A sample contains 36g of a radioactive isotope. how much radioactive isotope remains in the sample after 3 half-lives

As an object falls toward earth, the potential energy of the object ... A. Increases B. Decreases C. Stays the same

You throw a rock upwards; it rises and then falls back down. We know that the acceleration due to gravity is 9.8 m/sec2 near the surface of earth.

Match the object with its characteristic.

What is the unit and tool to measure the mass of a rock?

Which statement is true regarding studies of the empty nest syndrome? A. The syndrome affects only the primary caregiver. B. There are no positive aspects to the empty nest syndrome. C.

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)

Your boss at the Cut-Rate Cuckoo Clock Company wants to save money on materials. You are asked to reduce the balance wheel, which is cylindrical, dimensions to one-third their original values.

Which of the following conditions is not necessary to observe an interference pattern between two sets of waves? A) The waves must have the same wavelength. B) The waves must have a constant phase difference.