If a gray opaque body has emissivity of 0.6, what is its reflectivity?

What will be an ideal response?


Physics & Space Science

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A plate falls vertically to the floor and breaks up into three pieces, which slide along the floor

Immediately after the impact, a 320-g piece moves along the x-axis with a speed of 2.00 m/s and a 355-g piece moves along the y-axis with a speed of 1.50 m/s. The third piece has a mass of 100 g. In what direction does the third piece move? You can neglect any horizontal forces during the crash. A) 216.9° from the x-axis B) 219.8° from the x-axis C) 36.9° from the x-axis D) 39.9° from the x-axis E) 39.8° from the x-axis

Physics & Space Science

While luminous enough to be seen with the naked eye, Supernova 1987A was, in fact, in our companion galaxy, the Large Magellanic Cloud

Indicate whether the statement is true or false

Physics & Space Science

A light bulb designed for use with AC would still work if hooked up to DC of the proper voltage

Indicate whether the statement is true or false

Physics & Space Science

A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming negligible air resistance?

A) 9.8 m/s upward B) 9.8 m/s downward C) 0 m/s D) 19.6 m/s downward

Physics & Space Science