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(a) What is the surface temperature of Betelgeuse, a red giant star in the constellation of Orion, which radiates with a peak wavelength of about 970 nm?
(b) Rigel, a bluish-white star in Orion, radiates with a peak wavelength of 145 nm. Find the temperature of Rigel's surface.
A transmission line that has a resistance of 0.5omega per km of length is used to transmit 200 MW across 300 miles. what should be the transmission voltage
A bicycle tire with a radius of 0.42 m has a linear velocity of 2.6 m/s and an tangential acceleration of - 1.0 m/s2. What is the angular velocity of the tire
a 2.5-kg mass is connected to a spring with spring constant k = 150 N/m and unstretched length 19 cm. the pair are mounted on a frictionless air table, with the free end of the spring attached to a frictionless pivot. the mass is set into circular..
You pull with a force of 295 N on a rope that is attached to the block of mass 20 kg, and the block slides across the floor at a constant speed of 1.2 m/s. The rope makes an angle of 35 degrees with the horizontal.
Two point charges 1.6cm apart have an electric potential energy -160?J . The total charge is 25nC. What are the two charges
If the air in the tube is replaced with a different gas, the frequency of the fundamental standing wave changes to 60·Hz. What is the speed of sound in this new gas
A woman throws a ball at a vertical wall d = 3.0 m away. The ball is h = 1.5 m above ground when it leaves the woman's hand with an initial velocity of 12 m/s at 45°.
q1. two astronauts each having a mass of 95.0 kg are connected by a 10.0-m rope of negligible mass. they are isolated
Two cars collide head on while each is traveling at 90. What is the temperature increase of each car
A plastic ball in a liquid is acted upon by its weight and by a buoyant force. The weight of the ball is 4.8N. The buoyant force has a magnitude of 6.5N and acts vertically upward. External force acting on the ball maintains it in the state of res..
If the rope starts at an angle of 30.0° with the vertical, illustrate what is Bruce's speed at the bottom of the swing?
suppose a solid disk of radius r3.64 cm is given an angular velocity omega54.83 rads about an axis through its center
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