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In US football, after a touchdown the team has the opportunity to earn a point by kicking the ball over a bar between two posts. The bar is 3.05m tall and 10.97m horizontal from the location where the ball is being kicked. If the ball is kicked at 45 degrees above the horizontal, what must its initial speed be if it is to just clear the bar. Express the answer in m/s and km/hr.
Jack was exposed to fast neutrons; he received a radiation dose of 300rem on part of his hand, affecting 28.0grams of tissue. How much radiation did Jack receive
A person desires to reach a point that is 3.40 km from her present location and in a direction that is 350 north of east. However, she must travel along streets that are oriented either north-south or east-west. What is the minimum distance she mi..
A piano tuner sounds two strings simultaneously. One has been previously tuned to vibrate at 292.0 Hz. The tuner hears 2.0 beats per second. By what percentage did the tuner increase the tension on that string
In a serious accident, a nuclear power plant%u2019s reactor vessel cracks, and all of the cooling water drains out. How long will the melting take
a transformer has N^1 =350 turns and N^2 =2000 turns. If the input voltage is 170V, what voltage is developed across the secondary coil?
a cameraman on a pickup truck is traveling westward at 20 kmh while he videotapes a cheetah that is moving westward 30
an 19.0-kg box is released on a 38.0 incline and accelerates down the incline at 0.280ms2 find the friction force
Under an outdoor area "yellow" [Na lamp] light, a fiber is placed between but at the edge of two 3 cm glass slides. How thick is the fiber
a 15 kg block is at rest on a level floor. a 415 g glob of putty is thrown at the block such that it travels
A 130 g ball with speed 7.5 m/s strikes a wall perpendicularly and rebounds in the opposite direction with the same speed. find the magnitudes of the average force on the wall
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
A 11.7 cm radius thin ring carries a uniformly distributed 15.4μc charge. A small 8.6g sphere with a charge of 1.5μc isplaced exactly at the center of the ring and given a very smallpush so it moves along the ring axis (+x axis)
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