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A motor having an efficiency of 88% operates a crane having an efficiency of 42%. With what constant speed does the crane lift a 410-kg crate of machine parts if the power supplied to the motor is 5.5 kW?
A beam of light of wavelength 482 nm passes through two closely spaced glass plates, as shown in the figure below. For what minimum nonzero value of the plate separation d will the transmitted light be bright? This arrangement is often used to measur..
Two positive point charges, each 17? C, lie along the x-axis at x = –0.12m and x = +0.12m.
If a washing machine drum has a radius of 27 cm and spins at a rate of 3.9 revs per second, what is the strength of the artificial gravity that the clothes are subjected to? Express answer as amultiple of G. Please work out this question using "ma..
A bale of hay sits on the bed of a trailer. The trailer is starting to accelerate forward, and the bale is slipping toward the back of trailer. What would a force diagram and a free-body diagram look like for the above situation.
A hot (70°C) lump of metal has a mass of 250g and a specific heat of 0.25 cal/g°C. John drops the metal into a 500 g calorimeter containing 75g of water at 20°C.
A baseball (m = 137 g) approaches a bat horizontally at the speed of 40.6m/s (91 mi/h) and is hit straight back at a speed of 45.1m/s (101 mi/h). If the ball is in contact with the bat for a time of 1.00 ms, what is the average force exerted on the..
(8c1p14) Time standards are now based on atomic clocks. A promising second standard is based on pulsars, which are rotating neutron stars, What is the mass of gasoline (? = 0.680 g/cm3) in a 94.6 L gasoline tank? (kg)
A power supply maintains a potential difference of 81.5 V across a 1.01-k? resistor. What is the current in the resistor in milliamperes?
You are pushing a 142 kg wooden crate in a straight line a distance of 5.1 m across a wooden floor. The crate is speeding up at 0.30 m/s^2. What is the work done by friction on the crate
Coherent ligh of a wavelength 500nm passes through a narrow slit. In the single-slit diffraction pattern observed on a screen that is 4.0m from the slit, what will the width of the central maximum be
A light stick with two masses attached to it is spinning about its center at 5 revolutions per minute. The length of the stick is 2.5 meters and the masses are 1.5 kg each.
The rms current in a 46-%u03A9 resistor is 0.34 A. What is the peak value of the voltage across this resistor
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