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In figure (a), a 4.2 kg dog stands on a 15 kg flatboat at distance D = 6.1 m from the shore. It walks 2.1 m along the boat toward shore and then stops. Assuming no friction between the boat and the water, find how far the dog is then from the shore.
A 0.250 kg ball attached to a string s being swung in a vertical circle, like a roller coaster doing a loop-de-loop, with a radius of 1.15 m. What is the minimum speed at the top of the circle to keep the string from going slack
A father racing his son has two-fifths the kinetic energy of the son, who has three-fifths the mass of the father. The father speeds up by 1.0 m/s, What is the original speed of the son
The strongest person in the world lifted th read end of his car a mass of 615 kg a verticle distance of .24 meters. How much work did he do to life the car
The objective lens of the refracting telescope at the Lick Observatory in California has a focal length of 57 ft. What is the refractive power of this lens? What focal length (mm) eyepiece would give a magnification of 1000x for this telescope?
A body is moving with velocity of 8m/s. After 5 Seconds the velocity of the body becomes 18m/s. Find the acceleration of the body
An 8-kg ball hanging from the ceiling by a light wire 135cm long is struck in an elastic collision by a 2 kg ball moving horizontally at 5.00 m/s just before the collision. Find the tension in the wire just after collision.
A fisherman accidentally steps off the ledge of a 4.0 meter-high dock and falls into the lake below the dock. what is the fisherman's speed on entering the water
A car travels due east with a speed of 44.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. Find the velocity of the rain
The two liquids do not mix. What is the difference in height between the top surface of glycerine and top surface of the alcohol.
A buzzer generates a sound by vibrating with a frequency of 440 Hz in air. If this buzzer is placed under water, What frequency would a fish hear
Two identical diverging lenses are separated by 15 cm. The focal length of each lens is -8.0 cm. Determine the final image distance relative to the lens on the right
Suppose the ball is thrown from the same height as in the above problem at an angle of 36.0°below the horizontal. find the speed and angle of the velocity vector with respect to the horizontal at impact
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