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A baseball is seen to pass upward by a window 23 m above the street with a vertical speed of14 m/s. The ball was thrown from thestreet.a) What was its initial speed?b) What altitude does it reach?c) How long after it was thrown did it pass the window?d) After how many more seconds does it reach the street again?
Three 13cm long rods form an equilateral triangle. Two of the rods are charged to + 19nC, the third to - 19 nC. What is the electric field strength at the center of the triangle
An antique phonograph turntable has a kinetic energy of 2.70×10?2J when turning at an angular velocity of 48.0 rev/min, What is the moment of inertia of the turntable about the rotation axis
A cartoon coyote sets out to capture the elusive road-runner by wearing a pair of ACME jet-powered roller skates, which provide a constant horizontal acceleration of 10 m/s^2. The coyote starts off at rest 100 m from the edge of a cliff at the ins..
Find the average horizontal force exerted by the ground on the feet of a sprinter of mass 44.1 kg who accelerates from rest to a speed of 12.4 m/s in a time interval of 1.00 s
The maximum depth of Lake Superior is approximately 406 m. How much denser is the water at the bottom, compared to the water at the surface of the lake? A. 20% B. 2% C. 0.2% D. 0.02% E. 0.002%
A shop sign weighing 245-N is supported by a uniform 155-N bean. Find out the tension in the guy wire, and the horizontal and vertical forces exerted by the hinge on the bean.
A system consisting of one positively charged particle and onenegatively charged particle is altered by an outside force so thatits potential energy increases by 6.25 mJ. There is no changein kinetic energy between the initial and final states of the..
A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.98kg of water at 26.0 oC to 1.98kg of ice at -5.00 oC in 1 hour. How much wasted heat is rejected to the room in which the freezer sits
a cylinder of diameter d floats with l of its length submerged. The total height is L. What is the frequency of oscillation
Two conductors having net charges of +17.0 µC and -17.0 µC have a potential difference of 17.0 V between them. What is the potential difference between the two conductors
A small statue is recovered in an archaeological dig. Its weight is measured to be 6.8 lb and its volume 0.09 ft3. What is the statue's weight density
Inside an insulated container, a 250-g ice cube at 0 °C is added to 200 g of water at 18 °C. What is the remaining ice mass
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