What are two types of electric currents?

find a magnitude of the force such that if the act at right angle there resultant is √10N but if the act of 50° the resultant is √13N

A mixture consists of saw dust, salt, and pebbles. Which of the following instruments or materials would not be useful in separating this mixture? magnet filter paper screen water

Facts about river deltas

A wave has a wavelength of 5 mm and a frequency of 17 hertz. What is its speed?

Which definition is correct and uses only quantities rather than units? A. Density is mass per unit volume B. potential difference is energy per unit current C. Pressure is force per unit area D. speed is distance travelled per second

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?