The head of a state government in the United States is referred to as which of the selections below?

A roller coaster train with a mass of 500 kg stops at the top of a hill. If the hill is 110 m high, what is the potential energy of the train?

Exposure to the Sun's harmful infrared radiation should be kept to a minimum. a. True b. False

Which statements belong to Dalton's atomic theory? Select all that apply. Atoms have a massive, positively charged center. Atoms cannot be created or destroyed. Atoms cannot be broken down into smaller pieces. All atoms of an element are identical.

A 10 cm long tensile specimen with a yield stress of 350 MPa is pull to a stress of 300 MPa and then the load is released. What is the length of the specimen after the load is released?

What is required for a rocket to lift off into space? a. thrust that is greater than Earth's gravity b. mass that is greater than Earth's c. very little air resistance d. more velocity than friction

A car is moving 14.4 m/s when it hits the brakes. It slow from 78.8 m, which take 9.92s. It then accelerates at 1.83 m/s 2 for 4.50 s. What is the total displacement?

Select all of the answers that apply. What conditions on Earth are unique from other planets in our solar system?

Which is a chemical change

A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is?

What is the electrical power when the current is 25 amps and the voltage is 10 volts?