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A mass, at rest on a frictional metal flat circular plate, radius 2m, slides when the angle to the horizontal is raised just above 300. If the plate is lowered so it is now in a horizontal plane, and spun around its center. At what minimum period should it be rotating so when the mass is 1 m from the center friction will not hold it in place?
A horizontal pipe contains water at a pressure of 140kPa flowing with a speed of 1.2m/s . The pipe narrows to one-half its original diameter. What is the speed of the water
A car accelerates from rest to a speed of 19.0m/s in 6.00 seconds. If the car weighs 16000N, what average power must the motor produce to cause this acceleration
A sphere that is a perfect blackbody radiator has a radius of 0.120 m and is at 200°C in a room where the temperature is 20°C. Calculate the net rate at which the sphere radiates energy
an air capacitor is made from two flat parallel plates 1.50 mm apart. the magnitude of charge on each plate is 0.0180
A uniform electrical field is established by connecting the plates of a parallel-plate capacitor to a 11V battery. The plates of the capacitor are separated a distance 3.50 cm. What is the capacitance of this parallel plate capacitor
A skydiver of mass 80.5 kg jumps from a slow-moving aircraft and reaches a terminal speed of 50.7 m/s. What is the drag force on the skydiver when her speed is 50.7 m/s
A laser with a power output of 2.10 mW at a wavelength of 425 nm is projected onto calcium metal. Given the binding energy is 2.28 eV, how many electrons per second are ejected
An engine has an efficiency e1. The engine takes input heat QH from a hot reservoir and delivers work W1. The heat rejected by this engine is used as input heat for a second engine.
A 137-cm-long wire is made by welding a 1.3-mm-diameter, 26-cm-long copper wire to a 0.31-mm-diameter, What is the resistance of the composite wire
The circuit is 10v clockwise into 40 ohm resistor downward through 12 ohm resistor back to the negative terminal of the battery. What is the power deliverd by both batteries
A 52% efficient device uses chemical energy to generate 570J J of electric energy. How much chemical energy is used
A neutron star has a mass of 2.20 × 10^30 kg (about the mass of our sun) and a radius of 5.20 × 10^3 m. Assume an object falls from rest near the surface of such a star. How fast would it be moving after it had fallen a distance of 0.0083 m.
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