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An attack helicopter is equipped with a 20mm cannon tat fires 112 g shells in the foward derection with a muzzle speed of 743 m/s. The fully loaded helicopter has a mass of 1630 kg. A burst of 238 shells is fired in a 3.99 s interval. What is the resulting average force on the helicopter?
A train 400m long is moving on a straight track with a speed of 84.30km/h. The engineer applies the brakes at the crossing and later the last car passes crossing with the speed of 17.7 km/h. suppose constant acceleration; conclude how long the tra..
Unpolarized light is incident on a system of three polarizers. The second polarizer is oriented at an angle of 30 degrees with repect to the first, what is the intensity of the incident light
Two loudspeakers are placed 3-m apart. They emit 498 Hz sounds, in phase. A microphone is placed 3.2m distant from a point midway between the two speakers, where an intensity highest is recorded.
A parallel-plate air capacitor has a capacitance of 300 {\rm pF} and a charge of magnitude 0.250 \mu {\rm C} on each plate. The plates are 0.500 {\rm mm} apart. What is the surface charge density on each plate
a 28 kg rifle bullet at an unknown velocity buries itself in a 3.6-kg pendulum hanging on a 2.8-m long string, what was the speed of the bullet prior to impact
A circular coil having an area of 24 cm^2 is plaved in a uniform magnetic field of 0.60T, which is derected vertically upward. Find the magnitude of the magnetic flux contained in the coil
A Carnot engine whose high-temperature reservoir is at 680K takes in 570J of heat at this temperature in each cycle and gives up 350J to the low-temperature reservoir. What is the temperature of the low-temperature reservoir
A block (mass = 2.0 kg) is hanging from a massless cord that is wrapped around a pulley (moment of inertia = 1.1 10-3 kg · m2), Find the angular acceleration of the pulley
A horizontal circular platform rotates counterclockwise about its axis at the rate of 0.947 rad/s. Calculate the total angular momentum of the system
A nozzle is now attached to the end of the hose. If the nozzle diameter is one-third the diameter of the hose, what is the speed of the water leaving the nozzle
If the create has a mass of 110 and is 1.60 tall and 0.80 in depth and width, what is the minimum force needed to make the crate start tipping? (Assume the center of mass of the crate is at its center and static friction great enough to prevent sl..
A u-tube with constant cross section is partly filled with water. Engine oil of density 0.8g/cm3 is poured into the right arm (without mixing) until the water level rises 2.0cm. The length of the oil column is then.
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