An old door is very hard to open until oil is sprayed on its hinges. What does the oils do?

A) It increases the force of friction

B) It increases the force of gravity

C) It reduces the force of gravity

D) It reduces the force of friction

Describe how fossil fuels are converted into usable energy

Match the following: (Statistical methods) Frequency counts Frequency distribution Measurements of central tendency Measurements of spread A. Applied to categorical values B. Applied to quantitative values C. Mean, median, and mode D.

What is a tool that can be used to measure the size of a force

The buoyant force that is exerted by a fluid on an object that displaced a volume Vdisp is written as: Fbfo=ρfVdispg. A block of wood with a mass of 750.0 g is placed in a container of water.

The energy of an electromagnetic wave depends on its

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.