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A 45-kg crate slides to the left initially at a speed of 5.2 m/s. A rope pulls on it with a tension of 240 N in a direction 35 degrees above the horizontal to the right. The coefficient of kinetic friction between the crate and the floor is 0.55. What is the acceleration of the crate? How much time is required to bring the crate to a stop?
a car traveling due east at 20 m/s reverses its direction over a period of 10 seconds so that it is traveling due west at 20 m/s. What is the direction of the car's average acceleration over this period?
Suppose the Eskimo is pushing the same 50.0-kg sled across level terrain with a force of 50 N. If he does 4 x 10^2J of work on the sled while exerting the force horizontally, through what distance must he have pushed it.
Compute the change in entropy of 1 gram of water as it goes from solid ice at 0 celsius to water vapor at 100 Celsuis
A car is traveling 72.0 km/h when the driver applies the brakes. If if car slows down uniformly with an acceleration of -4.5 m/s2, how far does the car travel before coming to rest.
Suppose a bat chirp has a frequency of 29 kHz. How fast would the bat have to fly, and in what direction, for you to just barely be able to hear the chirp at 19 kHz
A baseball is bunted down the third-base line leaving the bat from a height of 0.800m with an initial velocity of 8.00m/s at an angle 30 degrees above the horizontal. What is the speed of the ball just before it hits the ground
Light traveling in water strikes the boundary between two mediums at an angle of 35 degrees. what is the wavelength of the refracted light traveling at 1.85x10^8m/s
A blender is switched to a lower speed and the angular velocity of its blade decreases uniformly from 52 rad/s to 12 rad/s. Through what angle does the blade turn during this time
An engineer has designed a machine to produce electricity by using the difference in the temperature of ocean water at different depths. what is the maximum efficiency of this machine
Illustrate when is velocity of the boulder zero? Illustrate what is the magnitude of the acceleration while the boulder is moving? What is the direction of the acceleration while the boulder is moving?
A 5.0- kg block oscillates with an amplitude of 0.090 m on a light spring of constant k = 28.0 N/m. What is the maximum value of the block's velocity
A step-down transformer is used for recharging the batteries of portable devices. find the rms output voltage of the transformer
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