How was helium first discovered?

mining of the radioactive element uranium

using spectral analysis of the Suns' emission spectra

o hubble obtaining samples from explosions off the surface of the sun

deep sea mining off the coast of Texas

Water is being split to form two new substances hydrogen and oxygen is this a change of state?

What will happen if an electron is added to an atom

What is the atomic mass number (A) for the Nobelium that results from the decay of the Volunterium?

A ball is moving at 7.0 m/s and has a momentum of 100 kg•m/s. What is the ball's mass?

When resistors 1 and 2 are connected in series, the equivalent resistance is 14.9 ω. when they are connected in parallel, the equivalent resistance is 2.69 ω. what are (a) the smaller resistance and (b) the larger resistance of these two resistors?

If a pressure gauge measure an increase in 3*10^ (5) Pa on an area of 0.7 m^2, calculate the increase in the force applied to the area?

Which of the following is an example of potential rather than kinetic energy? a. water rushing over Niagara Falls b. a molecule of glucose c. a crawling beetle foraging for food d. light flashes emitted by a firefly

If a force of 15 newtons [N] is applied to a surface and the pressure is measured as 4,000 pascals [Pa], what is the area of the surface in units of square milimeters [mm2 ]?

An engineer has the task of producing an aluminum alloy with a density of 3.0 grams per cubic centimeter. She comes up with the perfect alloy and saves a sample of it. Which mass and volume measurements correspond to this sample? 7 g and 2.

What must be your car's average speed in order to travel 235km in 3.25 hours?