The equation to calculate density is D = m/v. For a liquid substance, which item increases as heat is applied?


Answer 1
Answer: [Almost] all liquids expand as they get warmer ... their VOLUME increases. 

Since volume is the denominator of the fraction, that means
that when the volume INcreases, the density DEcreases. 
So the liquid gets less dense when it gets warmer.

THAT means that if you have some liquid with different temperatures
in the container, the warm parts can FLOAT on top of the cold parts.
And THAT's what makes convection happen !
Answer 2




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A rolling ball has 18 joules of kinetic energy and is rolling 3 m/s find its mass


Force= mass times acceleration, so if the force is 18 and the acceleration is 3, the mass is 6. 18=(6)3.

Isotopes of the same element vary in the number of ____ present in the nucleus A.neutrons B.protons


Isotopes of the same element vary in the number of neutrons present in the nucleus. Thus, the correct option for this question is A.

What is an isotope?

An isotope may be defined as atoms with the same number of protons but different numbers of neutrons. They share almost the same chemical properties, but differ in mass and therefore in physical properties. It is a variation of an element that possesses the same atomic number but a different mass number.

According to the question, the elements of carbon-12, carbon-13, and carbon-14 are three isotopes of the element carbon that has mass numbers 12, 13, and 14 respectively.

This means that an atom has the same atomic number but a different mass number. This is better understood by the fact that the number of protons governs the atomic number.

Therefore, isotopes of the same element vary in the number of neutrons present in the nucleus. Thus, the correct option for this question is A.

To learn more about Isotopes, refer to the link:


A. Neutrons.
If it were electrons, it would be an ion.
If it were protons, it wouldn't be the same element.

At room temperature of the 92 naturally occurring elements, state the number that are: a. Solid
b. Liquid
c. Gas


At room temperature of the 92 naturally occurring elements, 11 are gases, 2 are liquids and the rest are solids. The 11 gases include: hydrogen, oxygen, chlorine, fluorine, iodine, nitrogen, xenon, neon, helium, krypton, and argon. The 2 liquids are bromine and mercury. 

A satellite of mass m is in a circular orbit of radius R2 around a spherical planet of radius R1 made of a material with density rho. ( R2 is measured from the center of the planet, not its surface.) Use G for the universal gravitational constant.


Answer: The gravitational force Fg exerted on the orbit by the planet is Fg = G 4/3πr3rhom/ (R1 + d+ R2)^2


Gravitational Force Fg = GMm/r2----1

Where G is gravitational constant

M Mass of the planet, m mass of the orbit and r is the distance between the masses.

Since the circular orbit move around the planet, it means they do not touch each other.

The distance between two points on the circumference of the two massesb is given by d, while the distance from the radius of each mass to the circumferences are R1 and R2 from the question.

Total distance r= (R1 + d + R2)^2---2

Recall, density rho =

Mass M/Volume V

Hence, mass of planet = rho × V

But volume of a sphere is 4/3πr3


Mass M of planet = rho × 4/3πr3

=4/3πr3rho in kg

From equation 1 and 2

Fg = G 4/3πr3rhom/ (R1 + d+ R2)^2


What kind of friction is shown between the skydiver and the air?


Fluid friction is the kind of friction between the skydiver and the air.


Objects moving through fluid experience fluid friction or drag. A skydiver diving in air is an example of fluid friction since air as a medium is fluid and thus air molecules resists the falling motion of a body. Weight of the object due to gravity decides the acceleration of a skydiver when in flight and the resisting frictional force (drag), opposes it.

So, a resultant force acts and his velocity increases proportionally at first and then becomes a constant terminal value. The extent of fluid friction is dependent on the size of body as well as its speed. Larger the size more is the friction; higher the speed more is the friction.


Which of the following is an obstacle to creating computer-based models for tracking a hurricane? 1. Hurricanes form over water, where it is difficult to observe them.
2. Most sources of data about hurricanes are anecdotal and unreliable.
3. Forecasters must consider a large number of variables that affect the path of the storm.
4. all of the above



4. All of the above I think, not to sure about 1. but the rest are right so im like 90.99999 percent sure good luck


Fill in the blank. ____ energy is energy stored due to the position of an object.

A. Kinetic
B. Nuclear
C. Thermal Expansion
D. Gravitational potential


D. Gravitational Potential

The Geologic Time Scale begins at the formation of Earth approximately _____ years ago.


The Geologic Time Scale begins at the formation of Earth approximately 4.5 Billion years ago.

I need help setting this problem up. Please help! A mother pushes a stroller up a hill, with the center of the stroller 1 meter ahead of her body. She maintains contact with the stroller at all times. Her position is x(t), speed is v(t) and her acceleration is a(t). What are the position, velocity, and acceleration of the stroller at any time t?


The only thing you can derive ...maybe ... from the given information is that
the stroller's x(t) is 1 + the mother's x(t).  And if her progress is not strictly
along the x-axis, then even that statement isn't true.

If the stroller's v(t) and a(t) were not identical to the mother's v(t)and a(t), then
mother and stroller would "come apart".  But you've told us that they're always
in contact, so their v(t) and a(t) must be identical.

A slightly more rigorous (and mathematical) argument is that since the mother's
and the stroller's x(t) differ (at most) only by a constant, then their derivatives
x'(t) (which is v(t)) and x''(t) (which is a(t)) are equal.

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