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The Zacchini family was renowned for their human cannon ball act in which a family member was shot from a cannon using either elastic bands or compressed air. In one version of the act, Emanuel Zacchini was shot over three Ferris wheels to land in a net at the same height as the open end of the cannon and at a range of 65 m. He was propelled inside the barrel for 5.3 m and launched at an angle of 48°. If his mass was 84 kg and he underwent constant acceleration inside the barrel, what was the magnitude of the force propelling him? (Hint: Treat the launch as though it were along a ramp at 48°. Neglect air drag.)
jose is looking to the east. lightning bolt 1 strikes a tree 300 m from him. lightning bolt 2 strikes a barn 900 m from
A spring lies on a horizontal table, and the left end of the spring is attached to a wall. Determine how far can the spring be stretched from its unstrained position without the box moving when it is released
a 3-kg object attached to a spring oscillates on a smooth horizantial surface. its position versus time is given by the
a motorist driving a 1000-kg car wishes to increase her speed from 20 ms to 30 ms in 5 s. determine the horsepower
A shaving mirror is a concave mirror used to give someone a close up view of their face. how far is the man's face from the mirror
a swimming pool is 20.0 m long and 15.0 m wide. Itis filled with water to a uniform depth of 4 meters. find the total (absolute) pressure on the bottom of the pool
The first and second electron shells of an element are filled and there are five electrons in the third electron shell
What is the efficiency of a cyclical heat engine in which 65.0 kJ of heat transfer occurs to the environment for every 95.0 kJ of heat transfer into the engine
A slide projector has a lens of focal length 150. mm. An image 100. cm × 100. cm is formed of a slide whose dimensions are 50.0 mm × 50.0 mm
A water collector on a farm roof 5m high from the ground overflows with rain through a large circular are of radius 1.2m. The water then falls through a pipe and into a tub near the ground; it exits the pipe through a .3m radius spout located .5m fro..
A hot iron horseshoe (mass = 0.50kg ), just forged, is dropped into 1.50L of water in a 0.30kg iron pot initially at 25.0?C. estimate the initial temperature of the hot horseshoe
A transformer has 450 turns in its primary coil and 30 turns in its secondary coil. Which one of the following statements concerning this transformer is true? This is a step-up transformer. The turn’s ratio is 15 for this transformer.
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