A wave x meters long has a speed of y meters per second. The frequency of the wave is, a) x/y hertz b) y/x hertz c) Y times X hertz d) y+x hertz

A ball (mass 0.40 kg) is initially moving to the left at 30 m/s. After hitting the wall, the ball is moving to the right at 20 m/s. What is the impulse of the net force on the ball during its collision with the wall? A) 20 kg.

Which gas in the atmosphere protects living things from ultraviolet light? A. Carbon dioxide B. Water vapor C. Ozone D. Oxygen

Which job is best for a person who wants to provide hands-on care after spending a year in training? A registered nurse an on-call doctor a surgeon licensed practical nurse

What to do with a brand new mobile phone battery

A 750 Watt hairdryer is used for 15 minutes. Calculate the Kwhr used.

Two electrons are 2.3nm apart. What is the force between two electrons?

3. In a demonstration learning activity, A. the teacher shows children how something works or how to complete an entire activity. B. each child shows and tells about a favorite toy. C.

A 0.12 kg paper airplane flies in a straight line at a speed of 1.3 m/s. How much kinetic energy does the airplane have?

Each atom is composed of electrons and positive material. The mass of the atom is evenly spread throughout the atom. Neutrons are located in the center of the atom. Positive charge occupies a very small volume in the atom.

A hot-air balloon is ascending at the rate of 14 m/s and is 84 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?