You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h. Your average speed over the 12 km drive will be
A) greater than 70 km/h.
B) equal to 70 km/h.
C) less than 70 km/h.
D) exactly 38 km/h.
E) It cannot be determined from the information given because we must also know directions traveled.
C
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When an ideal gas is expanded in volume at constant pressure, the average kinetic energy of the gas molecules
A) increases. B) decreases. C) does not change. D) may either increase or decrease, depending on whether or not the process is carried out adiabatically. E) may or may not change, but insufficient information is given to make such a determination.
Center of Mass: Three balls are moving along a straight line having the instantaneous positions shown in the figure. At that instant, find the location and velocity of the center of mass (or center of gravity) of this system.
What will be an ideal response?
The Gateway Arch in St. Louis, Missouri is 630 feet tall. Express this distance in meters and in kilometers
Newton's version of Kepler's third law states: p2 = × a3 According to this, what observational information does one need in order to calculate the combined mass of a planet and its moon?
A) the orbital period and the density of the two objects B) the average distance between the two objects and the orbital period C) the radius of the two planets in meters and the average distance between them D) It is impossible to determine the mass of any astronomical object.