13. A 4.00 kg mass sliding on a frictionless horizontal platform had a velocity of 5.00 m s' due north. 6.00 s later, it was found to be moving due north with a velocity of 7.00 m s* '. The average net external force that acted upon it during this time interval was: 1.33 N due north - 3.33 N due south 4.33 N due north 8.00 N due north A B D

13. A 4.00 kg mass sliding on a frictionless horizontal platform had a velocity of 5.00 m s' due north. 6.00 s later, it was found to be moving due north with a velocity of 7.00 m s* '. The average net external force that acted upon it during this time interval was: 1.33 N due north - 3.33 N due south 4.33 N due north 8.00 N due north A B D

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Description: 13.A 4.00 kg mass sliding on a frictionlesshorizontal platform had a velocity of 5.00 ms' due north. 6.00 s later, it was found to bemoving due north with a velocity of 7.00 m s''. The average net external force that actedupon it during this time in

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter5: Newton's Law Of Motion

Section: Chapter Questions

Problem 94CP: A 10.0-kg object is initially moving east at 15.0 m/ s. Then a force acts on it for 2.00 s, after...

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A 10.0-kg object is initially moving east at 15.0 m/ s. Then a force acts on it for 2.00 s, after which it moves northwest, also at 15.0 m/s. What are the magnitude and direction of the average force that acted on the object over the 2.00-s interval?
What force does a trampoline have to apply to a 45.0-kg gymnast to accelerate her straight up at 7.50 m/s2? Note that the answer is independent of the velocity of the gymnast—she can be moving either up or down, or be stationary.
A 10.0-kg object is initially moving east at 15.0 m/s. Then a force acts on it for 2.00 s, after which it moves northwest, also at 15.0 m/s. What are the magnitude and direction of the average force that acted on the object over the 2.00-s interval?
A 3.00-kg object is initially moving northward at 15.0 m/s. Then a force of 15.0 N, toward the east, acts on it for 3.70 s. What is the direction of the final velocity? Enter the angle in degrees where positive indicates north of east and negative indicates south of east.
What force does a trampoline have to apply to Jennifer, a 45.0-kg gymnast, to accelerate her straight up at 7.50 m/s2 ? The answer is independent of the velocity of the gymnast—she can be moving up or down or can be instantly stationary.
A 821-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 30.0 m/s. What is the average force exerted on the car during this time?
A freight train consists of two 8.00×104-kg enginesand 45 cars with average masses of 5.50×104kg . (a) What force must each engine exert backward on the track toaccelerate the train at a rate of 5.00×10–2 m/s2if the force of friction is 7.50×105 N , assuming the engines exertidentical forces? This is not a large frictional force for such amassive system. Rolling friction for trains is small, andconsequently trains are very energy-efficient transportationsystems. (b) What is the force in the coupling between the37th and 38th cars (this is the force each exerts on the other),assuming all cars have the same mass and that friction isevenly distributed among all of the cars and engines?
A 934-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 35.0 m/s. What is the average force exerted on the car during this time? kN eastward
A 3.00-kg object is moving in a plane, with its x and y coordinates given by x = 5t^2 -1 and y = 3t^3+ 2, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t = 2.00 s. Answer: 112 N
Paleontologists estimate that if a Tyrannosaurus rex had tripped and fallen, the ground would have exerted anormal force of approximately 260,000 N on its torso as it landed.Assuming the torso has a mass of 3800 kg, (a) find the magnitudeof the torso’s upward acceleration as it comes to rest. (For comparison, humans lose consciousness with an acceleration of about 7g.)(b) Assuming the torso of a T. rex is in free fall for a distance of 1.46m as it falls to the ground, how much time is required for the torsoto come to rest once it contacts the ground?
A 0.160-kg hockey puck is moving on an icy, frictionless, horizontal surface. At t = 0, the puck is moving to the right at 3.00 m/s. (a) Calculate the velocity of the puck (magnitude and direction) after a force of 25.0 N directed to the right has been applied for 0.050 s. (b) If, instead, a force of 12.0 N directed to the left is applied, how long would it take to stop the puck?
2.A dockworker applies a constant horizontal force of 80.0 N toa block of ice on a smooth horizontal floor. The frictional force is negligible.The block starts from rest and moves 11.0 m in 5.00 s. (a) What isthe mass of the block of ice? (b) If the worker stops pushing at the endof 5.00 s, how far does the block move in the next 5.00 s?