2 In order for a space shuttle to be launched from Earth into space, rocket forces must be
A.
kept to zero during the launch.
B. less than the gravitational force.
C. equal to the gravitational force.
D. greater than the gravitational force.

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j