If an astronaut lands on the moon and his mass is 60kg and gravitational strength on the Mars is 4N/kg. Find the weight of the astronaut on Mars

The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

What is the coefficient of kinetic friction μk between the block and the tabletop?

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)