How many electrons are in the third energy level of a calcium atom

What does it mean that a form of energy might take more energy to harness than it provides?

Where is most of the mass of an atom located? a. in the nucleus b. in the orbits c. in the electrons d. it is split between the nucleus and the orbits

The statement "Harvard University is a better school than the University of Chicago" is an example of a hypothesis. gossip. an opinion. a fact.

If a substance besides water is changed from a gas to a liquid and then to a solid, what happens to the particles?

Which of the following statements is true? Acquired mutations are passed down from parent to offspring. Mutations are the most fundamental way to add new genes to a gene pool. Hereditary mutations are caused by external factors, such as radiation.

What is a lenticular (S0) galaxy? A galaxy with a disk and central bulge like a spiral galaxy, but with no spiral arms A galaxy with a smooth brightness profile, lacking the central bulge and disk of a spiral galaxy A spiral galaxy with fuzzy and

Which process causes wells on land to become saline, making them unusable for drinking water? A. Erosion B. Echo sounding C. Eutrophication D. Groundwater infiltration

A farmer uses a tractor to pull a 150 kg bale of hay up a 15∘ incline to the barn at a steady 5.0 km/h. The coefficient of kinetic friction between the bale and the ramp is 0.40. Part A What is the tractor's power output?

Identify the conditions for an elastic collision in a closed system. Check all that apply. Energy is conserved. Velocities may change. Momentum is conserved. Kinetic energy is conserved. Objects stick together after the elastic collision.

When the velocity of a mass on a spring is zero, the acceleration is at