The region of the electromagnetic spectrum with frequencies just less than those in the visible region is the ______________ region
a. infrared
b. gamma rays
c. radio waves
d. microwaves
e. x-rays
a
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The figure shows a uniform, horizontal beam (length = 10 m, mass = 25 kg) that is pivoted at the wall, with its far end supported by a cable that makes an angle of 51° with the horizontal. If a person (mass = 60 kg) stands 3.0 m from the pivot, what is the tension in the cable?
A. 0.83 kN B. 0.30 kN C. 0.38 kN D. 0.42 kN E. 3.0 kN
The trajectory of a cannonball fired from a canon depends on
1) the initial velocity. 2) the angle of projection. 3) the effects of air resistance. 4) all of these. When air resistance does affect motion, the cannonball doesn't travel 5) as high. 6) as far. 7) as high and as far.
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.
The least massive stars, including our sun, eventually end their lives as
A) neutron stars. B) red giants. C) black holes. D) white dwarfs. E) quasars.