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Physics
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Apr 3, 2024
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Physics 211 Spring 2021
February 2021
1)
2)
Forces and Free-Body Diagrams
(Default)
The next two questions pertain to the situation described below.
A box of mass m hangs by a string from the ceiling of an elevator that is
accelerating upward.
Which of the following best describes the tension T in the string?
a. T < mg
b. T = mg
c. T > mg
Briefly explain your answer to the previous question.
3)
4)
The next two questions pertain to the situation described below.
A box of mass m is hung by a spring from the ceiling of an elevator. When
the elevator is at rest, the length of the spring is L = 1m.
As the elevator accelerates upward, the length of the spring will be
a. L < 1 m
b. L = 1 m
c. L > 1 m
Briefly explain your answer to the previous question.
5)
6)
The next two questions pertain to the situation described below.
A block sits at rest on a horizontal frictionless surface. Which of the
follwoing sketches most closely resembles the correct free body diagram for
all forces acting on the block. Each red arrow represents a force.
a. A
b. B
c. C
d. D
Briefly describe the forces represented by each of the arrows in your
choice for the above question.
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Related Questions
University Physics 1 - Newton's lawI need help with this problem and a very detailed explanation of the solutions described below:
Should the tension in the string be less than, greater than, or equal to the gravitational force acting on M2.? Explain your answer conceptually, meaning without any equations or numbers.
The tension in the string should be less than gravitational force acting on M2
Because?
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Astronomy help
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Multiple Choice
Identify the choice that best completes the statement or answers the question
11
A stationary block is at rest on a rough
inclined plane, as shown. If F, is the force of
gravity, FN is the normal force, and Fr is the
force of friction, which free-body diagram
below is correct?
a.
12. Which of the following statements is not correct?
The weight of a body on Earth is a measure of the gravitational attraction of Earth on that
body
b.
a.
Gravitational force is a scalar quantity because it has magnitude only,
The gravitational mass of a body depends on its surroundings and altitude.
Weight and force have both magnitude and direction.
C.
d.
13 Which of the following statements about gravitational force, Fa, is not correct?
The gravitational force between two objects depends on their separation
b Gravitational force is an attractive force only; it is never repulsive.
a.
C.
Gravitational forces always exist in pairs of equal magnitude.
d.
Gravitational force is the strongest of…
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Hi
Would like a little help with this question please. Thanks and appreciate your help.
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AR Review questions
DPres
range Tools Add-ons Help
Last edit was 42 minu.
Background Layout-
Theme
Transition
10
2N
If a student exerted a force on a toy train of 10 N, and the
force of friction provided 2 N of resistance, what would be
the net force acting on the train? Will the train accelerate,
and if so, in what direction?
Write your response here:
Balanced or unbalanced forces?:
Net Force on train:
Will train accelerate?
If so, In what direction?
r notes
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Answer question 2
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A docs.google.com
ADalucia 3RD PERIOD
I Cindy Nguyen- Force & Ms
AAR Review questions
DPresen
Arrange Tools Add-ons Help
Last edit was 41 minu.
Background
Layout-
| Theme
Transition
A car was traveling at constant speed of 40
mph, and then it slowed down as it
approached a stop sign. Does this scenario
represent balanced forces, unbalanced
forces, or both? Explain your answer.
STOP
Write your response here:
ker notes
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Answer the following with the correct letter.
1. Which law has this statement? “When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body”.
a. First Law
b. Second Law
c. Third Law
d. Law of Gravitation
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I have to submit within 13 minutes plz ASAP
Give proper explanation
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4. A student feels a gravity force of 800 N from the Earth when they're sitting in this classroom.
a. How big is the gravity force that the Earth feels because of the student? Explain.
b. Two students discuss part a)
Student 1: "The Earth is much heavier than the student, so its gravity must pull harder on the student than
the student's gravity pulls on the Earth. The gravity force the Earth feels must be less than 800 N."
Student 2: "That might be true, but I think that same 800 N would have less of an effect on the Earth than
it would on a person. Using a = F/m, the acceleration the Earth feels might be very small from an 800 N
force, because Earth is so heavy."
Which of these students, if any, do you agree with? Justify your response with words and/or equations.
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don't send plagiarise answer.
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Directions: Identify what law of motion is being shown in the following situations.
1. When an astronaut is drifting in space, he will travel at a constant speed in a
straight line forever if no force act on it.
2. Lighter vehicles accelerate faster than heavier vehicles.
3. When we walk on the ground, our foot pushes the ground backward, and as a
reaction, the ground pushes our foot forward.
4. When you push a cart, the cart pushes back against you.
5. Men in space find it more difficult to stop moving because of lack of gravity
acting against them.
6. Pulling a table cloth out under plates.
7. Two opposing team playing tug of war.
8. Firing a gun.
9. Hammering a nail.
10. When you are driving a car, and you hit the break and your body moved forward.
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please just say which option is right
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2. Part 2 - oPhysics Simulations
(i) The figure below, from oPhysics, shows a block being dragged across a rough surface by a
tension force T. The figure includes a free-body diagram. The red T, = T cos 0 and Ty = T sin 6
arrows are the horizontal and vertical components of the tension vector, respectively. Prove that
T1
cos 0 + µ, sin 0
where T is the tension required to just get the block moving if it starts from
rest.
ma
x: ma= TcostMng-7-
yi ma= Tsint-my
Ccast-Mmy)
n
T.
mg
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Two boxes of mass mp and ma connected together by a string slide on smooth
inclined planes as shown in Figure 1. Mass mp moves down while mass mo moves up
the planes.
i) Draw the free body diagram for mp and mo.
ii) Determine the acceleration of the system in terms of mp, ma, Op, Og and g.
iii) Determine the mass of ma that would keep the system at rest if Op = 30°, 0q = 20°
and mp = 4.0 kg.
%3D
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Two wooden boxes are moving on an inclined surface as shown in Figure 2.
Wooden
Box
A
Non- Frictional
Surface
Non- Frictional
Surface
60
Figure 2: Wooden Boxes
Answer the following questions uwing the D'Alembert's principle. Note that the mass of box A is M1 and
the mass of box B is M2.
1. Find the tension in the rope, in terms of M1 and M2.
2. Calculate the acceleration of the wooden boxes, in terms of M1 and M2.
Wooden
Box
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A very dedicated physics student decides to ride the elevator in Strode while standing on a scale. The student weighs 700 N. Determine the apparent weight the student reads on the scale for the following 3 situations:a. The elevator is accelerating upwards at 3 m/s^2.b. The elevator is moving upwards at 7 m/s. c. The elevator is accelerating downwards at 4 m/s^2.
Please include known values, a diagram, and implied values so I can better understand.
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Not sure how to complete this question
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See Attatchment
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Use the following information to answer the next question
You are standing on a scale inside of an elevator and you make one of the following
three observations.
Your scale reading is
1 less than your actual weight
2 equal to your actual weight
3 greater than you actual weight
Numeric Response
1. Match the number shown beside each observation above to the following
situations.
a) The elevator is moving upward at a constant speed of 5.0 m/s.
b) The elevator is accelerating upward at 3.0 m/s2.
c) The elevator is moving downward at a constant speed of 2.0 m/s.
d) The elevator is accelerating downward at 7.0 m/s?.
The values of a, b, c, and d are
your answer in the numerical response boxes provided.
_, and
Record all four digits of
Your answer:
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1. Make a sketch of how you think the acceleration vs. mass graph will look for carts with different masses released from rest from the top of an inclined track.
2. Do you think the acceleration of the cart increases, decreases, or stays the same as the mass of the cart increases? Explain your reasoning.
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1.)The original figure and requirement(s)
2.)Free body diagram with a complete label,
3.) Formulas and their proper symbols
4.) Direction of forces and sign convention.
The vertical and horizontal components must also be indicated on free body diagram.
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An object of mass m, placed on a frictionless horizontal table is connected to a string
that passes over a pulley and is fasten to another object of mass m2 as shown in
Figure 2. Ignore the mass of the string and pulley.
m,
m2
Figure 2
i)
Draw free-body diagrams of m, and m2.
ii)
Determine the acceleration of both objects and the tension in the string in terms
of m, m2 and acceleration due to gravity g.
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1. What quantity characterizes the inertia of a body?
2. What is the relationship between the mass of bodies and the accelerations they acquire during the interaction?
3. One body has a mass of 2 kg and another has a mass of 5 kg. How many times is one body more inert in relation to the other?
4. Explain in your words in which cases the method of determining mass is used:
a. through the interaction of bodiesB. by means of the balance.
5. What does it mean that the mass of a body has the property of additivity?
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From the choices below, Which of the following set of quantities affects the velocity of a free-falling object?
A. mass, time, gravitational acceleration
B. mass, time, elevation
C. weight, time, elevation
D. time, elevation, gravitational acceleration
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