An electric current that changes directions at regular intervals is called

a. directional current.

c. reversible current.

b. alternating current.

d. fluctuating current.

A highway curves to the left with radius of curvature of 36 m and is banked at 28 ◦ so that cars can take this curve at higher speeds. Consider a car of mass 1717 kg whose tires have a static friction coefficient 0.87 against the pavement.

In a nuclear power station which step of the process converts energy of other forms into electrical energy that can be used as electricity? A) Fission reactions occur in the reactor core, generating heat.

10. Which one of the following accurately describes the force of gravity? A. The gravity acceleration is in the same direction as the force of gravity, and thus toward the center of the earth. B.

If Star A is twice as far as Star B, and they are identical in all other ways, then the brightness of Star A would be

Which describes what happens when fuel is ignited in a heat engine? A. Chemical energy is converted into thermal energy B. Thermal energy is converted into solar energy. C. Solar energy is converted into chemical energy D.

a subsrance has an atomic number of 80. How many protons and electrons do atoms of the substance have? what is the subsance?

Ideal meters problem. What internal resistance is ideal for a voltmeter? What internal resistance is ideal for an ammeter?

numerical question : what is the required heat to raise the temperature of 2 kg parrafin by 10 Celsius if 44000 joules is required to raise it by 200 celsius

Psychologists avoid studying emotions because they have little impact on behavior T F

Sheila lives in the seashore community of Beachview. At 6:00 a. m. one morning, she noticed that the local ocean water was at high tide. At approximately noon that same day, she noticed the water was at low tide.