Give three examples of the equilibrium rule that are not cited in the textbook
Fill in the blank with correct word.
Answer: Open ended. Whatever the objects listed, they must be in a non-accelerated state (no changes in their states of motion). Examples are ________, ________, and ________.
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Suppose two neutron stars or two black holes are closely orbiting one another. What do scientists predict will eventually happen to them, and why?
A) Their orbits will spiral inward until the two objects merge because of energy lost through gravitational waves. B) Their orbits will gradually grow larger because of the centrifugal force involved as they circle around each other. C) Their orbits will spiral inward as a result of friction with the surrounding gas until all the gas clears, after which their orbits will remain stable. D) The orbits would remain stable unless there were a third object orbiting along with them.
The probability of Earth being hit by a 10 km asteroid in the next few hundred million years is
A) almost certain B) impossible to predict C) zero D) small but not zero
A filament running along the x axis from the origin to x = 80.0 cm carries electric charge with uniform density. At the point P with coordinates (x = 80.0 cm, y = 80.0 cm), this filament creates electric potential 100 V. Now we add another filament along the y axis, running from the origin to y = 80.0 cm, carrying the same amount of charge with the same uniform density. At the same point P, the
pair of filaments creates potential: 1.greater than 200 V. 2.200 V. 3.100 V. 4.between 0 and 200 V. 5.0.
A proton (mass = 1.67 × 10^-27 kg) has a kinetic energy of 1.00 MeV. If its momentum is measured with an uncertainty of 2.00%, what is the minimum uncertainty in its position? (h = 6.63 × 10^-34 J×s and 1 eV = 1.6 × 10^-19 J)
a. 9.08 × 10^-14 m c. 5.64 × 10^-14 m b. 1.14 × 10^-13 m d. 2.28 × 10^-13 m