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An electric heater carries a current of 16.5 A when operating at a voltage of 1.50 102 V. What is the resistance of the heater?
A spherical balloon has a radius of 12.5 m, and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of 1200 kg? avoid the bouyant force on the cargo volume itself.
An elevator cabin has a mass of 350.5 kg, and the combined mass of the people inside the cabin is 183.7 kg. obtain the tension in the cable
a 6000 kg struck moving at 75 km/hr hits a stopped 3000kg car. they lock bumpers and skip to a stop. find the speed of the truck and car system
A certain orthodontist uses a wire brace to align a patient's crooked tooth as in the figure below, Find the magnitude of the net force exerted by the wire on the crooked tooth
An 8,000 rocket is shot straight up from the Earth's surface with the initial speed of 800 m/s. How high does it go.
A 1.65 block is attached to a spring with spring constant 17. While the block is sitting at rest, a student hits it with the hammer and almost instantaneously gives it a speed of 59.
What would be the equilibrium temperature when a 271 g block of copper at 280°C is placed in a 169 g aluminum calorimeter cup containing 817 g of water at 11.5°C.
A small steel ball bearing with a mass of 11g is on a short compressed spring. When aimed vertically and suddenly released, spring sends the bearing to a height of 1.21 m. compute the horizontal distance the ball would travel if the same spring we..
The moon in its orbital about the earth has a centripetal acceleration about 1/4200 of that an object dropped on Earth's surface. If the moon were twice as far away what would its centripetal acceleration be?
A 0.525 kg ball starts from rest and rolls down the hill with uniform acceleration, travelling 150 m throughout the second 10.0 rm s of its motion.
A satellite orbiting the moon very near the surface has a period of 110 min, What is the free-fall acceleration on the surface of the moon in SI units
The band gap of the semiconductor gallium arsenide (GaAs) is 1.43 eV , and the bandgap for the semicondcutor aluminum gallium arsenide (AlGaAs) is 2.06 eV. find the maximum wavelength absorbed by GaAs
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