How many pounds are in one libra

How are light and sound waves affected by the different media they travel though?

A 3.00 watt electric motor is plugged into an electrical outlet It takes the motor 30 00 seconds to lift a mass of 254.9 g a distance of 10.00 cm. In that time, the motor has used 90.

What is pressure? force per unit area gravity per unit area weight of the atmosphere force per volume

When a sound wave moves through a medium such as air, the motion of the molecules of the medium is in what direction (with respect to the motion of the sound wave?

Why does a siren have a lower pitch as it moves away from you? A The period of the sound wave is decreased B The amplitude of the sound wave is increased C The crests of the sound wave are farther apart D The troughs of the sound wave are spaced

Who wrote the mayflower compact?

In the formula for specific heat, which quantity is measured in units of J/g•°C? a - c b - Q c - T d - m

The acceleration of an object is proportional to which of the following? the mass the energy of the object the inverse of the mass the inverse of the force applied

Suppose you squeeze a sponge into a small ball. does the mass of the sponge change? Does it's density change?

A solid round bar with diameter of 2-in has a groove cut to a diameter of 1.8-in, with a groove radius of 0.1-in. the bar is not rotating.