200mg of uranium-238 has a half life of 4.5 billion years

How much will be left after 13.5 billion years

What are 5 differences between Spring Tides and Neap Tides?

Which condition describes an object having terminal velocity? a. gravity > air resistance b. gravity < air resistance c. gravity = air resistance

A block of wood weighing 25 N is subrnerged under water. If the net force on the wood is 5 N upward, how much buoyant force is acting on the wood? A) 30 N upward B) 20 N upward C) 5 N upward D) 25 N downward

In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is (amperes), the resistance is ohms. What is the resistance when the current is?

An educated guess is based on past experience. How does a hypothesis express the educated guess? A. The educated guess is not part of the hypothesis. B. The educated guess is a conclusion of the hypothesis. C.

The national grid supplied a house with 18000000 J of energy in 1 hour. What was the average current supplied to the house in that hour? Write any equations that you use.

Claudia throws a baseball to her dog. Which free-body diagram shows the baseball when it's flying horizontally in midair? (Assume no air resistance.)

Which of the following substances will show the smallest change in temperature when equal amounts of energy are absorbed? water air sand concrete

The downward acceleration of a falling body on Earth is 9.81m/s2. On the moon the same quantity is 1.62m/s2. An astronaut in a space suit has a mass of 145kg.

Explain how a guitar produces sound by using the terms standing waves and resonance.