a toy plane weighs 500g. when placed in water, it changes the water level from 250ml to 300ml. what is the density?

Light can be transmitted through long fiber optic strands because of a. refraction. b. external diffraction. c. total internal reflection. d. interference

Why do regular sugar mints dissolve faster in liquids than sugar free mints?

What happens when carbon dioxide at 74°C is placed in thermal contact with water at 14°C? Energy leaves the carbon dioxide and enters the water. The water gets hotter than the carbon dioxide. The temperatures of the two substances equalize.

Special substances in cells that absorb or release hydrogen ions to keep the ph value constant are called

Why is it hard to prove the law when a gas is produced?

A small 15 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?

Liquid water is heated until it boils and becomes water gas. Which statement is true about the water?

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?