An electromagnetic wave is propagating towards the west. At a certain moment the direction of the magnetic field vector associated with this wave points vertically up. The direction of the electric field vector of this wave is
A) horizontal and pointing south.
B) vertical and pointing down.
C) horizontal and pointing north.
D) vertical and pointing up.
E) horizontal and pointing east.
A
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Which of the following is a reason why low-mass stars cannot get very hot when they contract?
A) They are unable to convert gravitational energy into thermal energy. B) They have limited gravitational energy. C) They get very hot and hence can ignite several nuclear fuels. D) They can sustain hydrogen fusion only if their masses are less than 0.08 solar mass.
Which terrestrial world has the highest average surface temperature?
A) Mercury B) Venus C) the Moon D) Mars E) Earth
Venus' rotation on its axis
A) is the fastest of the terrestrial planets. B) is clockwise, unlike most other solar system objects. C) is highly tilted to its orbital plane, causing large seasonal changes. D) shows it is tidally locked in its orbit around the Sun. E) prevents us from seeing all of its surface features.
A 2.10-kg hammer is transported to the Moon. The radius of the Moon is 1.74 × 106 m, its mass is 7.35 × 1022 kg, and G = 6.67 × 10-11 N ? m2/kg2. How much does the hammer weigh on Earth and on the Moon?
What will be an ideal response?