If an object of mass 8 kg has a velocity of 7 m/s, what is its linear momentum?
a. 56 kg-m/s
b. 1.1 kg-m/s
c. 0.88 kg-m/s
d. 15 kg-m/s
e. cannot be determined
a
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Radiation of intensity 
is incident on an area perpendicular to the incoming light. The area is now rotated 20 
about an axis perpendicular to the incoming light. What is the resulting power per unit area now reaching the surface?
A. 
B. 
C. 
D. 
E. 
Which of these is the smallest?
A) 1 Celsius degree B) 1 kelvin C) 1 Fahrenheit degree D) all are the same
Kepler's first law worked, where Copernicus' original heliocentric model failed, because Kepler described the orbits as
A) much larger than Copernicus had envisioned. B) complex, with epicycles to account for retrograde motions. C) around the Sun, not the Earth. D) elliptical, not circular. E) being on equants instead of epicycles.
It is much easier to build large reflectors than large refractors
Indicate whether the statement is true or false