If a non-rotating object has no acceleration, then we can say for certain that it is
A) at rest.
B) moving at constant nonzero velocity.
C) in mechanical equilibrium.
D) all of the above
E) none of the above
Answer: C
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If cooking is done using an aluminum pan over an electric burner, which of the following will not promote the rate of heat flow from burner to food?
a. increase pan bottom thickness c. increase burner temperature b. increase pan bottom area d. decrease height of pan sides
What types of stars end their lives with supernovae?
A) all stars that are red in color B) all stars that are yellow in color C) high-mass stars that can continue to have core fusion until they have iron cores D) stars that are similar in mass to the Sun E) stars that have reached an age of 10 billion years
What is the total mass of a binary star system with P = 20 yr and a = 10 AU?
a. 2 solar masses b. 2.5 solar masses c. 0.5 solar mass d. 80 solar masses e. 0.4 solar mass
Wave Characteristics: A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm. What is the highest frequency associated with this portion of the spectrum? (c = 3.00 × 108 m/s)
A. 1.50 × 1014 Hz B. 7.50 × 1013 Hz C. 7.50 × 1014 Hz D. 7.50 × 1015 Hz E. 1.50 × 1015 Hz