Expert answer:Physics Review Questions

Answer & Explanation:The physics questions are attached below. I would like each questions to be explained step by step in detail in a understandable way. Also I would appreaciate it if the problems are worked out by hand and NOT typed out on a computer with a keyboard 🙂 physics questions.PDF
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Exam 1
Name___________________________________
TRUE/FALSE. Write ‘T’ if the statement is true and ‘F’ if the statement is false.
1) A scalar quantity is described by both a magnitude and a direction.
1)
2) Speed indicates how fast something is moving and in which direction it is moving.
2)
3) An object thrown downward does not experience free fall.
3)
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
4) A new car manufacturer advertises that their car can go “from zero to sixty in 8 s.” This is a
description of
4)
A) average acceleration.
B) average speed.
C) instantaneous speed.
D) instantaneous acceleration.
E) none of the given answers.
5) The slope of a tangent line at a given time value on a position versus time graph gives
5)
A) average acceleration
B) instantaneous velocity.
C) average velocity.
D) instantaneous acceleration.
E) none of the given answers.
6) When is the average velocity of an object equal to the instantaneous velocity?
A) only when the velocity is constant
B) always
C) only when the velocity is decreasing at a constant rate
D) never
E) only when the velocity is increasing at a constant rate
1
6)
7) When a ball is thrown straight up, the acceleration at its highest point is
7)
A) horizontal.
B) upward.
C) minimum.
D) downward.
E) zero.
8) If the acceleration vector of an object is directed anti-parallel to the velocity vector, then
8)
A) the object is at rest.
B) the object is slowing down.
C) the object is speeding up.
D) the object is turning.
E) this situation would not be physically possible.
9) A 200-lb force is pulling on an object, as shown in Figure 3-1.
Figure 3-1
The sign of the x and y components of the force are
A) x (negative), y (positive).
B) x (positive), y (negative).
C) x (positive), y (positive).
D) x (negative), y (negative).
2
9)
Figure 3-2
10) Refer to Figure 3-2. The components of vectors A and B are
A) Ax = A sin90°
Bx = B cos60°
Ay = A cos90°
By = B sin60°.
B) Ax = A cos0°
Bx = -B cos60° Ay = A cos90°
By = B cos30°.
C) Ax = A sin 90°
Bx = B sin 30°
Ay = 0
By = B cos30°.
D) Ax = A cos90°
Bx = B sin60°
Ay = A sin90°
By = B cos60°.
E) Ax = 0
Bx = B sin 30°
Ay = 0
By = B cos30°.
11) Three boys each pull with a 20-lb force on the same object, as shown in Figure 3-5.
Figure 3-5
The resultant force will be
A) zero.
B) 20 lb down.
C) cannot be determined; insufficient information
D) 20 lb to the left.
E) 20 lb up.
3
10)
11)
12) For a projectile launched horizontally, the vertical component of a projectile’s velocity
12)
A) continuously increases.
B) remains a non-zero constant.
C) continuously decreases.
D) is zero.
E) any of the above, depending on position.
13) You hit a handball too hard, and it lands horizontally on top of a roof. If its original velocity was vo
at an angle
13)
above the horizontal, then it lands on the roof with a velocity of
A) 2vo
B) vo sin
C) vo cos
D) zero
E)
2 vo
14) At what angle should a water-gun be aimed in order for the water to land with the greatest
horizontal range?
A) 30°
B) 45°
C)
radians
D) 90°
15) Suppose several forces are acting upon a mass m. The F in F = m a refers to
14)
E) 0°
15)
A) any particular one of the forces.
B) the force of friction acting upon the mass.
C) the vector sum of all the forces.
D) the arithmetic mean of all the forces.
E) the arithmetic sum of all the forces.
16) An arrow is shot straight up. At the top of its path, the net force acting on it is
A) instantaneously equal to zero.
B) equal to its weight.
C) greater than zero, but less than its weight.
D) horizontal.
E) greater than its weight.
4
16)
17) See Figure 4.1. If two identical masses are attached by a light cord passing over a massless,
frictionless pulley of an Atwood’s machine, but at different heights, and then released, then
17)
Figure 4.1
A) the higher mass will go down.
B) the lower mass will go down.
C) the masses will not move.
D) the motion will depend on the amount of the masses.
18) Two identical masses are attached by a light string that passes over a small pulley, as shown in
Figure 4-3.
18)
Figure 4-3
The table and the pulley are frictionless. The masses are moving
A) with an acceleration less than g.
B) with an acceleration equal to g.
C) with an acceleration greater than g.
D) at constant speed.
19) Two toy cars (16 kg and 2 kg) are released simultaneously on an inclined plane that makes an angle
of 30° with the horizontal. Which statement best describes their acceleration after being released?
A) Both cars accelerate at a rate of g sin(30°).
B) Both cars accelerate at a rate of 0.866 g.
C) The 2-kg car accelerates 8 times faster than the 16-kg car.
D) The 16-kg car accelerates 8 times faster than the 2-kg car.
E) Both cars accelerate at a rate of 8 g.
5
19)
20) To push a piece of heavy furniture across the carpet usually takes more force to get it moving than
it takes to keep is moving. This is because
20)
A) of Newton’s first law.
B) of Newton’s second law.
C) the kinetic coefficient of friction is larger than the static coefficient.
D) of Newton’s third law.
E) the static coefficient of friction is larger than the kinetic coefficient.
21) A toolbox, of mass M, is resting on a flat board, as shown in Figure 4-5. One end of the board is
lifted up until the toolbox just starts to slide.
21)
Figure 4-5
The angle
that the board makes with the horizontal, for this to occur, depends on the
A) coefficient of static friction, µs.
B) acceleration of gravity, g.
C) coefficient of kinetic friction, µk.
D) mass, M.
E) all of the above quantities.
22) A motorist travels for 3.0 h at 80 km/h and 4.0 h at 60 km/h. What is her average speed for the trip?
A) 74 km/h
B) 140 km/h
C) 70 km/h
D) 69 km/h
E) 73 km/h
23) Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a
Southward direction. What displacement will now take her back to her initial position?
A) 30. km Northward + 30. km Westward
B) 30. km Westward + 40. km Northward
C) 50. km Northwest
D) 40. km Westward + 30. km Northward
E) 40. km Eastward + 30. km Southward
6
22)
23)
Figure 2-13
24) Figure 2-13 represents the velocity of a particle as it travels along the x-axis. What is the average
acceleration of the particle between t = 1 second and t = 4 seconds?
A) 2.5 m/s2
B) 1.7 m/s2
C) 0.33 m/s2
D) 2.0 m/s2
24)
E) 3.5 m/s2
Figure 2-15
25) Figure 2-15 shows the velocity-versus-time graph for a basketball player traveling up and down
the court in a straight-line path. Find the net displacement of the player for the 10 s shown on the
graph.
A) 12 m
B) 20 m
C) 14 m
D) 18 m
E) 16 m
26) An object is thrown upwards with a speed of 14 m/s. How high above the projection point does it
reach?
A) 25 m
B) 5.0 m
C) 15 m
D) 10 m
B) 98 m/s.
C) 24.5 m/s.
7
D) 32. ft/s.
26)
E) 20 m
27) A bullet shot straight up returns to its starting point in 10 s. Its initial speed was
A) 9.8 m/s.
25)
27)
E) 49 m/s.
28) If you run a complete loop around an outdoor track (400 m) in 100 s, your average velocity is
28)
A) 4.00 km/s.
B) zero.
C) 4.0 m/s.
D) 40,000 m/s.
E) 0.25 m/s.
29) A jet fighter plane is launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at
the end of the catapult, and this requires 2 s. Assuming the acceleration is constant, what is the
length of the catapult?
A) 66 m
B) 16 m
C) 42 m
D) 24 m
E) 84 m
30) A player throws a football 50.0 m at 61.0° north of west. The westward component of the
displacement of the football thrown is given by
A) 55.0 m.
B) 24.2 m.
C) 64.7 m.
D) 0 m.
B) 20.0 m/s
C) 8.5 m/s
D) 12.6 m/s
B) 41.8°
C) 53.0°
D) 48.2°
B) 7.0 m
C) 60 m
D) 21 m
x-comp
3.50
2.00
-5.50
33)
E) 13 m
34) Three vectors, expressed in Cartesian coordinates, are
S
T
U
32)
E) 30.0°
33) A vector A has components Ax = 12 m and Ay = 5.0 m. What is the magnitude of vector A ?
A) 17 m
31)
E) 18.1 m/s
32) A butterfly moves with a speed of v = 12.0 m/s. The x-component of its velocity is 8.00 m/s. The
angle between the direction of its motion and the x-axis must be
A) 60.0°
30)
E) 74.0 m.
31) A boy jumps at a speed of 20.0 m/s at an angle of 25.0° above the horizontal. What is the horizontal
component of the boy’s velocity?
A) 15.6 m/s
29)
34)
y-comp
-4.50
0
2.50
The magnitude of the resultant vector is
A) 13.0
B) 5.5
^
^
C) 11.1
D) 2.0
^
E) 7.0
^
35) If vector A = -3.0 x – 4.0 y, and vector B = +3.0 x -8.0 y, then the magnitude of vector C = A – B
is
A) 3.0
B) 13.4
C) 16
D) 7.2
8
E) 144
35)
36) A ball thrown horizontally from a point 24 m above the ground strikes the ground after traveling
horizontally a distance of 18 m. With what speed was it thrown? (in this problem use g = 10 m/s2)
A) 8.96 m/s
B)
3g
C) 8.13 m/s
D) 6.10 m/s
E) 7.40 m/s
37) Janice throws a stone horizontally from the roof edge of a 50. meter high dormitory. It hits the
ground at a point 60. m from the building. What was the initial velocity?
A) 5.5 m/s
B) 22. m/s
C) 19. m/s
D) 25. m/s
E)
B) 16 m
C) 20 m
D) 14 m
B) 32. m
C) 28. m
D) 37. m
B) 2.58 s
C) 1.8 s
D) 17.3 s
B) 10. m/s2
C) 40. m/s2
D) 0.18 km/s2
B) 10. kN
C) 11. kN
9
D) 40. kN
41)
E) 0.16 km/s2
42) An elevator weighing 10,000. N is supported by a steel cable. Determine the tension in the cable
when the elevator is accelerated upward at 3.0 m/s2 . (g = 9.8 m/s2)
A) 13. kN
40)
E) 0.95 s
41) If a force accelerates 4.5 kg at 40.m/s2 , that same force would accelerate 18. kg by how much?
A) 32. ft/s2
39)
E) 25. m
40) A girl throws a stone straight down from a bridge. The stone leaves her hand with speed of 8.00
m/s at a height of 12 m above the water below. How much time does it take for the stone to hit the
water?
A) 0.41 s
38)
E) 12 m
39) Johnny throws a shotput at an angle of 45.° and it travels a horizontal distance of 30. meters. If he
releases the shotput at the same speed but changes the angle to 55.°, what will be the new range
(distance)?
A) 41. m
37)
2 g m/s
38) A girl throws a rock horizontally, with a velocity of 10 m/s, from a bridge. It falls 20 m to the water
below. How far does the rock travel horizontally before striking the water? (use g = 10 m/s2 )
A) 24 m
36)
E) 7.0 kN
42)
43) A 42.0 kg block of ice slides down the plane incline 34.0° in Figure 4-12.
43)
Figure 4-12
Assuming friction is negligible, what is the acceleration of the block down the incline?
A) 9.80 m/s2
B) 6.61 m/s2
C) 2.73 m/s2
D) 8.12 m/s2
E) 5.48 m/s2
44) Consider a 42.0 kg block of ice sliding down the 34.0° plane, as shown in Figure 4-13.
44)
Figure 4-13
Assuming the kinetic coefficient of friction is 0.060, what is the acceleration of the block down the
incline?
A) 6.56 m/s2
B) 2.73 m/s2
C) 5.00 m/s2
D) 8.06 m/s2
E) 9.74 m/s2
45) A horizontal force of 5.0 N accelerates a 4.0 kg mass, from rest, at a rate of
0.50 m/s2 in the positive direction. What friction force acts on the mass?
A) -3.0 N
B) -3.3 N
C) +2.0 N
D) +3.0 N
46) A block of mass M slides down a frictionless plane inclined at an angle
normal reaction force exerted by the plane on the block is
A) Mg sin .
B) zero, since the plane is frictionless.
C) Mg tan .
D) Mg.
E) Mg cos .
10
45)
E) -2.0 N
with the horizontal. The
46)
47) An antitank weapon fires a 3.0 kg rocket which acquires a speed of 50. m/s after traveling 90. cm
down a launching tube. Assuming the rocket was accelerated uniformly, what force acted on it?
A) 2.8 kN
B) 2.0 kN
C) 3.6 kN
D) 5.8 kN
E) 4.2 kN
48) Stacy (S) and David (D) are having a tug-of-war by pulling on opposite ends of a 5.0 kg rope. Stacy
pulls with a 15. N force. What is David’s force if the rope accelerates toward Stacy at 2.0 m/s2 ?
A) 15 N
B) 5 N
C) 25 N
D) 50 N
47)
48)
E) 3 N
Figure 2-11
49) Refer to Figure 2-11. If you start from the Bakery, travel to the Cafe, and then to the Art Gallery,
what is your displacement?
49)
A) 6.5 km South
B) 4.0 km South
C) 2.5 km South
D) 9.0 km North
E) 10.5 km North
50) If you run a complete loop around an outdoor track (400 m) in 100 s, your average speed is
A) 4.0 m/s.
B) 40000. m/s.
C) 4.0 km/h.
D) 0.40 m/s.
E) 4.0 mph.
11
50)
…
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