If a hydrogen atom has its electron in the n = 4 state, how much energy in eV is needed to ionize it?

Using the drop-down menus, choose the right government service to complete each sentence. Providing a free public education for all children is an example of supporting. Fighting fires is one way in which the government ensuresfor citizens.

A tennis ball travels the length of the court in 24 m in. 5 seconds find its average speed

Why is it that, in a spoon, you can see yourself upside down? Bamboozled me for years.

Sedimentary rock can contain evidence of life because of all following are properties of sedimentary rock except?

The fastest plane ever made, the Lockheed SR71, was able to travel 2200 miles per hour. Based on this speed, how far can it travel in 2 hours, 3 hours, and 5 hours?

Block B has mass 4.00 kg and sits at rest on a horizontal, frictionless surface. Block A has mass 2.00 kg and sits at rest on top of block B. The coefficient of static friction between the two blocks is 0.400.

T=2π√ (l/g) is dimensionally correct

A penny falls from a windowsill which is 25.0 m above the sidewalk. How much time does a passerby on the sidewalk below have to move out of the way before the penny hits the ground?

Show that the Newton has the units of mass times acceleration.

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s