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PHY 250 Graded Exam 2- Attempt review SUMMER 2024 CA$36.62   Add to cart
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PHY 250 Graded Exam 2- Attempt review SUMMER 2024

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Which of the following is not correct? Select one: a. Work occurs when a force is applied to an object through so that the object is moved some distance. b. If a force is applied to an object but there is no displacement, then no work is done. c. The work done by gravity is always negative. d....

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  • June 19, 2024
  • 11
  • 2023/2024
  • Exam (elaborations)
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  • phy 250 graded exam 2 attempt review summer 2024

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Question 1Correct
6.00 points out of 6.00
Which of the following is not correct?
Select one:Work occurs when a force is applied to an object through so that the object is moved some distance.If a force is applied to an object but there is no displacement, then no work is done.The work done by gravity is always negative.The work done by a constant force is the product of the magnitudes of the parallel component of the force and the displacement.
Question 2Incorrect
0.00 points out of 6.00
Two identical masses are connected by a thin rod, as shown. About which point is the moment of inertia of the system the smallest?
Select one:x1x2x3There is not enough information.
Question 3Correct
6.00 points out of 6.00
A 1,450 kg car moves with a speed of 25 .0 m/s when it collides with a stationary car having a mass of 1,550 kg. The two vehicles lock bumpers on impact. The two cars then collide with a stationary third car of mass 1,250 kg. During this second impact, the third vehicle becomes attached to the second but the first car is breaks free and moves at 0 .125 m/s in the opposite direction. Which of the following is the final velocity of the second and third cars after the final collision?
Select one:a. 12.88 m/sb. 12.14 m/sc. 14.42 m/sd. 13.01 m/sStarted on Thursday, June 6, 2024, 7:31 PM
State Finished
Completed on Thursday, June 6, 2024, 8:24 PM
Time taken 53 mins 36 secs
Grade 132.00 out of 150.00 (88%)Page 1 of 9 Question 4Correct
6.00 points out of 6.00
A surveillance plane weighing 1.91 × 104 N is flying horizontally at a velocity of 59.4 m/s due west in thick clouds. Suddenly the plane is struck a glancing blow from another plane. Before impact, this smaller plane weighing 9 .74 × 103 N was traveling at 114 m/s due northwest at constant altitude. Immediately after impact, the second plane is knocked of course to a heading of 89.8 m/s at 35.2° north of west. Which of the following is the velocity of the surveillance plane after the collision?
Select one:61.1 m/s at 13.9° north of west64.8 m/s at 12.8° north of west61.1 m/s at 13.1° north of west64.8 m/s at 13.1° north of west
Question 5Correct
6.00 points out of 6.00
You are sparring in karate class. Your opponent, standing directly in front of you, throws a punch straight into your chest. What stance will best allow you to take this punch without losing your balance?
Select one: a.b.
c.
d.
Question 6Correct
6.00 points out of 6.00
Which of the following is a form of Hooke’s law, where Fs is a spring force?
Select one:Fs = −0.5xFs = –kxc. Fs = −0.5x2d. Fs = 0.5kx2
Question 7Correct
6.00 points out of 6.00
When applied to a system, a nonconservative force.
Select one:generates a potential energy within the system.lifts an object above its original height.cannot generate potential energy with the system.lowers the object below its original height.Page 2 of 9

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