Which of the following is true of both nuclear fusion and nuclear fission?

a. they both require a high energy input.
b. they both occur without byproducts.
c. they both have a high energy output.
d. they both involve large atoms breaking into smaller atoms.

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Can anyone answer these questions? ? i need it before 1: 00pm today

Sandy is building a small toy car. he wants to use a balloon to power the toy car. he fills a balloon with air and then attaches a straw to the balloon. he tapes the balloon-straw combination to the car and then releases the end of the balloon. the toy moves forward as the air from the balloon comes out the back of the straw. what can sandy do to make the toy car move faster? a) use less air in the balloon. b) blow up the balloon more. c) use a longer straw. d) use larger tires.