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Vishal Gupta verified

Numerade educator

A 200 kg crate is moving across the level floor. The coefficient of kinetic friction is 0.95. What is the horizontal pushing force required to stop the crate from moving. If you were given the maximum frictional force to be 450 N, solve for the new coefficient.

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44. A 70-kg pole vaulter wishes to vault to a height of 6 meters. (a) Calculate the speed the given vaulter must attain to have the necessary kinetic energy. (b) Calculate the minimun amount of kinetic energy the vaulter needs to reach this height if air friction is neglected and all the vaulting energy is derived from Kinetic Energy.

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Benjamin Densmore verified

Numerade educator

If two objects with different mass collide and bounce off each other, the one with the lesser mass

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Emily Anderson verified

Numerade educator

It is easier to lift a brick one by one or to use a forklift, load them up, and move them? Explain in terms of the physics.

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finding the acceleration of a Crane

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Timothy James verified

Numerade educator

Explain the steps taken to find linear velocity going in a straight direction versus finding the velocity of a car making a turn. Explain.

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Dominique Jan Tan verified

Numerade educator

An object of mass m accelerates at a rate of a when the force of F acts on it. If the mass is increased to 1/3 m, the resulting acceleration will be: A. a/3 B. a/2 C. a D. 2a E. 3a

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Dominique Jan Tan verified

Numerade educator

A tennis ball is struck and departs from the racket of Dr. Jacome horizontally with a speed of 50 m/s. The ball hits the court at a horizontal distance of 50 m from the racket. How far above the court is the tennis ball when it leaves the racket?

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Dominique Jan Tan verified

Numerade educator

A 70-kg pole vaulter wishes to vault to a height of 6 meters. (a) Calculate the speed the given vaulter must attain to have the necessary kinetic energy. (b) Calculate the minimum amount of kinetic energy the vaulter needs to reach this height if air friction is neglected and all the vaulting energy is derived from Kinetic Energy.

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Gaurav Priyank verified

Numerade educator

A car is initially moving at 50 km/h along a straight highway. To pass another car, it speeds up to 140 km/h in 20 seconds at a constant acceleration. (a) How large was the acceleration in m/s 2 (b) How large was the acceleration, in units of g = 10 m/s 2 ?

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