Which of the following statements about the Sun is an inference from a model, not an observation?
A) The photosphere emits visible light.
B) The Sun emits neutrinos.
C) The convection zone is cooler than the radiation zone.
D) The corona is hotter than the photosphere.
C
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Rocks can begin to melt if
A) a decrease in pressure results in a sufficient decrease in the rock's melting point. B) the rock's water content increases thereby decreasing the rock's melting point. C) heated by rising magma from the Earth's interior. D) all of the above. E) none of the above.
List the three useful ways in physics to multiply vectors
What will be an ideal response?
Which of these electromagnetic waves have the longest wavelength?
A) radio waves B) infrared waves C) X-rays D) ultraviolet waves E) light waves
A 50-kg child riding a Ferris wheel (radius = 10 m) travels in a vertical circle. The wheel completes one revolution every 10 s. What is the magnitude of the force on the child by the seat at the highest point on the circular path?
a. 0.29 kN b. 0.49 kN c. 0.69 kN d. 0.20 kN e. 0.40 kN