Which is a tool used by scientists to determine the composition of objects?

You stand on a bridge above a river and drop a rock into the water below from a height of 53 m. What is the acceleration of the rock as it falls

What does an electromagnet do? Name five (5) things.

A rigid tank having a volume of 0.100 m3 contains helium gas at 150 atm. how many balloons can be inflated by opening the valve at the top of the tank? each filled balloon is a sphere 0.300 m in diameter at an absolute pressure of 1.20 atm

Which of the following observations demonstrates the differences between speed of light and speed of sound? (Note, they are all true, but which one represents the difference in the speed?)) A.

When the same masses are heated by the same amount, which of the following substances will heat up the slowest? -aluminum ... 0.90 -iron ... 0.46 -gold ... 0.13 -copper ... 0.39

Suppose a body has a mass of 60 kilograms and a velocity of 2 meters per second upward. What is the linear momentum?

Reflection and abssorption prevent some

Why is it important to change only one experimental variable at a time in an experiment?

A 0.0663 kg ingot of metal is heated to 241◦C and then is dropped into a beaker containing 0.395 kg of water initially at 25◦C. If the final equilibrium state of the mixed system is 27.4 ◦C, find the specific heat of the metal.

What does it mean when we say an atom has decayed?