An astronaut weighs 99.0 N on the Moon, where the acceleration of gravity is 1.62 m/ s2. How much does she weigh on Earth?
A)
16.2 N
B)
61.0 N
C)
99.0 N
D)
600 N
E)
440 N
D
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Why do Jupiter, Saturn, Uranus, and Neptune all have rings?
a. They were left over from solar system formation. b. They all captured particles. c. All four planets had a large moon that disintegrated. d. All have small moons and orbiting particles that constantly collide and make rings.
What is the mean free path of a gas of randomly-moving hard spheres of radius 2.00 × 10-9 m when the density of spheres is 3.00 × 1019 per cubic meter?
A) 1.17 × 10-4 m B) 4.00 × 10-9 m C) 9.76 × 10-5 m D) 1.88 × 10-3 m E) 4.69 × 10-4 m
If an electron has a wavelength of 0.123 nm, what is its kinetic energy, in electron-volts? This energy is not in the relativistic region. (melectron = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 19.8 eV B) 60.2 eV C) 80.4 eV D) 99.5 eV E) 124 eV
Besides Earth, which of the terrestrial planets and/or their satellites show(s) evidence for the possible existence of liquid water flowing on its surface in the past?
What will be an ideal response?