A mass which weighs 19.6 Newtons on Earth is 2.3 meters away from a 2.00 kg mass
(a) Determine their mutual gravitational attraction to each other.
(b) How much work would have to be done to put a very large distance between the two masses?
(a) 5.0 × 10-11 N
(b) 12. × 10-11 Joules
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•At the initial instant the universe contains
• (a) atoms (b) Protons (c) Electons (d) photons
Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a thermodynamic pump
What is its thermal efficiency when operated as a thermodynamic engine doing work? A) 10% B) 20% C) 25% D) 45% E) 80%
The three major types of seawater movement are ______________, currents, and tides
Fill in the blank(s) with correct word
When discussing stellar lives, astronomers divide stars by mass into low-mass, intermediate-mass, and high-mass stars. Which category includes our Sun?
A) The Sun is a low-mass star. B) The Sun is an intermediate-mass star. C) The Sun is a high-mass star.