What is the wavelength of peak emission for a black body at 37°C?
(c = 3.0 × 108 m/s, Wien displacement law constant is 2.9 × 10-3 m ? K, ? = 5.67 × 10-8 W/m2 ? K4)
A) 94 µm B) 78 µm C) 7.8 µm D) 9.4 µm E) 29 µm
D
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Which of the following most clearly distinguishes asteroids and comets from planets?
A) Asteroids and comets are much smaller than planets. B) Asteroids and comets are made of different materials than any planets. C) Unlike planets, asteroids and comets do not orbit the Sun. D) Asteroids and comets are only found at much greater distances from the Sun than planets.
Why is Venus's day so long (a day-night cycle on Venus lasts for as long as 243 Earth day and night cycles)?
A. No one knows the reason. B. Venus's rotation time is very long compared to the time it takes to go once around the Sun. C. Because Venus's year is longer than a year on Earth. D. Venus's rotation time is very short compared to the time it takes to go once around the Sun. E. Because Venus's year is shorter than a year on Earth.
Mars' magnetic field is so weak because:
A) it spins much slower than Earth does. B) it core may no longer be molten. C) its core contains less iron than our own. D) Both B and C are probable. E) All of the above are correct.
A 3.0-kg block moves up a 40° incline with constant speed under the action of a 26-N force acting up and parallel to the incline. What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?
a. 14 N b. 12 N c. 16 N d. 18 N e. 25 N