Jonathan is riding a bicycle and encounters a hill of height 7.30 m. at the base of the hill, he is traveling at 6.00 m/s. when he reaches the top of the hill, he is traveling at 1.00 m/s. jonathan and his bicycle together have a mass of 85.0 kg. ignore friction in the bicycle mechanism and between the bicycle tires and the road. (a) what is the total external work done on the system of jonathan and the bicycle between the time he starts up the hill and the time he reaches the top? (b) what is the change in potential energy stored in jonathan’s body during this process? (c) how much work does jonathan do on the bicycle pedals within the jonathan-bicycle-earth system during this process?

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

You and a friend (alex) are at a a tree-top adventure park .. . part of the course requires you to climb up a rope. you both climb the same rope in the same amount of time. however, the tension in the rope is greater when alex climbs. who did the most work? alex did - more tension means more force - more force means more work was done you did - less tension means less force - less force means more work was done to find the work done, the force exerted and distance moved are multiplied. a couch is moved twice before you are happy with its placement. the same force was used to move the couch both times. if more work is done the first time it is moved, what do you know about the distance it was moved? when more work was done, the couch was moved less. when more work was done, the couch was moved further. when more work was done, the couch wasn't moved at all. when more work was done, the couch was moved the same distance.

Use the information presented in the graph to answer the questions. which segments show acceleration? which segment indicates that the object is slowing down? what is the velocity of segment b? what is the acceleration of segment b?