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Harold the Hurler is a physics student who is renowned for his baseball pitching arm. In order to determine the amount of work he performs in throwing a baseball, Harold devises an experiment. He stands at the bottom of a deep pit and hurls a 148-g baseball through an open third-floor window in a nearby building. Harold\'s aim is so accurate that the ball then smoothly enters the tube of the Baseball Absorber that Harold invented and patented. In this device the ball compresses a spring until it comes momentarily to rest, and this maximum amount of compression is recorded as 47.5 cm. The spring\'s force constant is 815 N/m, and the position of the baseball\'s momentary rest is 7.05 m above ground level. The point in the pit where the Hurler starts his pitch is 13.5 m below ground level. How much work does Harold perform on the baseball? Take g = 9.80 m/s2.
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.
While Voyager 2 sent back pictures of Neptune during its historic flyby of that planet in 1989, the spacecraft's radio signals travelled for 4 hours at the speed of light to reach Earth. How far away was the spacecraft.
Two 3.5 kg bodies, A and B, collide. The velocities before the collision are A = (21 + 30) m/s and B = (-34 + 11) m/s. After the collision, ′A = (-4.5 + 16) m/s.
If a ball is thrown upwards at 20 ft/sec, the height h after t seconds is given by h = -16t^2 + 20t. How many seconds does it take for the ball to reach its greatest height, and what is this height.
Explain how could he use technical, human and conceptual skills to maintain an environment that encourages innovation and professionalism among the virus hunters?
A man exerts a 328 N force to move a box across a 3.55-m patch of ice. How much work does he do on the box.
The moment of inertia about the axis of rotation of the remainder of his body is constant and equal to 0.450kg?m2. If the skater's original angular speed is 0.450rev/s, What is his final angular speed
Identical objects are located at the same distance from two spherical mirrors, A and B. Find the ratio fA/fB of the focal lengths of the mirrors
A home run is hit in such a way that the baseball just clears a wall 10 m high, located 124 m from home plate, Find the time it takes the ball to reach the wall
The sun falls on a concave mirror and forms an image 4.5 cm from the mirror. If an object 22 mm high is placed 12.7 cm from the mirror, where will its image be produced.
A tall tree is growing across a river from you. You would like to know the distance between yourself and the tree,as well as its height, How far away is the tree?
A 4 kg fish swimming 3 m/s swallows an absent minded 2 kg fish at rest. What is the speed of the large fish instantly after lunch.
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