


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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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31)


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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

A)


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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

32)


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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

A)


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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

33)


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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

34)


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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

A)


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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

35)


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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

A)


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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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