Calculate the average force a bumper would have to exert to bring a 1200-kg car to rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph)
A) 1.8 × 104 N
B) 1.6 × 104 N
C) 5.4 × 104 N
D) 6.5 × 105 N
E) 3.2 × 104 N
B
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Why is Saturn's moon Titan able to retain an atmosphere?
a. Titan only contains light gases which are easy to retain. b. Titan has a large enough mass and is cold enough. c. Titan is biologically active. d. It is so close to Saturn that Saturn's gravity retains Titan's atmosphere.
Laboratory measurements show hydrogen produces a spectral line at a wavelength of 486.1 nanometers (nm). A particular star's spectrum shows the same hydrogen line at a wavelength of 486.0 nm. What can we conclude?
A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder.
If distance from the Sun were the only factor affecting surface habitability, which of the following would be habitable?
A) the Moon B) Venus C) Mercury D) all of these
A Fraunhofer diffraction pattern is created by monochromatic light shining through which of the following?
a. single slit b. double slit c. triple slit d. more than 3 slits