Venus has about 4/5 the mass of the Earth and has an orbital radius around the Sun about 5/7 of Earth’s. Which gives the relationship of the gravitational attraction between Venus and the Sun (FV) to that between the Earth and the Sun (FE)?

FV = FE

FV < FE

Cannot be determined without the Sun's mass

FV > FE

You and a friend each carry a 15kg suitcase up two flights of stairs walking at a constant speed. Take each suitcase to be a system. Suppose you carry the suitcase up the stairs in 30s while your friend takes 60s. Which of the following is true?

Both of you did equal work but you expended less power

Your friend did more work but expended less power

You did more work and also expended more power

You did more work, but both of you expended same power

Both of you did equal work but you expended more power

An acceleration vector a has magnitude 8.0 m/s2 and has an angle of 54 degrees above the positive x axis. What are this vector’s x and y components? Drawing a diagram may help.

ax = 4.7 m/s2 ; ay = 6.5 m/s2

ax = 6.5 m/s2 ; ay = 4.7 m/s2

ax = 4.7 m/s2 ; ay = -6.5 m/s2

ax = -4.7 m/s2 ; ay = 6.5 m/s2