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A 24 kg girl slides down a playground slide that is 29 m high. When she reaches the bottom of the slide, her speed is 1.3 m/s. (a) how much energy was dissipated by friction? [ ] J (b) if the slide is inclined at 20 degree, what is the coefficient of friction among the girl and the slide?
find the tangential and centripetal components of the net force exerted on a car (by the ground) when its speed is 38 m/s, and it has accelerated to this speed from rest in 9.5 s on a curve of radius 370 m. The car's mass is 1000 kg.
A 0.14-kg balloon is filled with helium (density = 0.179 kg/m3). If the balloon is a sphere with a radius of 5.3 m, what is the maximum weight it can lift
A husband buys a helium-filled anniversary balloon for his wife. The balloon has a volume of 4.3L in the warm store at 76?F. By how much has the volume decreased in liters
An elevator has mass 540 , not including passengers. The elevator is designed to ascend, at constant speed, a vertical distance of 19.5 (five floors) in 16.2 , What is the maximum number of passengers that can ride in the elevator
A ladder is leaning on a frictinoless wall. A painter climbsup 70% of the ladder. Find the coefficient of friction that holds the ladder at its place
assume a charge starts at rest on an equipotential surface, is moved off that surface, and then is eventually returned to the same surface at rest after a round trip. How much work did it take to do this? Explain.
A liter of water has a mass of 1 kg and the mass of a water molecule is 18 amu. How many molecules of water are there in 2 L of water
A 1000 kg boat moves through the water with two forces actingon it. One is a 3000 N forward push by the water on the propellor,and the other is an 2400 N resistive force due to the water aroundthe bow.
Assuming that the earth is of uniform density inside, find the kinetic energy of the earth due to its yearly motion around the sun. Assuming that the earth is of uniform density inside, find the kinetic energy of the earth due to its daily spin on i..
Use the Hubble law, the apparent visual magnitude of +12.9 and the observed redshift z = 0.158 to estimate the absolute magnitude of the quasar 3C 273 (which is the brightest quasar known). Compare the luminosity of 3C 273 with that of the Androme..
an improved version of a model of radioactive is to toss a large number of dice instead of coins: each has die that comes up a "one" represent a nucleus that has decayed. what is the half-life in numbers of tosses
A small ball is set in horizontal motion by rolling it with a speed of 5.00 m/s across a room 10.0 m long, Select the reason why the motion is periodic
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