A steady horizontal force lasting for 2.1 s gives a 1.25 kg object an acceleration of 3.2 m/s2 on a frictionless table. What impulse does this force give to the object?
A) 11 kg ? m/s B) 26 kg ? m/s C) 2.6 kg ? m/s D) 8.4 kg ? m/s
D
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The visual appearance of Neptune is much bluer than Uranus
Indicate whether the statement is true or false
At a certain instant in time, the field of an electromagnetic wave in a vacuum points in the -z direction, and the field points in the +y direction. In what direction is this wave traveling?
A) +x direction B) -x direction C) +y direction D) -z direction E) +z direction
The circuit below contains 3 100-W light bulbs and a capacitor. The emf is 110 V. Which light bulb(s) is(are) brightest? (Assume the capacitor is fully charged.)
a.
A
b.
B
c.
C
d.
A and B
e.
All three are equally bright.
Which of the following best describes how the Drake equation is useful?
A) It helps us understand what we need to know to determine the likelihood of finding other civilizations. B) It has allowed us to determine the number of civilizations in the Milky Way Galaxy. C) It allows us to calculate the masses of planets orbiting other stars. D) It tells us what wavelengths of light will be most useful to examine in the search for extraterrestrial intelligence.