If the density of the universe is equal to the critical density, and H equals 50 km/sec/Mpc, then the true age of the universe is 13.3 billion years
Indicate whether the statement is true or false
T
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How do today's human-built nuclear power plants on Earth generate energy?
A) chemical reactions B) nuclear fusion C) nuclear fission D) converting kinetic energy into electricity E) converting gravitational potential energy into electricity
The theory that different forms of animals throughout Earth's past occurred in a definite order is called the principle of
A) fossil assemblage. B) faunal succession. C) conformable fossils. D) fossil determination.
To accelerate your car at a constant acceleration, the car's engine must
A) maintain a constant power output. B) develop ever-decreasing power. C) develop ever-increasing power. D) maintain a constant turning speed.
Why couldn't you use an electric motor to turn an electrical generator that in turn provides the electrical energy for the motor?
A. Yes, you can do this B. No energy converter is 100% efficient C. Motors require AC and generators produce DC