The sound wave has a frequency of 435Hz. What is its period?

A small car traveling with 5,000 kgm/s hits a light truck that was at rest at a red light. After the collision the small car bounces backwards with a momentum of 3,000 kgm/s. What would the momentum of the truck be after the collision?

According to the principle of reflection, when an incident light wave strikes a reflective surface at an angle of 30 degrees, at what angle will it reflect off the surface?

What best describes the advantage of using the model of a food web? A. Shows feeding connections B. Explains every detail of wildlife C. Shows a complex mental model D. Represents data collected from space

An airplane starts at rest and accelerates down a runaway for 20s. At the end of the runway, its velocity is 80m/s north. What is its acceleration?

Water has a very high specific heat capacity when compared to most other common materials. In fact, ethyl alcohol has a specific heat that is only about that of water, whereas the specific heat of lead is about that of water.

What is energy? (Not the answer from google search.)

Explain why the friction force between two surfaces increases if the force is pushing the surfaces together increases.

As energy moves in waves through the water, the water moves a. in waves toward shore. c. in the direction of the waves. b. in a small circular movement. d. against the current.

Which of the following values represents an index of refraction of an actual material? A. 0 B. 1 / 4 C. 5 / 4 D. 1 / 2

Which statement best describes the effect of scientific advances on society? A. They always have a positive impact on society. B. They are inspired by the needs of society. C. they do not affect society beyond the community level. D.