Which of the following indicates that past conditions on Mars may have been suitable for life?
A) There are very large extinct volcanoes on Mars.
B) Mars has two small Moons, Phobos, and Deimos.
C) There are dried up riverbeds, rock-strewn floodplains, and minerals that form in water.
D) Mars has polar caps.
E) Mars has been studied by numerous spacecraft, including both orbiters and landers.
C) There are dried up riverbeds, rock-strewn floodplains, and minerals that form in water.
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A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest in the rocket,
A) the light will reach the front of the rocket at the same instant that it reaches the back of the rocket. B) the light will reach the front of the rocket before it reaches the back of the rocket. C) the light will reach the front of the rocket after it reaches the back of the rocket.
A nonrelativistic electron has a kinetic energy of 5.4 eV. What is the energy of a photon whose wavelength is the same as the de Broglie wavelength of the electron? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
A) 2.0 keV B) 2.7 keV C) 2.5 keV D) 2.2 keV E) 2.4 keV
Geologists refer to remnants of ancient organisms that have changed rapidly in a well defined way to adapt to changing environmental conditions as
a) grading samples. b) correlation tools. c) human time scale pointers. d) index fossils.
If R = 3.0 k?, C = 6.0 nF, ? 1 = 10.0 V, Q = 18 nC, ? 2 = 6.0 V, and I = 5.0 mA, what is the potential difference Vb ? Va?
a.
?13 V
b.
+28 V
c.
+13 V
d.
?28 V
e.
+2.0 V