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A 250 kg flatcar 25 m long is moving with a speed of 3.0 m/s along horizontal frictionless rails. A 61 kg worker starts walking from one end of the car to the other in the direction of motion, with speed 2.0 m/s with respect to the car. In the time it takes for him to reach the other end, how far has the flatcar moved?
A relaxed crystalline lens has a refractive index n=1.42 and radii of curvature R1=+10.0mm, Calculate the focal length and optical power of the lens
A rocket is fired at a speed of 82.0 m/s from ground level, at an angle of 31.0 ° above the horizontal. find By how much does the rocket clear the top of the wall
An electric field of 254,000 N/C points due west at the certain spot. What are the magnitude and direction of the force that acts on the charge of -8.1 µC at this spot.
A 71kg pole-vaulter falls from rest from a height of 4.6m onto a foam-rubber pad. The pole-vaulter comes to rest 0.4s after landing on the pad.
Eight books, each 3.90 cm thick with mass 1.70 kg, lie flat on a table. How much work is required to stack them on top of each other.
A shopper walks from the door of the mall to her car 250m down the line of cars, and then turns 90 degrees to the right and walks an additional 60 meters. What is the magnitude of the displacement of her car from mall door.
A sailboat on the ocean has a mast of height 18.5 m. When viewed through a pair of binoculars the mast has an angular size of 0.065 rad. what is the distance between the observer and the sailboat
A stone is being accelerated vertically upward by a string attached to it. What is the acceleration of the stone at the top of its path
A 188.0 g piece of lead is heated to 81.0oC and then dropped into a calorimeter containing 692.0 g of water that initally is at 21.0oC.
What is the total charge of all the electrons in a 16 kg bar of iron, What is the net charge of the bar if it managed to get rid of 2% of the electrons
A spring with spring constant of 29 N/m is stretched 0.21 m from its equilibrium position. How much work must be done to stretch it
Find out the magnitude of the charge on the moving particle. The baby soon learns to bounce with utmost amplitude and minimum effort by bending her knees at what frequency.
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