Explain why models are often used to study other planets.

We measure the loudness of sound in decibels. a. True b. False

While camping you see the reflection of the moon on the lake. it looks like a bright flat sphere on the water. what phase of the lunar cycle is the moon likely in? a. old moon b. new moon c. full moon d. waxig gibbous

Which of the following elements is a metalloid? a. copper b. helium C. phosphorus d. germanium

How much energy is required to raise the temperature of 20 kilograms of water from 0 degrees celsius to 35 degrees Celsius

Use organelle in a sentence

A weather balloon is inflated to a volume of 2.2 x 10^3 L with 374 g of helium. What is the density of helium in grams per liter?

What is the result of a mutation during replication A: the strands are different B: the strands are identical c: the strands are broken D: the strands are continuous

What is ___ heating of a liquid__ gas to liquid

A gate in an irrigation canal is constructed in the form of a trapezoid 2 m wide at the bottom, 38 m wide at the top, and 2 m high. It is placed vertically in the canal so that the water just covers the gate.

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine