Telescopes work by using optics which means light true or false

I don't know what category to put this in so forgive me if it's not the right one

Motion combines the concepts of position change (length) and time. Which of the following combination of units is used to describe the velocity of a moving object? length x time length/time Length/time^2 time/length

Evaluate: (5x + 4y) / 2, which is an expression of a certain experimental procedure. lf x represents the valence of Argon and y represents the summation or valencies of sulphur and Neon

A child walks 35 meters in 7 seconds. calculate the child's speed.

A collision in which kinetic energy is transferred only as kinetic energy from one object to another and is not converted in any other amount to any other form of energy A static friction. B kinetic energy C elastic collision D bouyant force

How far does a car go in 10 seconds at the speed of 44m/s

Which of the following subatomic particles does not have a charge? A.) electron B.) proton C.) neutron D.) positron

How do we use light in space?

What units are used for gravitational potential energy? Write the name, not the symbol.

A 7.5 kg block is placed on a table. If it's bottom surface area is 0.6m2, how much pressure does the block exert on the tabletop? A. 376.5 Pa B. 73.5 Pa C. 226.5 Pa D. 122.5 Pa

A boulder of mass 2000 kg is at the top of a cliff of height 220 m. Determine how fast the boulder will be moving when it strikes the dirt below.