As the temperature of a blackbody increases, what happens to the peak wavelength of the light it radiates?
A) It gets longer.
B) It gets shorter.
C) The wavelength is not affected by the temperature of the object.
B
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Kepler's first law of planetary motion implies that:
A) the planets move at constant speeds at all points in their orbits. B) all the planets move around Earth in elliptical orbits. C) uniform circular motion is adequate to describe the motion of all the planets. D) the planets move in elliptical orbits around the Sun.
According to the solar nebula theory, Earth and the other planets of the Solar System formed billions of years ago as the Sun _______________ from a cloud of interstellar gas and dust
Fill in the blank(s) with correct word
Two students are working on the same constant-acceleration problem involving a car undergoing constant acceleration, having started from rest and after a certain time having traveled a distance of 108 m. The students are to find the average velocity. Both students are required to show their work and round any intermediate answers as well as the final answer properly to 3 significant figures. Each
rounded answer is to be used in the next step of calculation as they proceed. For the final answer, Student A uses the formula vavg = (xf – xi)/(tf – ti) getting the result 7.26 m/s, and Student B uses the formula vavg = (v0 + v)/2 getting the result 7.29 m/s. Assuming neither student makes a mistake, which student has the better answer? a. Student A b. Student B c. Under significant figure rounding, both answers are equally as good. d. The described result cannot happen; this is physics after all.
Evaporation of raindrops in the atmosphere
A) warms the air. B) cools the air. C) does not happen, raindrops always reach Earth's surface. D) is greatest above polar ice caps.