Stars go through a life cycle. About 90% of all stars are in the main sequence period of the life cycle. Stars are stable during the main sequence period of the life cycle. Why?

A 12 Volt lead-acid car battery, engineered for "up to 500 or more charge/discharge cycles," has a rating of 95.0 Ampere-hours. It sells for $ 126.00.

Sound waves are a - Transverse b - Longitudinal c - Transverse and longitudinal

A two-dimensional section of the body is known as an

Marissa drags a 23 kg duffel bag 18 m across the gym floor. if the coefficient of kinetic friction between the floor and bag is 0.15, how much thermal energy does marissa create?

What two elements are named after Dimitri Mendeleev?

As an astronaut travels towards Earth, her weight A. decreases because gravity decreases. B. decreases because her mass decreases. C. increases because gravity increases. D. remains the same because her mass remains the same.

Lightning often strikes water. a. True b. False

How much work must be done on a 10 kg snowboard to increase its speed from 4 m/s to 6 m/s?

If a spacecraft that seems to be motionless in deep space is given some type of quick push, what will happen? A. The spacecraft will not move because it only works on earth. B.

A fast, white water cascade is also known as what?