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1. When a bow and arrow are cocked, a force is applied to the string to pull it back. Is the energy of the system increased? Explain.
As part of a safety investigation, two 1900 cars traveling at 23 are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.5 to stop, and (b) car that hits a concrete barrier and ta..
A system of 1402 particles, each of which is either an electron or a proton, What is the mass of this system
assume the coefficient of kinetic friction between m_{rm A} and the plane in the figure is mu_k = 0.15, and that m_{rm{A}} = m_{rm{B}} = 2.7{rm{ kg}}. What smallest value of mu _{rm{k}} will keep the system from accelerating.
Two atomic clocks are carefully synchronized. One remains in New York, and the other is loaded on an airliner that travels at an average speed of 250m/s, Which clock will show the shorter elapsed time
An ac generator producing 20 V (rms) at 200 rad/s is connected in series with a 50-%uF057 resistor, The rms voltage (in volts) across the capacitor is
A 3.45 kg mass vertically compresses a spring 67.0 cm before it starts to rebound. How high will the Mass move above the uncompressed
A parallel-plate capacitor is constructed from two 13cm X 13cm electrodes spaced 0.90mm apart. The capacitor plates are charged to ± 20nC, How much energy is stored in the capacitor
If a car traveling at 66 km/h will skid 22 m when its brakes lock, how far would it skid if it is traveling at 120 km/h when its brakes lock.
A high-energy pulsed laser emits a 1.2-ns-longpulse of average power 1.7×1011W. Determine the rms value of the electric field
A sphere of styrofoam with a density of 152 kg/m3 has a 45 cm diameter. what is the maximum iron mass that can be suspended by a string from it so that it does not sink
A wrecking ball (weight = 4800 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3600 N. As support cable runs from the top of the boom to the tractor.
A standing wave on a 77.4cm long string has three antinodes. If the string has linear mass density 3.92×10?5kg/m and tension 10.1N , what are the wave's frequency
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