When 1kg of a substance changes from solid to liquid at its melting point, it must absorbed an amount of heat equal to which of the following? A. specific heat of phase changes
B. specific heat capacity
C. latent heat of fusion
D. latent heat of vaporization

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?