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The earth moves around the sun in a nearly circular orbit of radius 1.50 x 1011 m. During the three summer months (an elapsed time of 7.89 x 106 s), the earth moves one-fourth of the distance around the sun.
(a) What is the average speed of the earth?
(b) What is the magnitude of the average velocity of the earth during this period?
The escape speed from a distant planet is 45 km/s. If the acceleration of gravity on the planet surface is 12.5 m/s2, What is the radius of the planet
The first car has twice the mass of a second car, but only half as much kinetic energy. What were the original speeds of the two cars
A container at 300 K contains H2 gas at a pressure of one atmosphere. At this temperature H2 obeys the Boltzmann distribution. Find to what temperature must the H2 gas be cooled before quantum effects become important
A certain capacitor in a circuit has a capacitive reactance of 30.89 ohms when the frequency is 177 Hz. What capacitive reactance does the capacitor have
The sound level in the middle of a rave is 90.0 dB. What is the sound intensity at this location
When four people with a combined mass of 305 kg sit down in a 2.0 103-kg car, The four people get out of the car and bounce it up and down. What is the frequency of the car's vibration
Two point charges of equal magnitude are d = 8.0 cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of E =45 N/C. Find the magnitude of the charges
It again strikes the floor. Find (c) the time interval from when the ball was launched to when the ball strikes the floor and (d) the horizontal distance from the point where the ball was launched to the point where the ball strikes the floor.
assuming the specific heat of the body is the same as water calculate the temperature rise due to a total body dose of
Engineers can determine properties of a structure that is modeled as damped spring oscillator-such as a bridge-by applying a driving force to it, What is the oscillator\'s damping constant? (kg/s)
Consider an Ising model of just two elementary dipoles, whose mutual interaction energy is ±ε. Enumerate the states of this system and write down their Boltzmann factors. Calculate the partition function. Find the probabilities finding of the dipo..
Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. what is the area of the leaf
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