A mineral sample has a mass of 4.2 grams and a volume of 2 milliliters. What is the density of the mineral

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Answer 1

Answer: what value does the 4 represent in the number 487.009

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Opposite electric charges will repel, and like charges will attract.

An insect is able to walk across the surface of a pond without sinking because of the A. polarity of the water molecules.
B. process of evaporation.
C. surface tension of the water.
D. adhesion of the insect's feet to the surface of the water.

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C. surface tension of the water.

the answer to that will be D because it has nothing at all to do with the water because either way the water shall stay the same if the animal or insect could or could not be able to walk on water.

What units are used to measure mass and weight?

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grams, kilograms, pounds for mass

newtons for weight

Humidity can be measured using human _____.

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can be measured by using humans hair

It says on a website that humidity can be measured by human hair.

Which phase of matter has a fixed volume, but variable shape?

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Solids don't change their shape, and gases have no fixed volume. So the answer must be the LIQUID phase.

The phase of matter that has a fixed volume and variable shape would be solids.

Air, liquid, and gas all have variable shapes. Air can be compressed and put inside of can, so the shape of it changes. Liquid can be poured and can take the shape of whatever type of container it is in. Gas is the same way and it can take any shape.

Which of these is not a resistor?a. wire
b. light bulb
c. hair dryer
d. all of these are resistors

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The correct answer is (d.) all of these are resistors. A resistor creates the reduction of the current flow and voltage levels within the circuits. A wire is a resistor because it is made up of alloy and carbon that helps to maintain a low resistance and have an easy flow of the electric charges. Same as the light bulb and the hair dryer, they all reduce the current flow.

Which statement is true about the energy of electromagnetic radiation? A.the frequency of the emmited radiation is inversely proportional to its energy. B.the frequency of the emitted radiation is directly proportional to its energy C.the wavelength of the emitted radiation is directly proportional to its energy. D.the amplitude of the emitted radiation is inversely proportional to its energy.

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The frequency of the emitted radiation is directly proportional to its energy

Answer: Option (B) is the correct answer.

Explanation:

The radiation in which waves of electromagnetic field travel or propagate through the space and carries electromagnetic radient energy is known as electromagnetic radiation.

The relation between energy and frequency is as follows.

$E = h \nu$ ............ (1)