Gravity obeys an inverse square relation. This statement implies that the force due to gravity between two masses
a. will increase as the distance between the two masses increases.
b. will decrease as the square of the distance between the two masses increases.
c. will cause the two masses to move away from each other.
d. will cause the two masses to move in a straight line.
e. will cause the two masses to orbit each other.
B
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One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
What is the power output, in hp, of this engine?
When we add a displacement vector to another displacement vector, the result is
a. a velocity. b. an acceleration. c. another displacement. d. a scalar.
The ability of a steel to be hardened to a specific depth is the _________.
Fill in the blank(s) with the appropriate word(s).
One type of early protocell (pre-cells) probably consisted of small droplets of
A) water B) clay C) concentrated amino acids D) nucleic acids