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A horizontal force F is used to pull a 5 kg block across a floor at a constant speed of 3 m/s. The frictional force between the block and the floor is 10 N. The work done by the force F in 1 minute is most nearly

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6 years ago

Date created

Mar 1, 2020

Cards (25)

Section 1

(25 cards)

A horizontal force F is used to pull a 5 kg block across a floor at a constant speed of 3 m/s. The frictional force between the block and the floor is 10 N. The work done by the force F in 1 minute is most nearly

Front

1,800 J

Back

What is the speed of the object at t=3 seconds?

Front

3 m/s

Back

A point charge Q1 = +8.0 µC is placed at point -2 m. A second charge Q2 is placed at point +3 m. The net electric field at the origin is zero. What is charge Q2?

Front

18.0 µC, Positive

Back

A driver in a 1500 kg sports car wishes to pass a slow moving truck on a two lane road. What is the average power in watts required to accelerate the sports car from 20 m/s to 40 m/s in 9 seconds?

Front

300,000 W

Back

A solid conducting sphere is given a positive charge Q. How is the charge Q distributed in or on the sphere?

Front

It is uniformly distributed on the surface of the sphere only.

Back

A construction laborer holds a 20 kilogram sheet of wallboard 3 meters above the floor for 4 seconds. During these 4 seconds how much power was expended on the wallboard?

Front

0 watts

Back

Charges + Q and - 4Q are situated as shown above. The net electric field is zero nearest which point?

Front

A

Back

Does the centripetal force acting on an object do work on the object?

Front

no, the force and displacement of the object are perpendicular

Back

A force moves an object in the direction of the force. The graph to the right shows the force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

Front

20 J

Back

If the net work done on an object is zero, then the object's kinetic energy A. decreases.

Front

remains the same

Back

A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the total work done by the deliveryman on the cartons to move them to the loading dock?

Front

3750 J

Back

You slam on the brakes of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

Front

It would have skidded 4 times farther

Back

Two isolated charges, + q and - 2q, are 2 centimeters apart. If F is the magnitude of the force acting on charge -2Q, what are the magnitude and direction of the force acting on charge + q?

Front

F,Toward charge - 2q

Back

The speed of the ball at point II is most nearly

Front

4.5 m/s

Back

What is the change in momentum of the object after 6 seconds?

Front

30 N-s

Back

What is the direction of the net force on charge C due to charges A and B?

Front

^ I

Back

Two positive charges of magnitude q are each a distance d from the origin A of a coordinate system as shown right. At which of the following points is the electric field least in magnitude?

Front

A

Back

A physics student is standing on an icy pond in her ice skates. The ice has very little friction and she needs to move to the north shore of the pond, and is having trouble moving. She has a very heavy physics book in her arms and decides to throw it parallel to the ice. Which way should she throw it to enable her to get closer to the north shore, and which physics principle explains what happens after the book is thrown?

Front

South; Conservation of Momentum

Back

Ball 1 of mass m travels at a velocity of v m/s south and collides with Ball 2 of mass 3m which is travelling at a velocity of v/2 north. If the final velocity of ball 1 is v/4 north, what is the final velocity of ball 2?

Front

v/12 north

Back

A pickup truck is being driven down the highway. It starts raining and rain begins filling up the back of the truck. If the driver maintains the same pressure on the gas pedal, and the road stays flat and level, what happens to the velocity of the truck and which conservation law applies?

Front

Decreases; Conservation of Momentum

Back

In the circuit shown above, what is the potential difference between points X and Y if the 12V battery has no internal resistance?

Front

6V

Back

The velocity of a moving bicycle is doubled. Which of the following quantities must also be doubled?

Front

Momentum

Back

If you push twice as hard against a stationary brick wall, the amount of work you do

Front

remains constant at zero

Back

Two identical conducting spheres are charged to +2Q and -Q. respectively, and are separated by a distance d (much greater than the radii of the spheres) as shown above. The magnitude of the force of attraction on the left sphere is F1. After the two spheres are made to touch and then are re-separated by distance d, the magnitude of the force on the left sphere is F2. Which of the following relationships is correct?

Front

F1 = 8 F2

Back

If the potential energy is zero at point II, where will the kinetic and potential energies of the ball be equal?

Front

At point III

Back