A 25 cm focal length mirror has a 3.0 cm tall object placed 20 cm in front of it. Where is the image, and is it real or virtual?
A. 5.0 cm behind the mirror, virtual
B. 11 cm in front of the mirror, real
C. 100 cm in front of the mirror, real
D. 100 cm behind the mirror, virtual
E. 45 cm behind the mirror, virtual
D. 100 cm behind the mirror, virtual
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Why do we have seasons on Earth?
a) Season are caused the Sun moving through the constellations of the zodiac b) the spin axis of the Earth titled 23.5 with respect to a line normal to the plane of orbit c) the earth's distance from the Sun varies, so that it is summer the we are closer to the Sun and winter when we are farther from the Sun The spin axis of the Earth is titled 23.5 with respect to a line normal to the plane of orbit
The average distance of the electron from the proton in the hydrogen atom is 0.65 × 10^?10 m. What is the electric field from the proton's charge at the location of the electron? (ke = 8.99 × 10^9 N/m2/C2, e = 1.6 × 10^?19 C)
a. 3.4E+11 N/C b. 5.4E+6 N/C c. 5.2E+1 N/C d. 2.2E–8 N/C e. 1.0E–8 N/C
On planet X, the pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2
At a depth 5.00 m below the surface, the pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3. (a) What is the atmospheric pressure at the surface of the lake? (b) What is the acceleration of gravity on planet X?
The evidence favors a universe whose overall geometry is flat. That evidence comes from observations of
A) the earliest galaxies in the universe. B) the force of gravity acting on laboratory objects. C) the center of our galaxy. D) the cosmic background radiation. E) distant quasars.