1. A certain atom has 20 electrons, 21 neutrons, and 20 protons. What is

the atomic mass of the atom?

You are on the roller blades on top of a small hill. Your potential energy is equal to 1,000.0 joules. The last time you checked your mass was 60.0 kilograms. What is your weight in newtons?

Create a group of 3-4 students. Using your cell phone flashlight and the filter, create a "blue" flashlight, "red" flashlight, and "green" flashlight. Shine all three flashlights at the white index card. Describe what you observe.

If an element has the atomic mass (a) of 80 and its atomic number (z) is 35, how many neutrons does it have?

A certain machine changes a large input force into a smaller output force. how will the machine affect the distance over which the force is applied? explain.

A thermometer reading 7degreesC is brought into a room with a constant temperature of 30 degrees C. If the thermometer reads 16degreesC after 2 minutes, what will it read after being in the room for 4 minutes? For 9 minutes?

In what way would a digital thermometer be preferable to those from a liquid-based thermometer? Digital thermometer readings are easier to use when performing calculations.

Why does the core of the sun contain more helium and less hydrogen than the surface of the sun?

What happens to a light ray passing through the center of a lens?

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.870 m/s at an angle of 35.0° above the table, and it lands on the magazine 0.0770s after leaving the table. Ignore air resistance.

A force of 5 N accelerates an object. The object's mass is 50 g. What is the acceleration of the object? (Formula: F=ma)