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You sled down a hill of 45-m vertical height. The combined mass of you and your sled is 130kg. You start from rest at the top of the hill and have a speed of 8 m/s at the bottom. How much work was doen against friction during your decent?
Two cars are initially at rest at the starting line of a 100-m long track. the first car accelerates at a rate of 2.50 m/s^2. how far behind is the first car
A telescope can be used to enlarge the diameter of a laser beam and limit diffraction spreading. what is the minimum angular spread of the beam
A small steel ball bearing with a mass of 17g is on a short compressed spring. When aimed vertically and suddenly free, spring sends the bearing to a height of 1.33 m. compute the horizontal distance ball would travel if the same spring were aimed..
If a person exerts 44 N of force on the back of a seat while stopping in 0.4 seconds, what is the impulse on the seat back
A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. What percentage of the rock is gold by volume
An 82 g arrow is fired from a bow whose string exerts an average force of 95N on the arrow over a distance of 77.00 cm. What is the speed of the arrow as it leaves bow.
An 81.7-g arrow is fired from a bow whose string exerts an average force of 121 N on the arrow over a distance of 78.4 cm
A catcher catches a fastball going 95mi/hr and recoils 12cm while stopping the ball in 0.005s. FIND the average force the ball exerts on the hand & glove
A point charge of magnitude 9.15uC is at the center of a cube with sides of length 0.470m. find the electric flux through each of the six faces of the cube
A man strides across a bed of embers. Assume the glowing charcoal is covered with a thin layer of ash 0.50 mm thick and is at a temperature of 650C. The thermal conductiviity of ash and charcoal is 1.5 W/ (mxK). (a) Estimate the heat transferred t..
A speedboat moving at 33.0 m/s approaches a no-wake buoy marker 100 m ahead. How long does it take the boat to reach the buoy
There are two identical, positively charged conducting spheres fixed in space, find the initial charge on each sphere, q1 and q2 if initially q1
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