Wednesday
July 23, 2014

Posts by britches


Total # Posts: 20

physics
The actual speed of electrons drifting along in a common electric circuit is about the speed of which of the following?. A) sound.B) a fast-moving automobile.C) light.D) a slow-moving snail.

physics
As more branches are added to a parallel circuit, the overall resistance of the circuit does which of the following?. A) remains the same.B) definitely decreases.C) definitely increases.D) may increase.E) may decrease.

physics
Consider an ideal pulley system. Pull one end of a rope downward by 1 meter with 50 N of force, and you'll lift a 200-N load a distance of ____________________. A) 1 meter. B) 0.5 meter. C) 0.25 meter. D) None of these.

physics
Part A A 3.00 kgblob of putty moving at 2.4 m/s slams into a 4.80 kg blob of putty at rest. Calculate the speed of the two stuck-together blobs of putty immediately after colliding.

physics
5. An object that has kinetic energy must have ____________________. A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these.

physics
An object that has kinetic energy must have which of the following?A) momentumB)acceleration c all of these d none of these

principles of physics
Calculate the change in potential energy of 7.8 million kg of water dropping 50 m over Niagara Falls.

physics
How many joules of potential energy does a 1.5 kg book gain when it is elevated 4.2 m?

physics
Calculate the watts of power expended when a force of 1.8 N moves a book 2.0 m in a time interval of 1.0 M/S

physics
Consider an ideal pulley system. Pull one end of a rope downward by 1 meter with 50 N of force, and you'll lift a 200-N load a distance of ____________________. A) 1 meter. B) 0.5 meter. C) 0.25 meter. D) None of these.

physics
6. You have kinetic energy when you run. If you run three times as fast, you'll have a kinetic energy ____________________. A) 3 times as much. B) 6 times as much. C) 9 times as much. D) that is the same. E) None of these.

physics
Consider an ideal pulley system. Pull one end of a rope downward by 1 meter with 50 N of force, and you'll lift a 200-N load a distance of ____________________. A) 1 meter. B) 0.5 meter. C) 0.25 meter. D) None of these.

physics
5. An object that has kinetic energy must have A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these.

physics
5. An object that has kinetic energy must have A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these.

physics
Which requires more power? lifting a 25 kg bag of cement 10 m vertically in 1 minute, or lifting a 50 kg bag 5?

principles of physics
A truck moves with a certain momentum. If both its speed and its mass are doubled, how much greater is its momentum? A) Two times. B) Four times. C) Eight times. D) Unchanged, the same.

principles of physics
A fast-moving massive car has a head-on collision with a slow-moving light car. Upon which is the impulse greater? A) The massive car. B) The light car. C) Impulse is the same on both. D) More information is needed to correctly answer this.

principles of physics
6. A cannon with a long barrel fires a shell faster because the shell experiences a greater ____________________. A) change in inertia. B) impulse. C) acceleration. D) None of these.

principles of physics
7. If superman in space throws a boulder with 10 times as much mass as himself, and the boulder leaves his hands at 100 m/s, how fast does superman recoil? A) 1000 m/s. B) The same speed, 100 m/s. C) 10 m/s. D) None of these are correct.

principles of physics
Two identical gliders slide toward each other on an air track. One moves at 2 m/s and the other at 1 m/s. If they stick together, the combination slides at ____________________. A) 0.5 m/s. B) 1 m/s. C) 1.5 m/s D) 2 m/s E) 2.5 m/s.

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