Helium is used in balloons because it is

Over the last 100 years, what has happened to average global temperature? . It has risen. It has fallen. It has stayed the same. Average temperature never changes.

Complete the passage to explain how the first law of thermodynamics describes what happens to heat added to or absorbed by a system. The first law of thermodynamics describes how the heat added to a system is conserved.

Ordinary charges are usually very large and measured in coulombs

A baseball bat snaps backward after hitting a ball. Which of Newton's Law is this.

A wave has a wavelength (A) of 2.6 m. The speed (v) of that wave is 35 m/s. What is the frequency (f) of the wave

Both artists and scientists contribute to our understanding of the world around us. Identify the ways that art and science are similar. Check all that apply.

An automobile accelerates from rest at 1 + 3 * sqrt (t) mph/sec for 9 seconds. how far does it travel in those 9 sec?

A glass lens, n glass = 1.52, has a 131 nm thick antireflective film coating one side, n film = 1.25. White light, moving through the air, is perpendicularly incident on the coated side of the lens.

An automobile steering wheel is shown. The ideal mechanical advantage of this wheel and axle is. If a driver must exert a force of 2 N to overcome an axle resistance of 16 N, the AMA of the steering wheel is and its efficiency is__ %.?

How does the law of conservation of energy apply to machines? -Machines create energy from scratch. -Machines consume energy until no energy remains. -Energy transferred to a machine equals energy transferred from it.