Which of the following is not a device/way that uses sound?

Ultrasound

Doppler

Electrocardiogram

Decibels

All choices use sound

A wave has a wavelength of 10 mm and a frequency of 5 hertz. what is its speed?

A railway truck of mass 800 kg moving with a constant velocity of 5 m/s, collides and couples with another railway truck of mass 6+50 kg which is stationary.

Many extrusive volcanic rocks contain holes which have formed from: acidic reactions escaping gases quartz crystals underwater eruptions

On average, the Moon is three hundred and eighty thousand km (kilometers) from the Earth. How is this quantity expressed as a number?

Which of the following would not make a good insulator * rubber *plastic *wood *metal

If element X has 17 protons, how many electrons does it have?

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.

A boat floats with 25% of its volume under water. a. What is the boatâs density? b. If the boat was made from 500 kg of metal, what is the volume of the boat? (Assume the air in the boat has negligible mass and density) c.

Why does each mineral have their own property, different from every other mineral?

Earth's tallest mountain ranges are found at plate boundaries