Dark dust clouds are cooler than their surroundings
Indicate whether the statement is true or false
TRUE
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When a girl swings in a tire swing, the tangential acceleration in the rope
A. is the greatest at the highest point of the motion. B. is the greatest at the lowest point of the motion. C. is the greatest at a point neither highest nor lowest. D. is constant.
Ordinary matter in the form stars and planet makes up approximately what proportion of the total mass and energy in the universe?
A) about 70 percent B) a few percent C) about 25 percent D) nearly a 100 percent
Free Fall: A package is dropped from a helicopter that is moving upward at 15 m/s. If it takes 8.0 s before the package strikes the ground, how high above the ground was the package when it was released? Neglect air resistance.
Fill in the blank(s) with the appropriate word(s).
A metallic surface is illuminated with light of wavelength 400. nm. If the work function for this metal is 2.4 eV, calculate the kinetic energy of the ejected electrons, in electron-volts
What will be an ideal response?