A toy rocket, launched from the ground, rises vertically with an acceleration of 20 m/s2 for 6.0 s until its motor stops. Disregarding any air resistance, what maximum height above the ground will the rocket achieve?
a. 1.1 km
b. 0.73 km
c. 1.9 km
d. 0.39 km
e. 1.5 km
a
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How much energy is stored in the 50-?F capacitor when Va?Vb = 22 V?
?
?
A. 0.78 mJ B. 0.58 mJ C. 0.68 mJ D. 0.48 mJ E. 0.22 mJ
When carbon and oxygen atoms combine, energy is
A) absorbed by the reaction. B) released by the reaction. C) not involved.
The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence greater than this angle will be
A) absorbed. B) totally reflected. C) partially reflected and partially transmitted. D) totally transmitted. E) totally polarized.
Planets do not move in precise ellipses, as had been thought by Kepler, because of
A) dust grains and other material that disturbs the orbits. B) influences due to the other planets. C) Both of the above. D) Nonsense--the planets actually do move in precise ellipses.