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A snowboarder descends from rest straight down a slope with a 20 degree pitch that is 800m long. Her snowboard has a coefficient of kinetic friction of 0.29.
A) if you neglect air resistance, find her speed at the bottom of the slope.
B) if air resistance were included, would a heavier or lighter board reach the bottom first?
An underwater scuba diver sees the Sun at an apparent angle of 48.0° above the horizon. What is the real elevation angle of the Sun above the horizon?
A 15.0g rubber bullet hits a wall with a speed of 180m/s. What is the direction of the change in momentum of the bullet
A circular metal plate has a radius of (60 + x ) cm, a thickness of 15 cm and a mass of 900 kg. What is the density of the metal
A charge Q is uniformly distributed throughout a nonconducting sphere of Radius R. What is the magnitude of the electric field at a distance of R/2 from the center of the sphere? What is the magnitude of the electric field at a distance of 2R from th..
A skier finds that she must give hersel a push to get started down ski slopes with angles less than 8 degrees. What is the coefficient of static friction between the skis and the snow
The classroom has a volume of about 100 m3. The pressure is atmospheric and the temperature is 75 ºF. What is the rms speed of the oxygen molecules
A 6.0- kg concrete block rests on a level table. A 3.9- kg mass is attached to the block by a string passing over a light, frictionless pulley. find the coefficient of friction between the block and the table
A light spring with a spring constant of 80.0 N/m rests vertically on a table. A 2g balloon is filled with helium (0°C and 1 atm pressure) to a volume of 5.00 m3 and connected to spring, causing the spring to stretch and expand. How much does the ..
An electron and a positron have masses of 9.11 10-31 kg. They collide and both vanish, determine the energy of the electromagnetic radiation
A flywheel 0.400 m in diameter pivots on a horizontal axis. A rope is wrapped around the outside of the flywheel, and a steady pull of 80.0 N is exerted on the rope. What is the angular acceleration of the flywheel
Consider a systen of N non-interacting particles for which the energy of each particle can assume two and only two distinct values: 0 and E (E>0). Find the entropy of the system
In a certain region, the earth's magnetic field has a magnitude of 5.4 × 10-5 T and is directed north at an angle of 49° below the horizontal. Determine the bullet's electric charge
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