Asatellite in circular orbit around the earth moves at constant speed. this orbit is maintained by the force of gravity between the earth and the satellite, yet no work is done on the satellite. how is this possible?
a. no work is done if there is no contact between objects.
b. no work is done because there is no gravity in space.
c. no work is done if the direction of motion is perpendicular to the force.
d. no work is done if objects move in a circle.
answer; ///i believe that the correct answer is (carbon); ///// good luck
use the formula: v^2=(3kt)/m
v is the velocity of a molecule
k is the boltzmann constant (1.38064852e-23 j/k)
t is the temperature of the molecule in the air
m is the mass of the molecule
for an h2 molecule at 20.0°c (293 k):
v^2 = 3 × 1.38e-23 j/k × 293 k / (2.00 u × 1.66e-27 kg/u)
v^2 = 3.65e+6 m^2/s^2
v = 1.91e+3 m/s
for an o2 molecule at same temp.:
v^2 = 3 × 1.38e-23 j/k × 293 k / (32.00 u × 1.66e-27 kg/u)
v^2 = 2.28e+5 m^2/s^2
v = 478 m/s
therefore, the ratio of h2: o2 velocities is:
1.91e+3 / 478 = 4.00
the first practical realisation of the metric system came in 1799, during the french revolution, when the existing system of measures, which had become impractical for trade, was replaced by a decimal system based on the kilogram and the metre.
it would be 0.338 kcal, which would round off to 0.34.