Scientists are in agreement that any world harboring living things must have significant quantities of:
A) helium and hydrogen.
B) oxygen and nitrogen.
C) some type of liquid.
D) some type of sugar.
C
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A cube of copper 0.10 meters on each side has an average grain size of 10 × 10-6 m. The average grain boundary energy of copper is 625 × 10-3 J/m2 . Assume that all of the grains are cubes 10 × 10-6 m across.
Electromagnetic waves consist of
A) compressions and rarefactions of electromagnetic pulses. B) oscillating electric and magnetic fields. C) particles of light energy. D) high-frequency sound waves.
The difference between speed and velocity is that
A) they are expressed in different units. B) velocity also includes a direction. C) velocity is the same as acceleration but speed is different. D) velocity is calculated using a physics equation.
Pairs of forces of equal magnitude act on identical cylinders as shown in the figures. In which example is the cylinder in translational and rotational equilibrium?
A.
B.
C.
D.
E.
