A neutral aqueous solution has a pH of ______________
Fill in the blank(s) with correct word
7
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What is a Cepheid variable?
A) It is a bright source of variable X-ray emission, thought to harbor a supermassive black hole. B) It is a type of very luminous star that makes an excellent standard candle. C) It is a main-sequence star of spectral type B5. D) It is a type of galaxy that varies in its light output.
Electric generating plants are usually rated in "megawatts". This is a unit of
A) force. B) power. C) energy. D) both energy and work. E) work.
As you go higher and higher above the surface of the Earth, the mass of a body __________
Fill in the blank(s) with correct word
An initially installed flywheel can store 106 J of kinetic energy when rotating at 300 rad/s. It is replaced by another flywheel of the same size but made of a stronger material. If its mass is the same as that of the original, and it is now capable of achieving a rotational speed of 600 rad/s, what maximum energy can be stored?
a. 40 × 10^5 J c. 10 × 10^5 J b. 20 × 10^5 J d. 5.0 × 10^5 J