Walden Physics Worksheet

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QUESTION 1
3 points
How many significant figures are in the number 505.200?
O 3
04
05
O 6
QUESTION 2
3 points
Which of the following is a Vector?
O Speed
Kinetic Energy
O Momentum
O Distance
QUESTION 3
3 points
What is the acceleration of an airplane flying at a constant speed of 240 m/s for 4 minutes?
O 0 m/s2
о
6 m/s2
60 m/s2
1 m/s2
3 points
QUESTION 4
People are being evacuated out of a building. The ladder that firefighters place against the building makes an angle of 56 degrees with the ground and is 20 feet away from the base of the building. Which of the following
represents the length of the ladder?
O 20 sin(56)
O 20 tan (56)
O 20 cos (56)
O 20 sin (56)
QUESTION 5
3 points
What is the direction of the acceleration in the x-axis of an object undergoing projectile motion?
Not enough information to tell.
In the same direction the object is moving in (positive).
O Opposite the direction the object is moving in (negative).
There is no acceleration.
QUESTION 6
3 points
Which of the following is the best statement about mass and weight? (only one answer)
O Mass and weight are the same numerical value on Earth.
O Weight is a force while mass is a measurement of the quantity of matter.
O The magnitude of weight is independent of gravitational acceleration while the magnitude of mass is dependent on gravitational acceleration.
O Both A and B are correct.
QUESTION 7
3 points
A 35 kg crate is pushed across a flat stretch of (frictionless) ice with a horizontal force of 70 N. If that force is doubled what happens to the normal force on the crate?
O It stays the same.
O The normal force increases
O The normal force decreases.
O There’s not enough information to tell.
QUESTION 8
3 points
What is the difference between Kinetic Friction and Static Friction?
O One describes the potential energy stored in an object and the surface it’s on, while the other describes the energy of the object as it’s sliding or rolling
O One describes the force required to be overcome for sliding or rolling to begin, while the other the force between two things as one sliding or rolling.
O One is for an object that is sliding, while the other is for an object that is rolling.
O One is the maximum force that can be achieved between two objects, while the other is the minimum force that is required between two objects.
QUESTION 9
3 points
Which one of the following statements about the gravitational force is TRUE?
You exert the same magnitude of gravitational force on the Earth as it exerts on you.
O The gravitational force only acts between very massive objects
Doubling the distance between two objects halves the force due to gravity.
O Astronauts in the International Space Station are completely free of gravity because they are above the atmosphere.
QUESTION 10
3 points
What Conservation Law connects Hooke’s Law to the Work-Energy Principle?
O Conservation of Momentum.
O Conservation of Forces.
O Conservation of Mechanical Energy.
O Conservation of Work.
QUESTION 11
3 points
Which one of the following statements about Potential Energy is FALSE?
O Potential energy is the energy stored in an object due to its position.
O An object in motion cannot have potential energy.
If the mass of an elevated object is doubled, the gravitational potential energy will also be doubled.
O Potential energy is a scalar.
QUESTION 12
3 points
Which of the following is an example of an Elastic Collision?
O A football player catching a football in the endzone.
O An arrow being fired into a target.
O A big fish eating a smaller fish.
Air molecules colliding with each other.
QUESTION 13
3 points
An athlete performs a high jump, bending their knees as they land. This increases the time of impact, thus resulting in what?
O No measurable difference.
O A faster transfer of momentum.
O Alarger average force.
O A smaller average force
QUESTION 14
3 points
Which horse on a merry-go-round is traveling with the highest linear velocity?
None, they all move at the same speed.
O The one located near the center
O The one located halfway between the center and the edge
O The one located along the outer edge.
QUESTION 15
3 points
A spinning figure skater extends a leg outward while reaching out in the other direction, thereby increasing their moment of inertia. Assuming angular momentum is conserved, what happens to their rotational kinetic energy?
It stays the same.
O It increases.
O It decreases.
O Not enough information to tell.
QUESTION 16
3 points
If an object has constant acceleration, it will have exponentially increasing displacement
True
O False
QUESTION 16
3 points
If an object has constant acceleration, it will have exponentially increasing displacement.
True
O False
QUESTION 17
3 points
Astronauts have less mass on the moon
O True
O False
QUESTION 18
3 points
I pull a box attached to a rope across the room. The tension of the rope would be considered conservative while the friction between the box and the floor would be nonconservative
O True
O False
QUESTION 19
3 points
While making a snowman, I push a ball of snow up a hill with an 18 degree incline. Because the force l exert on the snow ball is in the same direction as the snow ball’s motion, I would be doing more work on the snow ball than
the work done by the force due to gravity.
True
O False
QUESTION 20
3 points
An object with zero velocity can still have momentum.
O True
O False
QUESTION 21
10 points
Please complete only TWO of the following four File Response Questions. Don’t forget to upload a file of your work for credit on these questions. If more than two are completed, only the first two will be graded.
Tony Hawk skateboards off a ramp, flying into the air at an initial angle of 23 degrees.
A) (4 points) If the x-component of the initial velocity is 5.4 m/s, what was his initial velocity?
B) (4 points) What was the y-component of the initial velocity?
C) (6 points) What was Tony Hawk’s maximum height?
D) (6 points) Assuming that he lands back on the ground at the same height of the top of the ramp. how long was he in the air?
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QUESTION 22
10 points
Please complete only TWO of the following four File Response Questions. Don’t forget to upload a file of your work for credit on these questions. If more than two are completed, only the first two will be graded.
The European Space Agency (ESA) and NASA jointly launched a satellite to monitor the Sun called the “Solar Orbiter”.
*Note: The Sun has a mass of 1.989 x 1030 kg
A) (12 points) What is the Solar Orbiter’s linear velocity if it’s 1.64 x 104 km away from the Sun?
B) (8 points) If the Force due to gravity from the sun on the Solar Orbiter is 3.58 x 1010 N when it got that close in part A, what is it’s mass?
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QUESTION 23
10 points
Please complete only TWO of the following four File Response Questions. Don’t forget to upload a file of your work for credit on these questions. If more than two are completed, only the first two will be graded.
Spider man has a mass of 88 kg and starts at a height of 16.4 meters when he goes into a straight dive.
A) (3 points) Calculate the total energy in the system.
A() .
B) (5 points) Spider man creates a web net that’s 3.1 meters off the ground. How fast is Spider man going just before he touches the net?
C) (8 points) If the web net stops Spider man 0.2 m above the ground, what is the webbing’s spring constant, K?
D) (4 points) The human body can survive no more than 9 g’s of force. What is the force that the web net would exert on Spider man? Will he survive the fall or not?
D) . ? ?
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QUESTION 24
10 points
Please complete only TWO of the following four File Response Questions. Don’t forget to upload a file of your work for credit on these questions. If more than two are completed, only the first two will be graded.
A secret agent dangles from a plane that maintains a constant altitude and speed. The agent has a mass of 72.8 kg and makes an angle of 69.1 degrees to the horizontal as they hang from the plane.
A) (8 points) Calculate the Tension,
B) (8 points) Calculate the agent’s acceleration.
C) (4 points) The secret agent bumps the top of a tree that the plane is flying over. The collision lasts a total of 0.34 seconds, what is the impulse from the collision?
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