A substance is heated from 15°C to 45°C. What would the same incremental change be when registered in kelvins?
a. 20
c. 30
b. 40
d. 313
C
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William and Caroline Herschel's map included four of the following hypotheses in their model of the galaxy. Which one was the exception? a. They thought that the "holes in the sky" were caused by interstellar dust clouds. b. They proposed that the galaxy had a disk shape
c. They provided accurate measurements of the distances to stars. d. They placed the Sun in the center of the galaxy. e. They found errors caused by a lack of knowledge of the interstellar medium.
________ has a rotation period of 59 days, 2/3 as long as its 88 day year
Fill in the blank(s) with correct word
Which of the following is about as cheap as coal for base-load electric power today?
A) photovoltaic cells B) solar-thermal generation of electricity C) wind turbines D) All of the above. E) None of the above.
When a body moves in circular motion at constant speed the velocity and acceleration point in opposite directions
a. True b. False Indicate whether the statement is true or false