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A 50kg object is sitting on top of a pistion that is supported by a cushion of air in a cylinder. The radius of the piston is 1 m.
a) In order to support this weight, how much force is needed?b) What does the air pressure inside of the cylinder have to be in order to produce enough force to support the weight?c) If you added 5 kg more to the mass on the piston, assuming that the temperature remains constant, what would be the change in height of the piston?
The magnetic field of an electromagnetic wave in a vacuum is Bz = ( 3.5 muT) sin ( 1.6×10^7 x - 2pi f t) , What is the wave's electric field amplitude
What is the response to the Naturalist concept that human personality, thought, and emotion are purely chemical and electrical reactions.
Suppose a toy oscillated with a frequency of 500 Hz and hence a period of 0.002s. If the toy moves past an observer at 0.9c, what is the frequency as measured by the observer?
A lead pellet with a mass of 0.519 g is shot from an air gun at a speed of 118 m/s. It is stopped by a boulder. What is the temperature change of the bullet
A car of mass 2200 kg collides with a truck of mass 4800 kg, and just after the collision the car and truck slide along, stuck together. find the velocity of the stuck-together car and truck just after the collision
the only force acting on a 2.0 kg canister that is moving in an xy plane has a magnitude of 5.0 n. the canister
A 20.0 kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that is hinged to a pole. A cable at an angle of 30.0 degrees with the beam helps support the light. Find (A) the vertical component of the force exerte..
A weightlifter bench-presses a 130.0 kg barbell from his chest to a height equal the length of his arms 0.850 m. How much work does he do? What is the potential energy of the barbell relative to the weightlifter\'s chest after he lifts the barbell
An 83.0kg student, starting from rest, slides down a 11.8m highwater slide. How fast is he going at the bottom of the slide
One end of a 68-cm-long copper rod with a diameter of 2.4cm is kept at 480?C, and the other is immersed in water at 24?C. Calculate the heat conduction rate along the rod
A thin layer of magnesium fluoride (n = 1.38) is used to coat a flint-glass lens (n = 1.61). What atleast thickness should the magnesium fluoride film have if the reflection of 669 nm light is to be suppressed? suppose that the light is incident a..
sound travels at a speed of v1539 ms in water. while underwater a student hears a v 3.5 khz whale song. what is the
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