What communication device allows us to communicate with very distant places via telephone?

When you drive a car in a circle at a constant speed you are accelerating towards the center of your circular motion.

The specific heat capacity of solid copper metal is 0.385 J/gK. How many joules of heat are needed to raise the temperature of a 1.55-kg block of copper from 33.0°C to 77.5°C? The specific heat capacity of solid copper metal is 0.385 J/gK.

A wave has a wavelength of 11 mm and a frequency of 11 hertz. What is its speed?

If a marble is released from a height of 1955 cm, how long would it take to hit the ground?

What is a qualitative forecasting​ method?

With the switch closed, how does the voltage across the 20-ω resistor compare to the voltage across the 10-ω resistor?

A 5.90-g lead bullet traveling at 410 m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half is transmitted to the tree, what is the increase in

How do you scientists determine the number of neutrons in an isotope of an atom?

Why is energy efficiency important to society's need to be efficient with energy usage?

A wave has a wavelength of 9 mm and a frequency of 14 hertz. What is its speed?