Question 2.A new star with a mass of 3.4 x 1031 kg is discovered 6.7 x 1011 m away from our sun whose mass is2.0 1030 kg . What is the force of
gravitation between this star and our sun? *
G = 6.67 X10-11 N•m²/kg?
O A.1.0 x 1028 N
B. 1.5 x 1038 N
C. 6.8 x 1039 N
D. There is no gravitational force between them because stars have no gravity.

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to