half life worksheet answer key 3. What percent of a sample As-81 remains un-decayed after 43.2 seconds

Balances are used to measure what a. Mass of an object b. Volume c. Force acting upon it d. Level surfaces on the table

How do you solve this If y=10^; then x=

Observer A, who is at rest in the laboratory, is studying a particle that is moving through the laboratory at a speed of v=0.8c and determines its lifetime to be τA=129 ns.

3. Is seawater an element, compound, or mixture? Explain your answer. 4. Explain the relationship between an atom and a molecule.

Two lightbulbs are each connected to a voltage of 120 v. one has a power of 25 w, the other 100 w. which bulb has the higher resistance?

A student in her physics lab measures the standing-wave modes of a tube. The lowest frequency that makes a resonance is 20 Hz. As the frequency is increased, the next resonance is at 60 Hz. What will be the next resonance after this? A. 80 Hz B.

For a satellite to stay in orbit around Earth, it has to be moving forward very fast all the time. What force will make it fall to Earth if it goes too slowly?

A student hangs a balloon from a string then rubs it on their hair and releases it. They rub a second balloon on their hair then move it towards the hanging balloon the moving balloon moves away because ...

Plato and the Soul. A. Plato believed that our souls died with our physical bodies. B. Plato believes our souls were the shadows on the cave walls. C. Plato believed our souls did not exist.

A 1000 kg satellite and a 2000 kg satellite follow exactly the same orbit around the earth. What is the ratio F1/F2 of the gravitational force on the first satellite to that on the second satellite?