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Phys161 HW3 2D Kinematics - 2017 0914 174112
Course
General Physics I (PH 161)
63 Documents
Students shared 63 documents in this course
University
Montgomery College
Academic year: 2018/2019
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Raluca Teodorescu- Montgomery College Phys 1 1
HW3 - 2D Kinematics
Due never
1ptA car starts from rest and travels for 5 a
uniform acceleration of +1/s 2. The driver then applies
the brakes, causing a uniform acceleration of -2/s 2 .If
the brakes are applied for 3, how fast is the car going at
the end of the braking period?
(inm/s)
1. A© 4. 61 × 10 − 1 B© 5. 39 × 10 − 1 C© 6. 31 × 10 − 1
D© 7. 38 × 10 − 1 E© 8. 64 × 10 − 1
1ptHow far has the car gone?
(inm)
2. A© 3. 14 × 101 B© 3. 55 × 101 C© 4. 01 × 101
D© 4. 54 × 101 E© 5. 12 × 101
1pt
A soccer ball is kicked with a speed of 9 m/s at an angle
of 23◦above the horizontal. If the ball lands at the same
level from which it was kicked, how long was it in the air?
(ins)
3. A© 2. 37 × 10 − 1 B© 3. 15 × 10 − 1 C© 4. 20 × 10 − 1
D© 5. 58 × 10 − 1 E© 7. 42 × 10 − 1
1ptA ball is thrown from a point 1 m above the ground.
The initial velocity is 18 m/s at an angle of 27◦above the
horizontal. Find the maximum height of the ball above the
ground.
(inm)
4. A©1 B©2 C©2 D©3.
E©4.
1ptCalculate the speed of the ball at the highest point in
the trajectory.
(inm/s)
5. A©6 B©8 C© 1. 06 × 101
D© 1. 33 × 101 E© 1. 66 × 101
1pt
Playing shortstop, you pick up a ground ball and throw it to
second base. The ball is thrown horizontally, with a speed
of 21 m/s, directly toward point A, as shown in the figure
below.
A
B
When the ball reaches the second baseman 0 s later, it is
caught at point B. How far were you from the second base-
man?
(inm)
6. A©5 B©7 C© 1. 06 × 101
D© 1. 53 × 101 E© 2. 22 × 101
1ptWhat is the distance of vertical drop, AB?
(inm)
7. A© 6. 01 × 10 − 1 B© 7. 51 × 10 − 1 C© 9. 38 × 10 − 1
D©1 E©1.
Raluca Teodorescu- Montgomery College Phys 1 5
HW3 - 2D Kinematics
1pt
In the position vs. time graphs above, all times are in seconds
and all positions are in meters. Which of the following state-
ments are true about the graphs shown above? Hint: keep
in mind that velocity is a vector and speed is a scalar.
◃The average velocity is non-zero in Figure F
18 .A©True B©False
◃The average velocity is zero in Figures A and B
19 .A©True B©False
◃The average velocity is positive in Figure C
20 .A©True B©False
◃The net displacement is zero in Figures A and B
21 .A©True B©False
◃The object is at rest all of the time in Figure F
22 .A©True B©False
1pt Due never A firefighter, 47 from a burning
building, directs a stream of water from a ground level fire
hose at an angle of 32 deg above the horizontal. If the speed
of the stream as it leaves the hose is 39/s, at what height
will the stream of water strike the building?
(inm)
23. A© 1. 26 × 101 B© 1. 47 × 101 C© 1. 72 × 101
D© 2. 01 × 101 E© 2. 35 × 101
1ptMatch the verbal description of motion for
an object with the corresponding v vs. t graph.
◃a car is driving along at a constant speed, then decelerates
at a constant rate, coming to a stop
24 .A© 1 B© 2 C© 3 D© 4
E©none of the above
◃a car is sitting at rest at a red light, then accelerates away
when the light turns green
25 .A© 1 B© 2 C© 3 D© 4
E©none of the above
◃a car accelerates away from a STOP sign at a constant
rate, then decelerates at a constant rate when approaching
the next STOP sign
26 .A© 1 B© 2 C© 3 D© 4
E©none of the above
◃a car is accelerating at a constant rate, then suddenly
crashes into a solid brick wall
27 .A© 1 B© 2 C© 3 D© 4
E©none of the above
◃a car is accelerating along the freeway on-ramp, then gets
on the freeway and continues at a constant speed
28 .A© 1 B© 2 C© 3 D© 4
E©none of the above
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Phys161 HW3 2D Kinematics - 2017 0914 174112
Course: General Physics I (PH 161)
63 Documents
Students shared 63 documents in this course
University: Montgomery College
Was this document helpful?
Raluca Teodorescu - Montgomery College Phys 1 1
HW3 - 2D Kinematics
Due never
1pt A car starts from rest and travels for 5.17 swith a
uniform acceleration of +1.40 m/s2. The driver then applies
the brakes, causing a uniform acceleration of -2.03 m/s2.If
the brakes are applied for 3.14 s, how fast is the car going at
the end of the braking period?
(in m/s)
1. A!4.61 ×10−1B!5.39 ×10−1C!6.31 ×10−1
D!7.38 ×10−1E!8.64 ×10−1
1pt How far has the car gone?
(in m)
2. A!3.14 ×101B!3.55 ×101C!4.01 ×101
D!4.54 ×101E!5.12 ×101
1pt
A soccer ball is kicked with a speed of 9.13 m/s at an angle
of 23.5◦above the horizontal. If the ball lands at the same
level from which it was kicked, how long was it in the air?
(in s)
3. A!2.37 ×10−1B!3.15 ×10−1C!4.20 ×10−1
D!5.58 ×10−1E!7.42 ×10−1
1pt A ball is thrown from a point 1.29 m above the ground.
The initial velocity is 18.6 m/s at an angle of 27.0◦above the
horizontal. Find the maximum height of the ball above the
ground.
(in m)
4. A!1.57 B!2.09 C!2.79 D!3.71
E!4.93
1pt Calculate the speed of the ball at the highest point in
the trajectory.
(in m/s)
5. A!6.79 B!8.49 C!1.06 ×101
D!1.33 ×101E!1.66 ×101
1pt
Playing shortstop, you pick up a ground ball and throw it to
second base. The ball is thrown horizontally, with a speed
of 21.6 m/s, directly toward point A, as shown in the figure
below.
A
B
When the ball reaches the second baseman 0.489 s later, it is
caught at point B. How far were you from the second base-
man?
(in m)
6. A!5.02 B!7.28 C!1.06 ×101
D!1.53 ×101E!2.22 ×101
1pt What is the distance of vertical drop, AB?
(in m)
7. A!6.01 ×10−1B!7.51 ×10−1C!9.38 ×10−1
D!1.17 E!1.47
