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A sledge loaded with bricks has a total mass of 18.9 kg and is pulled at constant speed by a rope inclined at 20.1° above the horizontal. The sledge moves a distance of 19.4 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500. (a) What is the tension in the rope? (b) How much work is done by the rope on the sledge? (c) What is the mechanical energy lost due to friction? I'm having trouble with part C. I used the fs=.5*sin20.1*19.4 for the friction force, but that's not correct...
002 10.0 points A plane designed for vertical takeoff has a mass of 7.1 × 103 kg. Find the net work done on the plane
An astronaut is being tested in a centrifuge. The centrifuge has a radius of 8.76 m and, in starting, rotates according to Theta = 0.30 t 2. what is the magnitude of the astronaut's linear speed
AN object of a mass of 8 kg revolves in a circle of a radius of 3 mattached by a massless string to the center. There is nogravity or friction. how long does it take the system to stop
A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 12 A, find the power consumed by the vacuum cleaner
An electron is moving through a magnetic field whose magnitude is 83 x 10-5 T. The electron experiences only a magnetic force and has an acceleration of magnitude 34 x 10+13 m/s2. At a certain instant, it has a speed of 72 x 10+5 m/s. Determine the a..
A 0.245 kg ball is thrown straight up from 2.20 m above the ground. Calculate the total work done by the force of gravity during that time
A square loop 10 cm on a side consists of 100 turns of wire that experiences a minimum torque of zero and a maximum torque of 0.045 N · m, calculate the magnetic field strength that the loop rests in
A human eyeball is about 2.0 cm long, and the pupil has amaximum diameter of about 8.0 mm. What is the "speed" of this lens
Assuming that a light bulb acts as a point source emitting the light isotropically at 100W. What is the root-mean-square value of the electric field at distance d=20m from the bulb
A long solenoid of length 7.0 x 10^-2 meters and cross-sectional area of 4.0 x 10^-5 meters^2 contains 6200 turns per meter. Find the energy stored in the solenoid after 3 seconds
A very long solenoid of circular cross section with radius R = 4.0 cm, is centered on, and has its length parallel to, the z axis. What direction is the force on the proton
An auto goes from 0 to 30 m/s in 5 s, at a uniform rate of acceleration. The radius of the auto's tires is .33 m. How many revolutions per second are the tires making
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