Sixty miles per hour is the same as
a) 129 ft/s
b) 41 ft/s
c) 21 ft/s
d) 88 ft/s
d
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A train slowly climbs a 400-m mountain track which is at an angle of 8.0° with respect to the horizontal. How much altitude does it gain?
a. 55.7 m b. 200 m c. 60.7 m d. 396 m e. 400 m
An extrasolar planet is
a. a planet that orbits our Sun that we have not yet discovered. b. one not needed for the formation of our solar system which is kept in a special area just in case. c. a planet found orbiting around a star other than the Sun. d. another name for an asteroid. e. a planet extra close to our Sun.
The Orion Nebula glows strongly in the infrared
Indicate whether the statement is true or false
An electron has the same de Broglie wavelength as the wavelength of a 1.8 eV photon. What is the speed of the electron?
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J) A) 1,100 m/s B) 980 m/s C) 910 m/s D) 840 m/s E) 770 m/s