A pumpkin of mass 5 kg shot out of a student-made cannon under air pressure at an elevation angle of 45° fell at a distance of 142 m from the cannon. The students used light beams and photocells to measure the initial velocity of 54 m/s. If the air resistive force was F = -kmv, what was the value of k?

( Done T A 10 kg bowling ball rolls down the lane with speed of 7.8 m/s and hits a 0.9 kg pin. The pin rolls away at 11.2 m/s. What is the new velocitv of the bowling ball after impact? Your Answer: Answer units Send To

A light plane flies north from Hamburg to Kiel (100 km) with an air speed of of 340 km/h through air. Compute the flight time without wind, with tail winds 80 km/h, and with winds from NNE of 80 km/h.

Neutron stars are what are thought to cause pulsars. A pulsar is an astronomical radio sourcethat emits pulses of radiation, as seen from earth. The regularity of the pulses initially causedthe discoverers Jocelyn Bell Burnell and Antony Hewish to speculate that the signals were fromanother civilization. The pulses were so regularly spaced that it was thought that pulsars couldbe used as a time standard. However, it was soon seen that the rate of pulse emission slows, butthen abruptly increases in events known as glitches. The current model (highly simplified) for a pulsar is a neutron star, one in which the electronshave been pushed down into the nucleuses by extreme gravitational forces to combine with theprotons to form neutrons. Material falling onto the surface of the neutron star gets superheatedand shoots off in the form of a jet. If the jet doesn’t coincide with the rotational axis of the star,the jet will precess around the axis. If the earth happens to lie on the cone of…