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A kingfisher is hovering 30m above a lake when it drops a fish its carrying. A second kingfisher, 5.0m above the first dives toward the falling fish with an initial downward velocity. The second kingfisher falls freely. What initial speed should it have if it is to reach the fish just before the fish hits the water?
A compound lens system consists of two converging lenses, one at x = -20.0 cm with focal length f_1= 10.0 cm, and the other at x= 20.0cm with focal length f_2 = 8.0 cm. What is the focal length of the new lens at the origin
How much time has elapsed between the two measurements.
Suppose you throw a 0.054-kg ball with a speed of 11.6 m/s and at an angle of 28.5° above the horizontal from a building 12.7 m high. What will be its kinetic energy when it hits the ground
Saturn has an equatorial radius of 6.00 107 m and a mass of 5.67 1026 kg. Compute the acceleration of gravity at the equator of Saturn
A loop of diameter d = 10 cm, carrying a current I = 0.2 A is placed inside a magnetic field = 0.3 T. Calculate the magnitude of the torque on the loop
A block is at rest on a plank whose angle can be varied. The angle is gradually increased from 0 deg. At 27.1°, Calculate the kinetic coefficent of friction between the block and the plank
An object is located 13.0 cm in front of a convex mirror, the image being 7.00 cm behind the mirror. How far in front of the mirror is the second object located
A uniform plank of length 5.0 m and weight 225 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 415-N walk on the overhanging part of the plank before it just ..
As you eat your way through a bag of chocolate chip cookies, you observe that each cookie is a circular disk with a diameter of 8.50 ± 0.02 \rm cm, Find the ratio of the diameter to the thickness
What is the coefficient of kinetic friction
A fire helicopter carries a 649 kg bucket of water at the end of a 18.7 m long cable. Flying back from a fire at a constant speed of 44.2 m/s, Determine the force of air resistance on the bucket
Find the change in internal energy using first law of thermodynamics.
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