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During a violent thunderstorm, hail the size of marbles (diameter = 2.10 cm) falls at a speed of 37.0 m/s. There are estimated to be 175.0 hailstones per cubic meter of air. Assume that, as for ice, 1.00 cm³ of hail has a mass of 0.920 g.
A) What is the mass of each hailstone?
B) What is the magnitude of the force exerted by the hail on a 10.00 x 21.00 m flat roof during the storm? Ignore the bounce of the hail on impact.
Light travels from air through a flat sheet of glass (n =1.5) into water. If the angle of incidence in air is 39°, what is the angle of the refracted ray in water
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small 12.8g plastic ball is tied to a very light 26.9cm string that is attached to the vertical wall of a room. Find the direction of the electric field in the room
A 5.8 m diameter merry-go-round is rotating freely with an angular velocity of 0.90 rad/s. What is the angular velocity of the merry-go-round now
q1. a book with a mass of 2.0 kg is held in equilibrium on a board with a slope of 60.0 degrees by a static frictional
A boy is standing on a frozen lake (i.e. no friction) holding a rope that is attached to his sled. He pulls on the rope and exerts a horizontal force of 5.2 N, What is the acceleration of the boy
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You throw a bouncy ball directly down toward the ground. When it leaves your hand, 1 m above the ground, it is moving at 5 m/s. What is the ball's maximum height after it bounces
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An ideal gas consists of n moles of diatomic molecules that rotate but do not oscillate. What is the change in the mean free path of the molecules
Block B in the figure weighs 760 N. The coefficient of static friction between block and table is 0.28; angle ? is 27°; Find the maximum weight of block A for which the system will be stationary
What is the smallest number of whole logs (? = 725 kg/m3, radius = 0.0917 m, length = 3.10 m) that can be used to build a raft that will carry four people
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