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To start a mower, a person must pull on a string attached to a pulley with a force of 70N. The pulley is a disc of mass 0.1kg and radius 0.1m. Consider the pull to act tangent to the pulley at the edge of the pulley. Calculate the angular acceleration of the pulley and the rotation rate if the torque remains constant for 2s.
The position of a rocket sled on a straight track is given as x = a t3 + b t2 + c, What is the sled's average speed between t = 3.48 s and t = 6.92 s
Three parallel wires 8.0 m long carry each 20 A of current in the same direction. Find the magnitude of the force on each wire
Calculate the value of the error (only) with two decimal places for: (5.3 +/- 0.1) / (2.9 +/- 0.1) and (7.3 +/- 0.4) / (3 +/- 0.2)
A 1200kg car rounds a curve of radius 65 m banked at an angle of 14degrees. if the car is traveling at 30km/hr, will a friction force be required? if so, how much and in what direction.
The sound level measured in a room by a person watching a movie on a home theater system varies from 65 dB during a quiet part to 95 dB during a loud part
The pressure of air in your house can stay constant during the day if the temperature rises. Determine the number of moles of air that leave the house during the day time
A 8.9 dog takes a nap in a canoe and wakes up to find the canoe has drifted out onto the lake but now is stationary. He walks along the length of the canoe at 0.54, relative to the water, and the canoe simultaneously moves in the opposite direction a..
a block of mass m = 2.50 kg is pushed a distance of d = 2.20 m along a frictionless horizontal table by a constant applied force of magnitude F = 16.0 N directed at an angle of 25.0 degrees below the horizontal
A refrigerator has a 1000 W compressor, but the compressor runs only 20% of the time, If electricity costs $0.10/kWh, what is the monthly (30 day) cost of running the refrigerator
Light is an electromagnetic wave and travels at a speed of 3.00 x 10^8 m/s. The human eye is most sensitive to yellow-green light, that has a wavelength of 5.45 x 10^-7m. How you find the frequency of this light.
The edge of the thimble of a micrometer moves a distance of 2.0 mm when it is given four complete revolutions. Find the pitch of the micrometer
An iron bar 50 cm long is raised to a copper bar 60 cm long and of the same diameter. What is the heat flow down the rod if its cross-sectional area is 2.50 cm2
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