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(a) Calculate the retarding force due to the viscosity of the air layer between a cart and a level air track given the following information--air temperature is , the cart is moving at 0.400 m/s, its surface area is , and the thickness of the air layer is . (b) What is the ratio of this force to the weight of the 0.300-kg cart?

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Rochelle Enrera
Rochelle EnreraLv10
6 Jan 2021

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Part A
A cart on an air track is moving at 0.5m/s when the air is suddenly turned off. The cart comes to rest in 1m. The experiment is repeated with the cart moving at 1 m/s when the air is turned off. How far does the cart travel before coming to rest?
a) 1 m
b) 2 m
c) 3 m
d) 4 m
Part B
A 4 kg mass with a speed of 2m/s and a 2kg mass with a speed of 4m/s are gliding over a horizontal frictionless surface. Both objects encounter the same horizontal force, which opposes their motion, and are brought to rest. Which statement best describes their stopping distance?
a) the 4 kg mass travels twice as far as the 2 kg mass before stopping.
b) the 2 kg mass travels twice as far as the 4 kg mass before stopping.
c) both masses have the same stopping distance.
d) the 2 kg mass travels farther, but not necessarily twice as far.

James and Sarah stand on a stationary cart with frictionlesswheels. The total mass of the cart and riders is 130 kg. At thesame instant, James throws a 1.0 kg ball to Sarah at 4.5 m/s, whileSarah throws a 0.50 kg ball to James at 1.0 m/s. James’s throw isto the right and Sarah’s is to the left.

Part A: While the two balls are in the air, what is the speed ofthe cart and its riders?

Part B: While the two balls are in the air, what is the directionof the cart and its riders? (Choices are left, or right)

Part C: After the balls are caught, what is the speed of the cartand riders?

Part D: After the balls are caught, what are the direction of thecart and riders?
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Suppose a cart of mass m = 478 g is initial moving at speed v0 =4.76 m/s. It strikes a spring attached to a fixed wall, comes to astop, and bounces back at speed vf = 2.95 m/s. Assume the track isfrictionless.

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I got 1.41 N*m which was wrong and I'm stuck at a dead end.

b) Find the energy lost in this collision.


c) If the cart was in contact with the spring for 450 ms, find theaverage force exerted by the spring on the cart.

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