What is the half life of each of these radioactive isotopes?

a radioactive isotope decreased to one-fourth its original amount in 18 months.

Renewable energy energy is an important alternate source of energy. Why?

A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt.

When an object is totally immersed in water, it's weight is recorded as 3.1N if it's weight in air is 4.9N calculate the upthrust acting on this object

The opening of the stomata allows water to evaporate from inside the leaf in a process known as transpiration.

If you put a straw into a glass of water, the straw looks to be bent, although nothing has really happened to the straw. The term that describes this property of light is A) absorption. B) diffraction. C) reflection. D) refraction

What investigations provide large amounts of information about a wide range of variables.

Why would Sodium (Na) and Chlorine (CI) want to form a lonic Bond? -to achieve a full inner valence shell -to achieve a equal amount of protons & electrons in their nucleus -to achieve an stable amount of protons & neutrons in their nucleus -to

A digital thermometer reads 15 degrees Celsius, what is the uncertainty?

Determine the magnitude of the effective value of g⃗ at a latitude of 60 ∘ on the earth. assume the earth is a rotating sphere.

What characteristic of a planet determines the acceleration due to gravity on it?