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NJIT PHYS 111 - Physics 1
Instructor: Matthew Cooper
Chapter 5 Take Home Quiz
Question 1
A hockey player practices their scoring skills using a special puck which has an accelerometer built into it, as shown in
Figure 1. This puck has a mass of .190 kg. Initially, the puck speeds towards the goal at 93 miles per hour after being
Figure 1
hit. The accelerometer in the puck measures 1
.
73
×
10
3
m
s
2
while interacting with the stick which applies a constant
force, and
−
.
588
m
s
2
as it travels from the stick to the goal. Several others are also skating around, cutting into the
ice with their skates while the player practices. After some time, the accelerometer now measures 1
.
12
×
10
3
m
s
2
while
interacting with the stick, and
−
1
.
96
m
s
2
during the motion to the goal. The player claims the friction created from
others skating slowed down their shots, not fatigue. To determine if this is true, calculate the following:
a.) The free-body-diagram of the puck while the hockey stick is applying a constant force
b.) The free-body-diagram of the puck after the interaction with the hockey stick.
1
c.)
µ
k
before practice
d.)
µ
k
after practice
e.)
F
player
before practice
f.)
F
player
after practice
g.) Was it friction or fatigue?
2
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I need help solving question number 1 please
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7. Use the following number association:
1 = vector
2= scalar
Identify the following as a vector or scalar quantity, by matching it with the
appropriate number.
Momentum is a
quantity. (a)
Kinetic energy is a
Impulse is a
Time is a
The values for a, b, c, and d are
and
Your answer:
0000
Use the following information to answer the next two questions
An atom of thorium, initially at rest, decays into two particles with one particle having
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8.
The magnitude of the velocity of the particle with less mass, expressed in scientific
notation, is a.bc x 10d m/s. The values of a, b, c and d are.
and
(Record your answer in the numerical-response section below.)
Your answer:
0000
9. The system can be considered
because
EPIC
O
GAMES
MacBook Air
quantity. (b)
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Part A
A rocket cruises past a laboratory at
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What is the proton's speed in the laboratory frame?
a proton is launched with velocity (in the laboratory
frame)
v = (1.27 x 10i +1.27 × 10®5) m/s.
Express your answer with the appropriate units.
µA
画]?
Value
Units
v =
Submit
Request Answer
Part B
What is the angle from the y-axis of the proton's speed in the laboratory frame?
Express your answer with the appropriate units.
µA
画]
Value
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P Pearson
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The momentum of an object depends on which two quantities?
O A. velocity and weight
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OC. velocity and kinetic energy
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B.
D.
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What fraction of the total energy released goes into the kinetic energy of the proton?
Express your answer as a percentage.
Kp
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%
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Masski
Clever
Che x P Angel C
Q Summa
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New Tab
JMZNZQOMJAZMTY4/a/MJUYOTI1NTKONDYO/details
Learning Check for understanding 1
Match L) length M) mass
V) volume
A. A bag of tomatoes is 4.6 kg.
B. A person is 2.0 m tallI.
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A bottle contains 1.5 L of water.
Learning Check
D.
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b. Two students discuss part a)
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་
Part A
A starship voyages to a distant planet 10 ly away.
The explorers stay 4.0 yr, return at the same
speed, and arrive back on earth 26 yr after they
left. Assume that the time needed to accelerate and
decelerate is negligible.
What is the speed of the starship?
Express your answer using two significant figures.
= 0.91
Submit
Previous Answers
Part B
Correct
Important: If you use this answer in later parts, use the full unrounded value in your calculations.
How much time has elapsed on the astronauts' chronometers?
Express your answer using two significant figures.
Η ΜΕ ΑΣΦ
t = 52.4
Submit
Previous Answers Request Answer
?
× Incorrect; Try Again; 5 attempts remaining
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F1
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ype here to search
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Homework 1-2 Kinematic Equations 2-D
1. The motion of the particle is described by the system of the equations
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6
(a) Derive the components of the velocity (v and vy) and the accelera-
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Y
(b) Determine the initial position, the initial velocity, the acceleration,
and the magnitudes of the initial velocity of the particle.
H
[x(t) = 4t-8, [m]
y(t) = -3t²6t+ 45, [m]
(c) Determine the position, the velocity, and the magnitude of the ve-
locity of the particle at t = 2 s
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Before
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m
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In motion at 4 m/s
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