How long have simple machines been around?

Group of answer choices

A: thousands of years

B: 850 years

c: millions of years

d: hundreds of years

If you are using your highbeams at night you should remember to do what?

Consider a refrigerator that consumes 320 W of electric power when it is running. If the refrigerator runs only one quarter of the time and the unit cost of electricity is $0.09/kWh, the electricity cost of this refrigerator per month (30 days) is A.

Which is an obsolete technology steam engine gasoline engine jet engine diesel engine

It is a common trick to fill a straw with water, put your finger on the top of straw, and then watch as the water is suspended within the straw.

Gear A has 30 teeth & Gear B has 20 teeth. If Gear A rotates at 1000rpm, what speed does Gear B rotate at?

Roentgens are used to measure the amount of: uranium fuel burned radiation hydrogen isotopes

What is the maximum % carbon for structural steel?

An airplane flies from San Francisco to Washington DC at an air speed of 800 km/hr. Assume Washington is due east of San Francisco at a distance of 6000 km.

An example of Ferrous alloy is Brass a) - True b) - False

There is no difference in boring and drilling. a) - True b) - False