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A sphere that is a perfect blackbody radiator has a radius of 0.080 m and is at 250°C in a room where the temperature is 29°C. Calculate the net rate at which the sphere radiates energy.
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When the sodium salt of an organic acid is strongly heated, it yields sodium carbonate. If the weight ratio of the sodium salt to sodium carbonate obtained is 5 : 4, what is the equivalent weight of the acid ?
In a 45° - 90° - 45° prism with a ray of light entering and exiting on the long side of the prism after undergoing two total internal reflections. Determine the minimum index of refraction of the prism in order for this to occur
A large wooden turntable in the shape of a flat uniform disk has a radius of 2.00 {\rm m} and a total mass of 120kg. Find the angular speed of the turntable after the parachutist lands
A high-voltage transmission line with a resistance of 0.34 omegacap.gif/km carries a current of 960 A. What is the power loss due to resistance in the line
A 240-kg speedboat is negotiating a circular turn (radius = 36 m) around a buoy. During the turn, the engine causes a net tangential force of magnitude 590 N to be applied to the boat. The initial tangential speed of the boat going into the turn is 7..
The image of an object placed 30cm from the lens is formed at 20 cm from the lens on the other side. Find the refractive index of the material of the lens.
An object-spring system oscillates with amplitude of 3.00cm. If the spring constant is 205 N/m and object has a mass of 0.50 kg, determine each of the following values.
A solid cylinder is rolled down a ramp. They cylinder starts 0.29 m above the level surface below. If it starts at rest, what is the speed of the center of mass as it reaches the level surface
The activity of a freshly prepared radioactive sample is 1010 disintegrations per second, whose mean life is 109 s. find the mass (in mg) of the radioactive sample
A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 10 A, and that of the vacuum cleaner is 5.0 A, Determine the power consumed by the blow-dryer
A potter's wheel (a solid, uniform disk) of mass 6.0kg and radius 25cm spins about its central axis with an angular speed of the wheel is 15rpm. Find the new angular speed of the system
While landing, the rotor of a helicopter slows from an angular speed of 4500 rpm to rest in 5 seconds. How many revolutions does the rotor travel during this time
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