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A dog with a mass of 20 kg is sitting on a board with a mass of 5 kg. The board is on ice and is free to slide without friction. The dog jumps off the board in a north direction at 4 m/s. What is the resultant velocity of the board?
A 79kg person holds out his arms so that his hands are 1.6m apart. Normally, a person's hand makes up about 1% of his or her body weight. For round numbers, we shall assume that all the weight of each hand is due to the calcium in the bones.
Two protons are released from rest when they are 7.00mm apart. Calculate maximum acceleration
A 140-m-wide river flows due east at a uniform speed of 3.9 m/s. A boat with a speed of 7.8 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. How long does it take for the boat to cross the river
A dc motor with its rotor and filed coils connected in series has an internal resistance of 3.2 ?. What is the power delivered to the motor
A 1500 kg car is driven onto a pair of ramps so that it fronts wheels have been raised 0.3 m above the rear wheels. How much of the car's weight is supported by the rear wheels
A 62-kg skier speeds down a trail. The surface is smooth and inclined at an angle of 22 with the horizontal. Determine the normal force acting on the skier
Find the energy released in the fusion reaction 2/1H+ 3/1H? 4/2He+n. The mass of 2/1H is 2.014102 u
A 0.17- kg block on a wooden table is given a sharp blow with a hammer. The block then slides across the table to a stop. How far does the block go
At a county fair, a boy and two friends bring their teddy bears on the giant Ferris wheel. The boys are seated in positions 45° from each other. How far apart will the three teddy bears land
Find the angular momentum of the second hand on a clock. The second hand has a length of 20.0cm and a mass of 8.0g
A 1200g model rocket is resting horizontally at the top edge of a 40-m-high wall when it is accidentally bumped, How far from the base of the wall does the rocket land
A 22-L sample of air at 298K contains 0.10 grams of water vapor. What is the relative humidity of the air
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