A satellite is in a circular orbit 600 km above the Earth's surface. The acceleration of gravity is 8.21 m/s2 at this altitude. The radius of the Earth is 6400 km. Determine the speed of the satellite, and the time to complete one orbit around the Earth
7580 m/s, 5 800 s
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The planet HAT-P-32b has more than twice the radius of Jupiter, yet is only the same mass. It orbits its star more than a factor of ten closer than Mercury's orbit around the Sun. Which is the most plausible explanation for its large size?
A) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. B) Planets that are close to a star are hotter, causing them to puff up. C) It is made of elements other than hydrogen and helium which do not compress under their own gravity. D) The hydrogen and helium gas compressed under their own gravity.
A square plate has an area of 29.00 cm2 at 20.0°C. It will be used in a low temperature experiment at T = 10.0K where it must have an area of 28.00 cm2 . What area must be removed form the plate at 20.0°C for it to have the correct area at 10.0 K? (The coefficient of linear expansion is 10 × 10^?6 (°C)?1.)
a. 0.079 3 cm2 b. 0.159 cm2 c. 0.238 cm2 d. 0.841 cm2 e. 0.921 cm2
During one phase of the big bang, gamma ray photons were creating electrons and positrons (anti-electrons). At this time, the Universe also contained ____
a. protons and antiprotons b. protons and neutrons c. neutrons only d. no other matter or antimatter e. neutral atoms
Terminal Voltage and Internal Resistance: You buy a AA battery in the store, and it is marked 1.5 V. If this marking is strictly accurate, while this battery is fresh
A. its terminal voltage will be more than 1.5 V when it is used in a circuit. B. its terminal voltage will be less than 1.5 V when it is used in a circuit. C. its terminal voltage will be 1.5 V when it is used in a circuit.