The speed of a boat is often given in knots. If a speed of 5 knots were expressed in the SI system of units, the units would be:
a. m.
b. s.
c. m/s.
d. kg/s.
c
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Georgia moves an unattached piece of wire back and forth over a magnet. Which best explains what will happen?
A. a current will be induced because the wire moves through a magnetic field. B. a current will not be induced because the wire moves through a magnetic field. C. a current will be induced because the wire is not part of a closed circuit. D. a current will not be induced because the wire is not part of a closed circuit.
The main source of energy for a star as it grows in size to become a red giant is ________
A) hydrogen fusion in a shell surrounding the central core B) gravitational contraction C) helium fusion in the central core D) hydrogen fusion in the central core
A mass-spring system on a horizontal frictionless surface is set in simple harmonic motion with amplitude A. The mass is then doubled and the system is again set into simple harmonic motion with the same amplitude. Which of the following is true about the total mechanical energy of the system due to doubling the mass?
a. It has doubled. c. It has halved. b. It has quadrupled. d. It has not changed.
The strong force is the force that
A) binds electrons to the nucleus in an atom B) holds the moon in orbit around Earth C) binds protons and neutrons together to form a nucleus D) creates the magnetic field associated with sunspots