WILL GIVE BRAINLIEST AND 30 POINTS! NEED ASAP!
All lightbulbs emit some heat. The heat emitted is measured in Btu, a unit of energy. This value is given for each type of lightbulb.

Incandescent: 85 Btu/h

CFL: 30 Btu/h

LED: 3.4 Btu/h

Which lightbulb do you think is the most energy-efficient? Why?

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?

Who was the first scientist to measure speed as distance over time?

Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. when the carts collide, they hook together. assume that positive momentum is to the right. which graph best represents the momentum of both carts over time, before and after the collision?