How much mass, in kilograms, would be used to generate 5.0 x 1014 joules of energy?
A) 5.6 x 10-3 kg
B) 1.7 x 106 kg
C) 1.5 x 1023 kg
D) 4.5 x 1031 kg

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

Afusion reaction takes place between carbon and another element. neutrons are released, and a different element is formed. the different element is a) lighter than helium.b)heavier than helium.c)the same weight as helium.d)dependent on the element that reacted with carbon.

Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c