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Question: The latent heat of vaporization of liquid nitrogen is about 200 kJ/kg. Suppose you have 6 kg of liquid nitrogen boiling at 77 K. If you supply heat at a constant rate of 45 W via an electric heater immersed in the liquid nitrogen, how long will it take to vaporize all of it? What is the time for 6 kg of liquid helium, whose heat of vaporization is 20.9 kJ/kg?
A performer seated on a trapeze is swinging back and forth with a period of 8.85 s. what will be the new period of the system
An object has a kinetic energy of 237 J and a momentum of magnitude 29.3 kg·m/s. Find the speed and the mass of the object
Suppose a plane starts from rest when the time is zero. The plane accelerates down the runway and at 29sec attains a velocity of +260 km/h, Calculate the average acceleration of the plane
Two slits are illuminated with red light ( ? = 650 nm). The slits are 0.25 mm apart and the distance to the screen is 1.25 m. What fraction of the maximum intensity on the screen is the intensity measured at a distance 3.0 mm from the central maxi..
two copper wires of the same gauge, one has a length L and the other twice that. If the first wire has a resistance R, what is the resistance of the second wire
Derive an equation for the damping torque exerted by the disk on the case due to a relative velocity of w.
A horse draws a sled horizontally on snow at constant speed. The horse can produce a power of 1.155 hp. find the speed with which the sled moves across the snow
The resistance of No.28 copper wire is 0.00213Ω/cm. The resistivity of the cdommercial copper is1.72E-8 Ωm. Find: the diameter of No.28 copper wire
In the hydraulic system shown in the figure , the piston on the left has a diameter of 4.5 and a mass of 1.8, what is the height difference between the two pistons
a person who weighs 625 n is riding a 98-n mountain bike. suppose that the entire weight of the rider and bike is
The magnetic flux through a circuit is reduced from 35 Tm^2 to 5 Tm^2 in 0.1s. The current induced in the circuit is 3.6 mA. What is the resistance to the circuit
A volltage drop of 0.00039 V is measured across a 1.2 m long piece of copper wire when 10 mA of current passes through it. What is the resistivity of copper
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