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A 1.00 kg block of copper at 20.0°C is lowered into a large insulated container of liquid ammonia at its boiling point (-33.3°C). If the specific heat of copper is 387 J/kg°C and heat of vaporization of liquid ammonia is 1371 kJ/kg, determine the mass of liquid ammonia that boils away before thermal equilibrium. Assume an excessive amount of liquid ammonia is present and that the liquid ammonia does not react with the copper.
At what rate is the flywheel spinning while the power comes back on. How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on.
A car is behind a truck going 25m/s on the highway. The car's driver looks for an opportunity to pass, guessing that his car can accelerate at 1.0m/s2. He gauges that he has to cover the 20-m length of the truck, plus 10m clear room at the rear of..
Calculate the location of the center of mass of the Earth-Moon-Sun system during a full Moon. A full Moon occurs when the Earth, Moon, and Sun are lined up. make Use of a coordinate system in which the center of the sun is at x=0 and the Earth and..
An athlete at the gym holds a 2.5 kg steel ball in his hand. His arm is 70 cm long and has a mass of 4-kg. What is the magnitude of the torque about his muster if he holds his arm straight out to his side, parallel to the floor.
Two speakers, 6.00 m apart, are driven by the same audio oscillator so that each one produces a sound consisting of two distinct frequencies, 1000 Hz and 1360 Hz. The speed of sound in the room is 350 m/s.
A rocket has an initial mass of 28,000 kg, of which 20 percent is the payload. It burns fuel at a rate of 185 kg/s and exhausts its gas at a relative speed of 1.8 km/s.
An electric field of intensity 2.5 kN/C is applied along the x-axis. Calculate the electric flux through a rectangular plane 0.350 m wide and 0.70 m long if the following conditions are true.
Radioactive isotopes frequently occur together in mixtures. Assume a 400g sample contains, with a half-life of 12 days, and, with a half-life of 4.5 days. If there are firstly twice as many calcium atoms as there are barium atoms, what will be the ra..
A 258-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.980, and the log has ..
Two insulated wires, each 2.50 m long, are taped together to form a two-wire unit that is 2.50 m long. One wire carries a current of 7A; the other carries a smaller current I in the opposite direction. The two wire unit is placed at an angle of 78..
A Michelson interferometer uses light from glowing hydrogen at 486.1 nm. As you move one mirror, 530 bright fringes pass a fixed point in the viewer. How far did the mirror move.
What is the average induced emf in the coil in mV. If he is crossing a river where the current is 1.60 km/h, in what direction should his boat be headed if he wants to reach the point directly opposite his starting point.
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