How much heat energy (in megajoules) is needed to convert 7 kilograms of ice at - 9 degrees Celsius to water at 0 degrees Celsius?

A) 3.09 MJ

B) 2.13 MJ

C) 2.48 MJ

D) 3.26 MJ

Electrical current is defined as The capacity to store charge The flow of electrical charge per unit time The amount of stored electrical energy The voltage of the battery

5. Air enters a turbine operating at steady state at 8 bar, 1400 K and expands to 0.8 bar. The turbine is well insulated, and kinetic and potential energy effects can be neglected.

If velocity is positive, which woul vost likely yield a negative acceleration? A final velocity that is faster than an initial velocity. A time that is less than a half hour. An initial velocity that is faster than a final velocity.

While trying out for the position of pitcher on your high school baseball team, you throw a fastball at 87.6 mi/h toward home plate, which is 18.4 m away.

Which of these substances is a compound? a.) chlorine b.) nitrogen c.) uranium d.) ammonia

Two objects experience a 12 N electrical force between them. What force will the objects experience if the distance between them is doubled?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?

Which of the following is not the name of a space station that was in orbit around Earth?

Relationship between acceleration and free fall