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In 1656, the Burgmeister (mayor) of the town of Magdeburg, Germany, Otto Von Guericke, carried out a dramatic demonstration of the effect resulting from evacuating air from a container. It is the basis for this problem. Two steel hemispheres of radius 0.380 m (1.25 feet) with a rubber seal in between are placed together and air pumped out so that the pressure inside is 11.00 millibar. The atmospheric pressure outside is 970 millibar. Calculate the force required to pull the two hemispheres apart. Two equal teams of horses, are attached to the hemispheres to pull it apart. If each horse can pull with a force of 1390N (i.e., about 312 lbs), what is the minimum number of horses required? Also What would the units be for part 1 and part 2.
The longest "string" (a thick metal wire) on a particular piano is 3.0 m long and has a tension of 300.0 N. What is the total mass of the wire
An object sits on a wheel 0.30 m from its axle. The wheel's rotational speed decreases from 4.0 rad/s to 2.0 rad/s in 5.0 s. determine the wheel's average rotational acceleration
Visitors at a science museum are invited to sit in a chair to the right of a full-length diverging lens (f1 = -2.94 m), Find the overall magnification of the friend when viewed through both lenses
A 125 kg mail bag hangs by a vertical rope 3.3 m long. A postal worker then displaces the bag to a position 2.2 m sideways from its original position, What horizontal force is necessary to hold the bag in the new position
As a spacecraft approaches a planet, the rocket engines on it are fired (turned on) to slow it down so it will go into orbit around the planet. compute how long (in minutes) must the engines be fired
Two conductors having net charges of + 10.0 µC and - 10.0 µC have a potential difference of 10.0 V between them. (a) Determine the capacitance of the system. (b) What is the potential difference between the two conductors if the charges on each ar..
A ball is dropped from the top of a 6.10m tall building, falls straight downward, collides inelastically with the ground and bounces back up. How many bounces can the ball make
A ball (m= .450 kg) is placed at the top of a ramp 1.00 m high. what is the ball's velocity at the bottom of the ramp
One mole of neon gas is heated from 364 Kto 410K at constant pressure. Calculate the change in the internal energy of the gas
An automobile radiator is filled to the brim with 45 liters of glycerin coolant at 10 degrees C. How much glycerin overflows from the radiator as a result of expansion
Suppose a cube of aluminum which is 1.00 cm on a side accumulates a net charge of +2.30 pC. By what percentage has the mass of the cube decreased
Your nephew swings a rock around his head on a massless string. If the string is 1.5 m long and is 12?degrees from the vertical, what is the period of the rock
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