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A 75 kilogram stunt boy jumps from a balcony and falls 25 meter before colliding with a pile of mattresses. If the mattresses are compressed 1.00 meter before he is brought to rest, find the average force exerted by the mattresses on the stunt boy?
In a pairs figure skating competition, a 65 kg man and his 45 kg female partner stand facing each other on skates on the ice. what is the velocity of her partner
Calculate the concentration (in moles/m^3) of oxygen in air (21%oxygen) assuming it acts as an ideal gas at 21oC. What is the rms speed for such a molecule
Take element Z = 21 from the periodic table. Ionize it 20 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the electron
The top of a swimming pool is at ground level. If the pool is2.20 m deep, how far below ground leveldoes the bottom of the pool appear to be located for the following conditions?
A cooling fan is turned off when it is running at 850rev/min. It turns 1500 revolutions before it comes to astop. What is the fan's angular acceleration
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1000 Hz. What is the speed of the bird
A square loop of wire surrounds a solenoid. The side of the square is 0.1 m, while the radius of the solenoid is 0.025 m. What is the current flowing in the square loop
290 Kg piano slides 4.0 m down a 30 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is .40.
The plates of a parallel-plate capacitor are 3.50mmapart, and each carries a charge of magnitude 75.0nC, What is the area of each plate
A piece of balsa wood of 0.3 g/cm3 is released after being completely submerged underwater. What is the magnitude of the initial acceleration of the wood
as per the sign convention that we follow in this class if an electric motor is considered as a control volume then the
A cheetah is after its prey, which has a mass that is one-half that of the cheetah. When both start from rest, the cheetahsustains 2.50 times the acceleration as does its prey in the same time period.
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