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An 85 Newton box of apples is being pushed across a horizontal floor. As it moves, it is slowing at a constant rate of 0.90 m/s each second. The push force has a horizontal component of 20 Newton and a vertical component of 25 Newton downward.
Find coefficient of kinetic friction between floor and box?
A spherical source radiates sound uniformly in all directions. At a distance of 13 m, the sound intensity level is 80 dB. What power is radiated by this source
Jill ( 60kg) is swinging on a rope swing that is 4m long, at what frequency does Jill need to pump her legs to get the swing going higher
A model rocket rises with a constant acceleration to a height of 3.2m, at which point its speed is 26m/s. How much time does it take to reach this height
the coefficient of static friction for aluminum on steel is 0.61 and for copper on steel is 0.53. an aluminum block of
The body contains many small currents caused by the motion of ions in the organs and cells. how large is the current in the heart
Two blocks of masses m1 = 1.90 kg and m2 = 5.18 kg are each released from rest at a height of h = 5.15 m on a frictionless track, find the maximum height to which m1 rises after the collision
If 40 g of hot water at 80°C is poured into a cavity in a very large block of ice at 0°C, what will be the final temperature of the water in the cavity? Explain how much ice must melt in order to cool the hot water down to this temperature?
Suppose a heat engine pulls 3.37×104 J of work from the hot reservoir and 7.52×103 J of that energy is used to perform work. How much energy is rejected by the engine? (This energy is "exhausted" to the cold reservoir.) What is the efficiency of the ..
a hydroelectric turbine generator produces an electric power of 20 mwmegawatts. water enters the turbine penstock at
when we use the digital multi-meter dmm to measure the resistance a current is sent through the component we are trying
A rocket, away from all gravitational forces, accelerates upward at an acceleration of 12.8m/s^2. On its main deck is a crate with a mass of 81.6kg. a) How many forces act on the crate? b) Determine the Normal force on the crate, & c) What would the ..
An orchestra plays a loud symphonic passage at an intensity level of 72dB while a very soft solo is only 35dB. What is the intensity ratio for these two sounds?
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