You drive 6.00 km at 50.0 km/h and then another 6.00 km at 90.0 km/h. Your average speed over the 12.0 km drive will be
A) greater than 70.0 km/h.
B) equal to 70.0 km/h.
C) less than 70.0 km/h.
D) exactly 38.0 km/h.
E) cannot be determined from the information given, must also know directions traveled
C
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We expect a scientific theory to be able to make predictions that can be tested. Which of the following is a prediction of the nebular theory that has been verified by observations?
a. Large planets should have at least some moons that are larger than the smallest planets. b. Planetary orbits should lie in approximately the same plane as the disk of the Milky Way Galaxy. c. Earth-size planets should have fairly large moons. d. Many stars should have planets.
The human eye is sensitive to light with wavelength up to 750 nm. What is the frequency of radiation at this wavelength? (1 nm = 10-9 m and c = 3.00 × 10^8 m/s)
a. 8.5 × 10^8 Hz c. 4.0 × 10^14 Hz b. 1.8 × 10^8 Hz d. 7.7 × 10^14 Hz
Double-Slit Interference: In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750 nm and 900 nm, illuminate the slits. A screen is placed 2.0 m from the slits. At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other?
A. 1.5 mm B. 3.0 mm C. 4.5 mm D. 6.0 mm
Identify a true statement about the Sun
A) It is the smallest star in the Universe. B) It is at a distance of 2 AU from Earth. C) It shines by reflecting light from the Moon. D) It generates its own energy.