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As 771.0 kg copper bar is put into a smelter for melting. The initial temperature of the copper is 300.0 K. How much heat must the smelter produce to completely melt the copper bar? (The specific heat for copper is 386 J/kg · K, the heat of fusion for copper is 205 kJ/kg, and its melting point is 1357 K.)
the absolute portential at the exact center of a square is 3.0v when a charge of +Q is located at one of the squares corners. What is the absolute potential at the squares center
Two motorcycles are traveling in opposite directions at the same speed when one of the cyclists blasts his horn, what is the speed of the motorcycles
An intergalactic rock star bangs his drum every 1.30 s. A person on earth measures that the time between beats is 2.30 s. How fast is the rock star moving relative to the earth
A gold nucleus contains 197 nucleons packed tightly against each other. A single nucleon (proton or neutron) has a radius of about 1.310-15 m. Calculate the approximate radius of the gold nucleus. (Hint: Remember that the volume of a sphere is (4/..
at the surface of the earth what is the force on the rocket due to gravity when the rocket has reached an altitude of 1.2 x 104 km
A box of textbooks of mass 25.3kg rests on a loading ramp that makes an angle a with the horizontal. find the acceleration once the box has begun to move
A 100 [kg] cannon fires a 10 [kg] steel ball horizontally with a speed of 50 [m/s]. What is the recoil speed of the cannon
Bill can throw a ball vertically at a speed 1.4 times faster than Joe can. How many times higher will Bill's ball go than Joe's
While the repair shop works on your voltmeter, they loan you an unusual replacement: Rather than measuring the potential difference across a resistor, it measures the amount of charge that flowed, and the change in electric potential energy of tha..
An unknown nucleus has twice the volume of a nucleus with 62 nucleons. What is the atomic mass number of the unknown nucleus
A proton is passing the origin. The magnetic field at the (x,y,z) position ( 1mm , 0 mm, 0 mm)is 1.0×10?13?^T. what is the direction of the proton
Two metal spheres are separated by a distance of 0.8 cm and a power supply maintains a constant potential difference of 770 V between them. what is the distance between the spheres at this time
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