Which of the following would be the strongest clue that a rock you have found is a meteorite rather than a terrestrial rock?
A) It contains a lot of iron.
B) It is dark colored.
C) It contains elements and isotopes in proportions that are rare on Earth but common in asteroids.
D) It is too heavy for you to hold in your hand.
C) It contains elements and isotopes in proportions that are rare on Earth but common in asteroids.
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Typically, if the mass of a white dwarf increases, the white dwarf shrinks and then explodes if the mass exceeds 1.4 solar masses.
Answer the following statement true (T) or false (F)
A car weighing 5000 N is traveling along a straight level road powered by a forward drive force of 500 N. The force of air resistance is 200 N, and rolling resistance is 100 N. The net force on the car is
A) 200 N forward. B) zero. C) 300 N backward. D) 5000 N downward. E) 500 N forward.
Which of the following is not true?
1.If the average velocity of a particle over some interval is equal to zero, the instantaneous velocity of the particle over that interval may not be equal to zero at any time during the interval. 2.The instantaneous velocity of a particle can be less than its average velocity. 3.The instantaneous velocity of a particle can be greater than its average velocity. 4.If the average velocity of a particle over some interval is equal to zero, the instantaneous velocity of the particle over that interval must be equal to zero at some time during the interval.
Refer to the figure above. When the switch is closed in the primary circuit,
1) voltage is established in the primary coil 2) a current is established in the primary coil 3) a magnetic field builds up around the primary coil 4) all of the above and a voltage is induced in the secondary circuit principally because 5) of the voltage in the primary. 6) of the change of current in the primary. 7) the expanding magnetic field about the primary is sensed by the secondary.