How long have humans been migrating?

А

2,000 years

about 200,000 years

about 60,000 years

D

1,000 years

You push a 5-kg box across the floor with a force of 25N. How far do you have to push the box to do 63J of work?

The Sun emits a lot of radiation. The different types of radiation are the electromagnetic spectrum. Which of the following wave types are part of the spectrum?

A 1200 kg vehicle initially travelling at 50. km/h experiences an air resistance of 5000 N and road friction of 2200 N. The wheels deliver a force of 7500 N to the vehicle. What is its acceleration?

Blue light has a higher frequency than X-rays. (A) True (B) False

A building that is 105.50 ft. feet tall is casting a shadow that is 37.50 ft. feet. If the building next to it, is casting a shadow of 41.00 ft. feet, how tall is that building?

A wave is a (blank) that carries (blank) from one place to another

The movement of thermal energy from hot to cold materials is called

A jar contains 30 ml of glycerin and 60 ml of corn syrup which liquid is on the top layer

What are optical fibres

Where in the body does neutral, acidic and basic (alkaline) solutions usually exist?