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A 60 kg girl and her 45 kg brother are at rest at the centre of a frozen pond. He pushes her so that she slides away at 2.4 m/s. How much total work is done?
a) 58 J
b) 170 J
c) 350 J
d) 400 J
A student ties a 500 gram rock to a 1.0 meter long string and swings it around her head in a horizontal circle. Find at what angular velocity does the string tilt down at a 10o angle
A +13 nC charge is located at (x,y)=(0cm,12cm) and a -4.0 nC charge is located at (x,y)=(6.0cm,0cm). Where would a -15nC charge need to be located in order that the electric field at the origin be zero?
You fly your 15 m spaceship, parallel to the ship's length with a speed of c/3 to your friend. How long is your spaceship as observed by your friend
Two tug boats are towing a ship. Each exerts a horizontal force of 5 tons and the angle between their towropes is 90 degrees. What net force is exerted on the ship?
A man with a mass of 59 kg stands up in a 73-kg canoe of length 4.0 m floating on water. How far does the canoe move
A tennis ball of mass 57 g travels with velocity m/s toward a wall. After bouncing off the wall, What is the change in the momentum of the tennis ball
Making use of your answer to part b , calculate the amount of energy generated ( released ) from 2.5 g of stearin.
A current of 0.105 mA flows in a silver wire whose cross-sectional area is 0.930 mm2. Find the density of electrons in the wire, assuming that there is one conduction electron per silver atom
It collides with a 10,000 kg railway car resting at the bottom of the track with its brakes off. The two cars couple together and roll up the track to a height of h. find out h.
An average friction force of 4000 N impedes the car’s motion so that its speed at the bottom of the driveway is 3.8 m/s. Illustrate what is the length of the driveway?
A 70.0-kg ice hockey goalie, originally at rest, catches a 0.150-kg hockey puck slapped at him at a velocity of 35.0 m/s. what would their final velocities be in this case
What is the distance between the first-order red and blue fringes? Express your answer to two significant figures and include the appropriate units.
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