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Hail comes straight down at a mass rate of m/%u0394t = 0.030 kg/s and an initial velocity of v0 = -10 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 +10 m/s. Ignoring the weight of the hailstones, calculate the force exerted by the hail on the roof.
A projectile is fired at 60.0 o above the horizontal. Its initial speed is equal to 150.0 m/s. Like most problems in this class (2010), ignore the effects of air unless told otherwise
A grocery cart is pushed along an aisle by a shopper who exerts a constant horizontal force of . The acceleration of gravity is . If all frictional forces are neglected and the cart starts from rest, illustrate what is the grocery cart’s final s..
A string that is fixed at both ends has a length of 1.81 m. When the string vibrates at a frequency of 84.3 Hz, a standing wave with five loops is formed. What is the fundamental frequency of the string
A 130- baseball, moving along the axis with speed 35 , strikes a fence at a 45 angle and rebounds along axis with unchanged speed Give the - and - components of its change in momentum.
A football player with a mass of 89 kg and a speed of 2.1 m/s collides head-on with a player from the opposing team whose mass is 120 kg. Find the speed of the second player
A female orb spider has a mass of 0.45g . She is suspended from a tree branch by a 1.0m length of 0.0020-mm-diameter silk. If you tap the branch and send a vibration down the thread, how long does it take to reach the spider
A metal bar is used to conduct heat. When the temperature at one end is 100 C and at the other is 20 C, what will be the rate of heat transfer
A ball is shot from the ground into the air. At a height of 10.60 m, the velocity is observed to be v = (8.60 m/s) i + (6.50 m/s) j
Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 5.0 s, it rotates 45 rad. What was the angular acceleration during this time
If 45 g is suspended at 25 degree, 105 g is suspended at 85 degree, and 65 g is suspended at 330 degree, what mass must be suspended at what angle to balance these three forces?
A 120 W lightbulb and a 90.0 W lightbulb are connected in a series. what is the current through the two bulbs
In order to fabricate a uniform wire of resistance 1.2 ?, out of m=1 g copper which has a density of 8.92×103 kg/m3, What should be the diameter of the wire
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