Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest and speeds up with constant tangential acceleration until its speed is 40 m/s. When car B has the same (tangential) velocity as car A, it is always true that:
a. it is passing car A.
b. it has the same linear (tangential) acceleration as car A.
c. it has the same centripetal acceleration as car A.
d. it has the same total acceleration as car A.
e. it has traveled farther than car A since starting.
C
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What is one possible reasons Jupiter and Saturn radiate more energy than they receive from the sun?
a. Magnetic and electric fields heat the planet. b. Fusion reactions of hydrogen into helium inside the planet provide an additional heat source. c. The planets are still radiating heat from when they first formed. d. Friction between the planet and its moons heat the planet.
Which of these radio waves would fall in the "water hole"?
A) 19 cm wavelength B) 243 cm in wavelength C) 15,000 cm in wavelength D) 150 cm in wavelength E) 6.563 × 10-5 cm in wavelength
The length and width of a rectangle are 1.125 m and 0.606 m, respectively. Multiplying, your calculator gives the product as 0.68175. Rounding properly to the correct number of significant figures, the area of the rectangle should be written as
A) 0.68 m2. B) 0.682 m2. C) 0.6818 m2. D) 0.68175 m2.
Alpha rays are
A. a form of electromagnetic radiation. B. fast-moving electrons. C. de Broglie waves. D. helium atoms stripped of their electrons.