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Find the coefficient of kinetic friction between a 4.2 kg block and the horizontal surface on which it rests if an 92 N/m spring must be stretched by 1.8 cm to pull the block with constant speed. Assume that the spring pulls in a direction 11° above the horizontal.
Find the magnitude of , the acceleration of the car after the brakes are applied. Express your answer in terms of some or all of the variables d, t, and v.
Two people push a stalled car at its front doors, each applying a 260 N force at 25 degree to the forward direction. How much work does each person do pushing car 5.5 m.
The springs of a 1300 {rm kg} car compress 6.0 {rm mm} when its 62 {rm kg} driver gets into the driver's seat. If the car goes over a bump, what would be the frequency of vibrations.
A horse races once around a circular track in a time of 18.0 s, with a speed of 18.0 m/s. Illustrate what is the radius of the track? Give your answer in meters, but do not include units.
If the heat engine used to harvest the energy from humans was operating at the theoretical maximum efficiency what temperature would the cold reservoir have to be make this energy source viable? (Assume the hot reservoir is that of the average ski..
A 29.0 kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 85.0 N and is directed at the angle of 30.0° above the horizontal. Find out the coefficient of kinetic friction.
Physics: Speed of car at bottom of driveway; initial speed of bullet, 20 A 2.10 x 10³ kg car starts from rest at the top of a 5.0 m long driveway that is sloped at 20° with the horizontal. If an average friction force of 4.0 x 10³ N impedes the mo..
Two loudspeakers, 5.0 m apart and facing each other, play identical sounds of the same frequency, What is the frequency of the sound (in Hz)
The velocity component of the particle at x = 8.0 m is 2.8 m/s. Illustrate what is the acceleration component during this time interval?
How much kinetic energy is lost in the collision. compute the focal length of the mirror.
What is the friction force that acts on the firefighter. find Max wavelength and Min wavelength.
An engine has an efficiency e1. The engine takes input heat QH from a hot reservoir and delivers work W1. The heat rejected by this engine is used as input heat for a second engine.
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