A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse it has received from the gravitational force is
a. 9.80 N s.
b. 19.6 N s.
c. 29.4 N s.
d. 58.8 N s.
e. 118 N s.
d
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Indicate whether the statement is true or false
What is true of an element of atomic number 15 that has an isotope of mass number 32? (There could be more than one correct choice.)
A) the number of protons in the nucleus is 15. B) the number of neutrons in the nucleus is 17. C) the number of protons in the nucleus is 32. D) the number of neutrons in the nucleus is 15. E) the number of nucleons in the nucleus is 47.
If in a gas the opacity is high, then energy transport is by _____________
a. conduction b. convection c. radiation d. All of the other choices are correct.
The ampere is defined
A) as a coulomb-second. B) as 4? × 10-5 SI units. C) as a coulomb/second2. D) as 4? × 10-7 SI units. E) using the force between current carrying wires.