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A military gun is mounted on a railroad car (m = 1400 kg) as shown in the figure below There is no frictional force on the car, the track is horizontal, and the car is initially at rest. The gun then fires a shell of mass 31 kg with a velocity of 285 m/s at an angle of 35° with respect to the horizontal. Find the recoil velocity of the car.
A helium ion (Q = +2e) whose mass is 6.6×10?27kg is accelerated by a voltage of 3700V, What is its speed? Express your answer to two significant figures and include the appropriate units
Hagrid thinks he is more powerful than Snape.He performs 1800 J of work in a total of 10 seconds, How much power does each man exert
A disc undergoes 30 revolutions as it accelerates uniformly from rest to 5 rev/sec. What's the angular acceleration of the disk
What happens when a proton moves parallel to a magnetic field and when a proton moves perpendicular to a magnetic field
A rod is 2.40 m long and has a diameter of 2.50 mm. What is the Young's modulus for this rod
the speed of sound in helium is 965 m/s. if the density of helium is 0.179 kg/m^3, then what is the bulk modulus of helium
A current of 13.2 A is carried by a copper wire of diameter 1.29 mm. how long does it take for a conduction electron to move 0.55 m along the wire
A spaceship is 1600 m long when it is at rest. When it is traveling at a certain constant speed its length is measured by external observers and it is found to be 1370 m. find the speed of the spaceship in terms of the speed of light
Does an apple tree exert a gravitational force on the earth and if so, how large of a force? Consider and explain this question when the apple is attached to the tree, and when it is falling.
A stone is thrown upward with an inital speed of 20 m/s. What is its acceleration at the higest point of its trajectory, Find its veolocit
a ball hung from a vertical spring oscillates in simple harmonic motion with an angular frequency of 2.6 rad/s, What is the maximum acceleration of the ball
A large turntable rotates about a fixed vertical axis, making one revolution in 5.00 s. What is the angular speed of the turntable when the child is 2.50 from the center, assuming that you can treat the child as a particle
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