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1. Draw a free body diagram for the following situations:
a) A car is moving at constant speed on highway;
b) A car is accelerating to enter a highway;
2. A dockworker loading crates on a ship finds that a 20-kg crate, initially at rest on a horizontal surface, requires a 75-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60 N is required to keep it moving with a constant speed.
Find the coefficient of static and kinetic friction between crate and floor.
3. A 300-kg crate is placed on an adjustable inclined plane. As one end of the incline is raised, the crane begins to move downward. If the crate slides down the plane at constant speed when the incline angle is 25°, what is the coefficient of kinetic friction between ramp and crate?
An x-ray photon of 0.13 nm strikes a metal and undergoes Compton scattering of the electrons in the metal. What is the momentum of the incident photon
A pail of water is rotated in a vertical circle of radius 1.0 meter. Find what two external forces act on the water in the pail
two balls 14 cm in diameter are placed 200 m apart on a frictionless horizontal plane at 50ordm n on the rotating
A hammer strikes one end of a thick iron rail of length 9.43 meter. Obtain the separation in time between arrivals of two pulses
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A 20.0 kilogram parcel slides down a 34.0 degree incline and accelerates at 0.273 m/s2. Calculate the friction force impeding its motion
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The filament of a 127 W (116 V) lightbulb is a tungsten wire 0.05 mm in diameter. How long is the filament
question1a dolphin located in sea water at a temperature of 26c emits a sound directed toward the bottom of the ocean
A low-voltage device like an electric bell obtains its electricity from a 120 V source, but requires only 4–8 V. Thus,it requires a small transformer. This often takes the form of an autotransformer, which has only one winding around a single core..
A spherical mirror is polished on both sides. When used as a convex mirror, the magnification is +1/5. What is the magnification when used as a concave mirror, the object remaining the same distance from the mirror? Give your answer to three signific..
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