Three identical balls are thrown from the top of a building, all with the same initial speed. The first ball is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal as in the figure below. Neglect air resistance, rank the speeds of the balls as they reach the ground, from fastest to slowest
4
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Your ears "pop" when you ascend to higher altitudes because
A) air pressure is greater at higher altitudes. B) air temperature is lower at higher altitudes. C) air pressure is lower at higher altitudes. D) air is dryer at higher altitudes.
A 30.0 cm wrench is used to generate a torque at a bolt. A force of 50.0 N is applied at the end of the wrench at an angle of 70.0 degrees. The torque generated at the bolt is
A. 10.4 N•m. B. 14.1 N•m. C. 19.7 N•m. D. 21.5 N•m. E. 26.2 N•m.
Until we sent missions to the Moon, no one on Earth had seen the far side of the Moon.
Answer the following statement true (T) or false (F)
Comparing the light from a glowing tube of neon gas and the beam of a helium-neon laser, there is a greater number of spectral lines in light from the
A) neon gas tube. B) laser beam. C) both about the same