Assume that a machine puts out 8000 joules of work when the user puts in 10,000 joules of work. What is the efficiency of the machine?

A mouse runs along a baseboard in your house. The mouse's position as a function of time is given by x (t) = pt 2+qt, with p = 0.36 m/s2and q = - 1.10 m/s. Determine the mouse's average speed between t = 1.0 s and t = 4.0 s.

Two objects are dropped from different heights at the same instant. If the first object takes 10.7 seconds to hit the ground and the second takes 14.8 seconds what was the difference in their original heights?

A bag of books took 3 minutes to move. You did 12,900 J of work. How much power was required to move the bag?

How long would the night be on June 21 in Fairbanks, Alaska?

When a 12.0-V battery causes 2.00 μC of charge to flow onto the plates of an air-filled capacitor, how much work did the battery do?

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass

Drivers are able to see objects ahead of them because light travels through windshields.