Which criterion did this sleep cycle alarm clock fail to meet?
-It did not solve the problem.
-It was not cost effective enough.
-It was not readily available.
-It was not safe for most users.

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

Suppose that a cylindrical tank 6 meters high with a radius of 2 meters is filled to the rim with water. the tank is buried so that the top of the tank is 1 meter below ground level. the space above the tank is not filled with water. calculate how much work needs to be done by a pump to pump the water out of the tank up to ground level. (the water weighs 9,800 newtons per cubic meter.)

The energy of a photon is equal to (what) times (what) of the photon.