A proton undergoes an acceleration of 2.00 × 107 ms2 for 3.00 ms before being released into a magnetic field. In the field, the proton travels a circular path of radius 1.00 cm at a constant speed. How long does it take for the proton to travel around the circular path three and a half times? What is the average velocity of the proton for the circular part of this motion?

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

By what primary heat transfer mechanism does the sun warm the earth?

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%