Which body glows with electromagnetic waves?

A) the Sun
B) the Earth
C) you and your classmates
D) all of the above


Answer: D

Physics & Space Science

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A concave mirror has a focal length of 20 cm. What is the magnification if the object and image distances are 10 cm and ?20 cm, respectively?

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You stand on a scale to measure your weight. The reaction to the force the Earth exerts on you is

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Three long, straight, parallel wires each carry a current of 10 A in the positive x direction. If the distance between each wire and the other two is 10 cm, what is the magnitude of the magnetic force on a 20-cm length of either of the wires?

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If the velocity of an object is zero, then that object cannot be accelerating

A) True B) False

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