How do you increase friction intentionally?

Two cars approach each other; both cars are moving westward, one at 85 km/h, the other at 54 km/h. what is the magnitude of the velocity of the first car relative to (in the frame of reference of) the second car? answer in units of km/h.

How to make the air lighter?

A bicyclist travels 30 km in 2 hours, what is their average speed?

is the speed of a radio wave in the air, less than, greater than, or the same, to the speed of a sound wave in the air

A 120-V power supply connected to a 30-ohm resistor will produce amps of current

A planet is discovered orbiting around a star in the galaxy Andromeda at four times the distance from the star as Earth is from the Sun.

Measurements of how orbital speeds depend on distance from the center of our galaxy tell us that stars in the outskirts of the galaxy. True or False

Identify what is required to calculate the atomic number and atomic mass of an element

What device is used to measure the current in a circuit

A lever allows a 35 N load to be lifted with a force of 7 N. What is the mechanical advantage of the lever?