What is the minimum energy needed to lift 1.0 kg to a height of 200. km and to give it a speed of 8.0 km/s? (Neglect the small decrease of "g" over that distance.)
A) 34. TJ
B) 34. kJ
C) 34. MJ
D) 34. GJ
E) 34. J
C
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The range of wavelengths for the "water hole" is ________ cm
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If a barbell weighs 10 pounds on the Moon, what would it weigh on Earth?
A. 30 pounds. Surface gravity on Earth is 3 times that on the Moon. B. 10 pounds. Gravity is the same on Earth and the Moon. C. 60 pounds. Surface gravity on Earth is 6 times that on the Moon. D. 1.67 pounds. Surface gravity on the Moon is 1/6 that on Earth.
Brick A is dropped from the top of a building. Brick B is thrown straight down from the same building, and neither one experiences appreciable air resistance. Which statement about their accelerations is correct?
A) The acceleration of A is greater than the acceleration of B. B) The acceleration of B is greater than the acceleration of A. C) The two bricks have exactly the same acceleration. D) Neither brick has any acceleration once it is released.
Terrence goes for a walk. He walks 2.0 km north, then turns and walks 4.0 km south of east. What is his displacement vector? Take east to be in the +-direction and north to be in the +-direction.
a. (2.0 + 4.0 ) km b. (2.8 – 0.8 ) km c. (4.8 + 5.7 ) km d. (5.7 – 2.8 ) km