What is the main process by which heat flows upward through the lithosphere?
A) conduction
B) convection
C) radiation
D) accretion
E) differentiation
A) conduction
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If the entire history of the Earth was scaled to a time line the length of a football field, human civilization would occupy what proportion of the field?
A) a sliver no thicker than a piece of paper B) a silver no thicker than an atom C) about a quarter of the field D) about a half of the field
How do we know that pulsars must be neutron stars?
A) Pulsars have the same upper mass limit as neutron stars do. B) No massive object, other than a neutron star, could spin as fast as we observe pulsars to spin and remain intact. C) This is only a theory that has not yet been confirmed by observations. D) We have observed massive-star supernovae produce pulsars. E) Telescopic images of pulsars and neutron stars look exactly the same.
The magnetic force on a circular loop of wire of radius r carrying current I around it is zero N
Indicate whether the statement is true or false
Two speakers are placed side by side and driven by the same frequency of 0.50 kHz. If the distance from a person to one speaker is 5.0 m and the person detects little or no sound,
which of the following is a possible the distance from the person to the other speaker? The sound speed in the room is 340 m/s. A) 7.7 m B) 8.1 m C) 8.4 m D) 9.1 m