The image formed by convex lenses are
A)
always upright.
B)
always real.
C)
always virtual.
D)
always inverted.
E)
none of the above.
E
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Which of the following hypotheses for the origins of the Moon is generally accepted by astronomers?
A. The Moon is the result of a collision between Earth and a Mars-sized object in the early days of the solar system (the collision theory). B. The Moon formed somewhere else and was later captured by Earth (capture theory). C. The Moon formed alongside Earth (the twin theory). D. The Moon was originally a bulge on Earth that was flung off by the rapidly spinning Earth (fission theory).
When an unstable Co nucleus undergoes beta decay, the nucleus formed is that of
a. Co. b. Cu. c. Fe. d. Mn. e. Ni.
Why was Voyager 2 an extremely efficient and productive probe?
What will be an ideal response?
A large telescope of mass 8410 kg is in a circular orbit around the earth, making one revolution every 927 minutes. What is the magnitude of the gravitational force exerted on the satellite by the earth?
(G = 6.67 × 10-11 N ? m2/kg2, Mearth = 6.0 × 1024 kg)