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Hail comes straight down at a mass rate of m/?t = 0.070 kg/s and an initial velocity of v0 = -14 m/s and strikes the roof perpendicularly. Unlike rain, hail usually does not come to rest after striking a surface. Instead, the hailstones bounce off the roof of the car. Suppose that the hail bounces off the roof of the car with a velocity of +14 m/s. Ignoring the weight of the hailstones, calculate the force exerted by the hail on the roof.
Motor M draws in the cable with an acceleration of 4 ft/s^2, measured relative to the 200 lb mine car. Determine the acceleration of the car and the tension in the cable. avoid the mass of the pulleys.
A 0.32 kg body undergoes simple harmonic motion of amplitude 9.1 cm and period 0.40 s. What is the magnitude of the maximum force acting on it
A 1.00-kg glider attached to a spring with a force constant of 25.0 N/m oscillates on a horizontal, frictionless air track. At t = 0 the glider is released from rest at x = -3.00 cm.
You are arguing over a cell phone while trailing an unmarked police car by 25.0 m; both your car and the police car are traveling at 120 km/h. What is the separation between the two cars when your attention finally returns
A stream of water strikes a stationary turbine blade horizontally. The incident stream has a velocity of +16m/s whilst the exit has a velocity of -16m/s. mass of water per second that strikes the blade is 30kg/s.find the magnitude of average force ex..
Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed, Determine the magnitude of the electron's centripetal acceleration
A child loses his balloon, which rises slowly into the sky. If the balloon is 23 cm in diameter as the child loses it, what is its diameter at the following altitudes? Assume that the balloon is very flexible and so surface tension could be neglec..
Airplane A , starting from rest with constant acceleration, requires a runway 600{\rm m} long to become airborne.
A red ball is thrown down with an initial speed of 1 m/s from a height of 27 meters above the ground. How long does it take the red ball to reach the ground
If it takes you about 2 minutes to fill your 12 gal (or 0.48 m3) gas tank. Estimate the velocity of the gas as it leaves the nozzle
A positive charge of Q = 4.60 uC is fixed in place. From a distance of ri = 4.60 cm a particle of mass m = 5.70 g, What is the minumum distance rf between the two charges
A block of mass 2.0 kg is pushed against a vertical wall by a horizontal push (P) of 50.0 N. Find the force AND the direction of the friction
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