Some earthquake waves, a cat's purr, and elephant communications consist of ultrasonic waves.

True

False

Let's say you have two tuning forks which are supposed to produce the same frequency, 512 Hz. One is of good quality, but the other is cheaply made and vibrates at 510 Hz. If you bonk them both how many beats per second will you hear

A climber pulls down on a rope causing his body to lift upward and rise up along the rope. Would that be considered 1st, 2nd or 3rd of Newton's law?

If a 340 N girl sits on a seesaw and is lifted 1.4 m in 1.6 s, how much work was done by the child on the other side?

You use sunglasses to reduce the glare of the sun when you go outside. You are taking advantages of light's ability to do which of the following? Possible Answers: to reflect to refract to diffract to polarize

A bag of apples has a weight of 22 newtons. find its approximate mass in kilograms.

What is the frequency of a wave with a velocity of 21.2 m/s and a wavelength of 8.3m?

Positive ions have blank protons than electrons

What is the weight, in n, of an object with a mass of 200 kg at a location where g = 9.6 m/s2. round the final answer to the nearest whole number?

A 1.7 kg book is lying on a 0.77 m - high table. You pick it up and place it on a bookshelf 2.0 m above the floor. how much work does gravity do on the book?

What is the difference between diffusion and osmosis?