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It is claimed that if a lead bullet goes fast enough, it can melt completely when it comes to a halt suddenly, and all its kinetic energy is converted into heat via friction. Find the minimum speed of a lead bullet (initial temperature = 21.0° C) for such an event to happen? (Use Lf = 2.32 104 J/kg and melting point = 327.3°C.)
_________m/s
Consider two stars, A and B, whose parallaxes are, respectively: 0.01 arcsec and 0.005 arcsec. What are the distances to each star in parsecs
In a certain particle accelerator a 5MeV beam of protons with a current of 0.5mA and beam radius of 1.5mm is shot at a target. How many protons hit the target in one second
Compute the average force the beam exerts on the pile driver while the pile driver is brought to rest
Of the charge Q initially on a tiny sphere, a portion q is to be transferred to a second, For what value of q/Q>0.5 will the electrostatic force between the two parts have 1/2 of the maximum possible value
The velocity vs. time curve of an object is an increasing straight line. What is the acceleration of the object
A child in a boat throws a 6.0 kg package out horizontally with a speed of 10m/s. Compute the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 29kg and that of the boat is 55.0 kg. Overlook water ..
A juggling bag is thrown straight up into the air and is caught 3 s later, What is the initial velocity of the bag
A subway train starts from rest at a station and accelerates at a rate of 1.50m/s2 for 14.2s. find total distance covered
A woman can read the large print in a newspaper only when it is at a distance of 59 cm or more from her eyes. What should be the refractive power (in diopters) of her glasses
The Mariana trench is located in the Pacific Ocean at a depth of about 11 000 m below the surface of the water. For comparison, determine the weight of a jetliner whose mass is 4.30 × 105 kg
An m1 = 8.0 kg box lies on a frictionless table, and is attached to a m2 = 5.0 kg box by a light cord passing over a rotating pulley. find the tension in the cord both above and below the pulley
A petite young woman distributes her 550{\rm N} weight equally over the heels of her high-heeled shoes. Each heel has an area of 0.650{\rm cm^2}. What pressure is exerted on the floor by each heel
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