You are observing the wobble of a star caused by the orbit of a planet around that star. Which property of this system listed below most signi?cantly affects the period of that wobble?
A) the planet's orbital radius B) the planet's mass
C) both the planet's orbital radius and its mass D) neither the planet's orbital radius nor its mass
A
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A 2.0-?F capacitor is charged to 12 V and then discharged through a 4.0 × 106 ? resistor. How long will it take for the voltage across the capacitor to drop to 3.0 V?
A) 4.5 s B) 8.0 s C) 11 s D) 22 s E) 24 s
Why is thermal escape of atmospheric gas much easier from the Moon than from Earth?
A) because the Moon's gravity is so much weaker than Earth's B) because the Moon's average surface temperature is lower than Earth's C) because the Moon lacks a global magnetic field, while Earth has one D) Outgassing on the Moon releases gases with lower masses than does outgassing on Earth.
Einstein's equation E = mc2 describes the conversion of mass to energy that occurs during nuclear fusion. If a billion joules of energy are released by this process, how much mass has been consumed? (Recall, a joule is a Nt-m or kg-m2/s2 and the speed of light is ~300 million m/s.)
When a laboratory sample of unknown mass is placed on a vertical spring-scale having a spring constant of 467 N/m, the system obeys the equation y = (4.4 cm) cos(33.3 s-1 t). What is the mass of this laboratory sample?
What will be an ideal response?