An electron (m = 9.11 1031 kg) has a speed of 0.50 c. Determine the difference between its relativistic kinetic energy and the kinetic energy calculated without considering relativity.
a. 3.0 1015 J
b. 2.0 1015 J
c. 1.5 1015 J
d. 2.4 1015 J
e. 1.8 1015 J
[Ques. 2] The ______________ surrounds the nucleus of a comet.
a. head or coma
b. cloud
c. fuzz
d. cover
e. epinucleus
[Ques. 3] An example of a diverging spherical mirror is
a. a bathroom mirror.
b. a round Christmas tree ornament.
c. a flashlight reflector.
d. none of these.
[Ques. 4] An astronaut traveling with a speed v = 0.90 c holds a meterstick in his hand. If he measures its length, he will obtain a value of
a. 1.0 m
b. 2.3 m
c. 0.19 m
d. 0.43 m
e. 0.81 m
[Ques. 5] A meteor ______________ results when a large number of meteoroids enter Earth's atmosphere.
a. fall
b. landing
c. group
d. explosion
e. shower
[Ques. 6] An object is placed 5 cm to the left of a converging spherical lens. The lens has a focal length of f = 10 cm. What kind of image is formed and what is its orientation?
a. Real/Upright
b. Virtual/Upright
c. Virtual/Inverted
d. Real/Inverted
[Ques. 7] A starship navigator measures the distance between the Earth and the sun. If the ship is moving at a speed of 0.90 c, instead of obtaining 93 million miles, the navigator measures a distance (in millions of miles) of
a. 41.
b. 30.
c. 80.
d. 215.
e. 90.
[Ques. 8] The seriousness of an asteroid collision is gauged by the ______________ scale.
a. Torino
b. Richter
c. Decibel
d. Sunami
e. Star
[Ques. 9] An object is placed 5 cm to the left of a converging spherical lens. The lens has a focal length of f = 15 cm. Where is the image formed and what kind of image is formed?
a. 7.5 cm to the right of the lens, Real
b. 7.5 cm to the left of the lens, Virtual
c. 7.5 cm to the right of the lens, Virtual
d. 7.5 cm to the left of the lens, Real
[Ques. 10] A meterstick is shot from a meterstick projector at a speed of 0.90 c. How long will it be relative to an observer's frame of reference?
a. 2.3 m
b. 0.91 m
c. 1.0 m
d. 0.44 m
e. 0.81 m
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