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A bicycle wheel, of radius 0.31 m and mass 3.0 kg (concentrated on the rim) is rotating at 4.20 rev/s. After 42 s the wheel comes to a stop as of friction. What is the magnitude of the average torque due to frictional forces?
A heat pump is essentially an air conditioner installed backward. It extracts energy from colder air outside and deposits it in a warmer room. Suppose that the ratio of the actual energy entering the room to the work done by the device's motor is ..
A simple pendulum uses a steel wire as the "string." The length of this wire is 1.5 m at room temperature. What is the change in the period of the pendulum
A small ball rolls horizontally off the edge of a tabletop that is 1.06 m high. how long was the ball in the air
Calculate the specific gravity of a liquid given the following information: m = 51.50 ± 0.05 grams, mA = 32.00 ± 0.05 grams,mL = 42.50 ± 0.05 grams
a mercury thermometer is constructed as shown. the capillary tube has a diameter of 0.0025 cm and the bulb has a
Astronauts walking on the Moon are seen "bounding" rather than walking normally. Why?
A particle is acted on by two torques about the origin: τ1 has magnitude 10 N m and pointsin the direction of increasing x, and τ2 has a magnitude of 12N m and points in the direction of decreasing y.
A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. What is the mass of the meter stick
A 2-kg block is released from rest at the top of an inclined planeof angle θ = 30°. The block is located distance l =20 cm away from a spring that has spring constant k =300 N/m, as shown. The coefficient of friction between the block and plane is..
The armature windings of a dc motor have a resistance of7.5? . The motor is connected to a 120-V line, What will be the current in the motor
Consider the system shown in the figure. The mass of the bucket and liquid is 1.10 kg, and the mass of the ball is 0.150 kg. Find the reading on the scale after the string breaks
at what temperature will aluminum have a resistivity that is three times the resistivity of iron at room temperature?
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