The density of air at room temperature is about 1.2 g/cm3. Estimate the mass of air inside a 0.80-m3 volume refrigerator. (There are 1 million cm3 in 1 m3.)
A) 0.96 g
B) 960 kg
C) 1000 kg
D) more than 1000 kg
Answer: B
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Basalt is a common type of
A) meteoritic rock B) sedimentary rock C) igneous rock D) metamorphic rock
There are three ________ of elementary particles in the standard model.
Fill in the blank(s) with the appropriate word(s).
Consider a toroidal coil, which is essentially a solenoid bent into a circle. The field created by such a coil is
A. unidirectional. B. circular. C. axial. D. None of the above.
An object moving along a horizontal surface approaches the bottom of a ramp. At the very bottom of the ramp, point A, its speed is 40 m/s. The object goes up the ramp and reverses direction at point B
What is the height of point B above point A? The angle of inclination is 30°. Neglect friction and use g = 10 m/s2. A) 50 m B) 60 m C) 70 m D) 80 m E) 90 m