8. Which element will form a 2-ion?

sulfur

Calcium

potassium

helium

What is three sources of light

Which phrase best describes the time period in which the current body of scientific knowledge was developed? A. Just over the last 50 years B. Throughout all of history C. Mostly in the 20th century D. Mostly during Roman times

What do waves carry through objects?

During a space shuttle launch about 830,000 kg of fuel is burned in 8 min. the fuel provides the shuttle with a constant thrust, or forward force.

Two charges, - q0 and - 4q0 are a distance l apart. these two charges are free to move but do not because there is a third charge nearby.

If you are trying to balance a seesaw and you have a higher mass on the left, should the mass on the right be placed at a greater distance or lower distance to balance it? Why?

A car travels 300 km in the first 3 hours of a trip. Then it hits traffic and travels only 60 km during the last hour. What is the average speed of the car? a.) 180 km/h b.) 100 km/h c.) 90 km/h d.) 120 km/h

What is the purpose of using a wedge? A. separates objects B. keeps objects together C. allows you to exert force over a distance

Echolocation is an acoustic principle in which some wildlife use resonance to find food at night. Question 25 options: True False

Use the drop-down menus to identify the variables for the second hypothesis. Hypothesis #2: As you build circuits, you will alter resistance, which is the y variable.