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A car of mass 1200 kg slides along an icy road at 17.5 m/s [E] when it hits a rough patch of road that is 7.5 m long. Assume the coefficient of kinetic friction between the car and the rough patch is 0.47.
A pulley system is used to raise a shipping container from the dock to a cargo ship. An effort force of magnitude 5.4 x 104 N is required to lift a load of mass 2.3 x 104 kg. The effort force moves 54 m while the load is raised 8.7 m.
N to raise one end of the piano, but the maximum force the homeowner can apply is 4.5 x 102 N. The accomplish
the task, she places a fulcrum 0.3 m from the piano and uses a strong board as a first-class lever to raise the
piano.
1. A block is sliding at a constant speed down a wooden board inclined at an angle 23º with the horizontal surfaces. The mass of the block is 6.5 kg. Find the (a) coefficient of kinetic friction and (b) kinetic friction. (c) Explain what would happen if the board is lubricated so that friction is reduced to 75%.
- A ray of light from the sun strikes the windshield of a car at an angle of incidence of 36.0° and refracts at an angle of 24.0°. If the initial light had a wavelength of 630 nm, determine the wavelength of the light after it has refracted.
(a) Draw the free body diagrams of each of the objects.
(b) Determine the acceleration of each object and their directions.
(c) Determine the tensions in the two strings.
a) Which frame has the proper time?
b) How far can the kaons travel in the laboratory frame during their lifetime?
