A standing wave is the result of:

refraction

diffraction

reflection

resonance

Which item is an example of a lever? 1. scissors 2. a screw hammered in the wall 3. a flagpole 4. the slope of a hill 5. a knife

A light wave travels through air in equals 1.00 at an angle of 35 degrees what angle does it have when it passes from the air into the glass n equals 1.50

What is the potential energy of a one kilogram box of chocolates hidden on a shelf in the pantry 2 meters above the floor? a) 96.1 J b) 2 J c) 19.6 d) 9.8 J

21. Which of the equations is balanced? A) 2Li2O + H2O ⇒ 2LiOH B) 3Fe + 3O2 ⇒ 2Fe2O3 C) 2N2 + O2 ⇒ 3N2O D) 3Mg + N2 ⇒ Mg3N2

1. How do populations of invasive species continue to grow, and disrupt ecosystems? 2. What are natural factors that can cause the introduction of invasive species?

You rub a clear plastic pen with wool, and observe that a strip of invisible tape is attacted to the pen. Assuming that the pen has a negative charge, which of the following could be true? Select all that apply.: A.

Magnet a has twice the magnetic field strength of magnet b and at a certain distance pulls on magnet b with a force of 100 n. the amount of force that magnet a exerts on magnet b is

A heavy sled and a light sled, both moving horizontally with the same speed, suddenly slide onto a rough patch of snow and eventually come to a stop.

How does the force of attraction change? A) The force becomes twice as much. B) The force becomes one-half as much. C) The force becomes four times as much. D) The force becomes one-quarter as much.

How does the rotation speed vary as you move outward for a person sitting on a playground merry go round? How about the force here, how does this change?