18) As planets interact with the Sun in our solar system, the force of gravity plays a role in their revolutionary orbit. Which
of these describes how the planets revolve around the sun due to its gravitational pull?
1)
A)
The planets have a linear path back and forth past the Sun.
B)
The planets have a circular path with the Sun at the center of the circle.
The Sun rotates around the planets, which are stationary in the solar
system.
The planets have an elliptical path with the Sun at one of the foci of the
ellipse.
)
D)

1. consider the case in which air fills air shocks on a truck trailer. the pressure in the shocks is 2 mpa. the temperature is 300 k. the diameter of the shock piston is 10 cm and the initial length of the cylindrical cavity containing the compressed air is 40 cm. a. the truck is gradually loaded over a period of a day in a static setting. the temperature is held constant for the atmosphere and thus for the gas shock. calculate the compressibility of the air in the shock for this condition when the truck is initially being loaded. b. if the shocks were loaded in a dynamic setting by driving over bumps, what would be the compressibility? state your assumption. c. what is the initial load on the shock if the shock is in an atmospheric 100 kpa? d. if the shock is compressed using the process described in part a, and the air shock compressed air cavity length decreases to 20 cm, what is the additional load applied to the shock?

There are weak or strong attractive forces between atoms of liquids with a high viscosity

How will the system respond to a temperature increase?