PHYSICS MIDDLE SCHOOL

If a wave has amplitude of 2 meters, a wavelength of 2 meters, and a frequency of 10 Hz, and a period of 1 second, then at what speed is the wave moving?

Answers

Answer 1

Answer:

Answer:

20 m/s

Explanation:

The speed of a wave is given by:

$v=\lambda f$

where

$\lambda$ is the wavelength

f is the frequency

v is the speed

For the wave in this problem,

f = 10 Hz is the frequency

$\lambda=2 m$ is the wavelength

So the speed is

$v=(10 Hz)(2 m)=20 m/s$

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Jenny got a balloon at a party. When she squeezes the balloon, she can squish the air inside it and change the shape of the balloon. Which of the following is/are true about the change that happens when Jenny squishes the balloon? I. It is a physical change. II. It makes a new substance. III. It is a chemical change.

Answers

the answer is l only

it is a physical change because you are not changing it chemicaly

HELP FAST CORRECT ANSWERS ONLY 20PTSSelect the correct locations on the image.

Where would you expect a hot main-sequence star with high luminosity to be located on the following HR diagram?

Answers

Answer: Between -5 and 0

Explanation:

Answer:

between 0 and -5

Explanation:

Plato/Edmentum

Help Please!!!(a) What is the force of gravity between two 1170 kg cars separated by a distance of 28 m on an interstate highway?
___________ N

Answers

Force is the product of mass and acceleration. The Force between the two-car is 1.1646 x 10⁻⁷ N.

What is force?

Force can be defined as an influence that can change the motion of an object. It can be given by the formula,

F = m x a

Given to us

Masses of the car, m = 1170 kg

Distance between the car, d = 28 m

We know that according to the force of gravity,

$F = G(m_1m_2)/(d^2)$

G = gravitational constant (6.67 × 10⁻¹¹ N·m²/kg²),

m₁ = mass of object 1

m₂ = the mass of object 2

d = distance between two objects

Substitute the values,

$F = (6.67 * 10^(-11))(1170 * 1170)/(28^2)\n\nF = 1.1646 * 10^(-7)\ N$

Hence, the Force between the two-car is 1.1646 x 10⁻⁷ N.

Learn more about Force:

brainly.com/question/26115859

Answer:

$1.16\cdot 10^(-7) N$

Explanation:

The force of gravity between two objects is given by:

$F=G(m_1 m_2)/(r^2)$

where

G is the gravitational constant

m1, m2 are the masses of the two objects

r is their separation

In this problem, we have

m1 = m2 = 1170 kg is the mass of each car

r = 28 m is their separation

Substituting,

$F=(6.67\cdot 10^(-11) )((1170 kg)^2)/((28 m)^2)=1.16\cdot 10^(-7) N$

A newspaper turns yellow in sunlight. Is this a physical or chemical change?

Answers

It is a chemical change. I always think of a chemical/physical change as if you could reverse it back as it started off, for example if you stepped on a can you can reverse the can back probably not exactly like it was before but you can still reverse it so this would be a physical change, and if you baked a pizza you could not reverse the dough and everything else back.

Heat energy flowing up the handle of a spoon placed in boiling water is an example of which type of heat transfer.

Answers

conduction I believe

Conduction, which is the transfer of heat energy through objects touching.

What are three methods of heat transfer and what are some examples

Answers

Answer: I am studying heat transfer and have learned there are three kinds of heat transfer: conduction, convection, and radiation. Some examples are:

Conduction:

Touching a stove and being burned

Ice cooling down your hand

Boiling water by thrusting a red-hot piece of iron into it

Convection:

Hot air rising, cooling, and falling (convection currents)

An old-fashioned radiator (creates a convection cell in a room by emitting warm air at the top and drawing in cool air at the bottom).

Radiation:

Heat from the sun warming your face

Heat from a lightbulb

Heat from a fire

Heat from anything else which is warmer than its surroundings.

Explanation: A good example would be heating a tin can of water using a Bunsen burner. Initially the flame produces radiation which heats the tin can. The tin can then transfers heat to the water through conduction. The hot water then rises to the top, in the convection process.

The atmosphere would be another example. The atmosphere is heated by radiation from the Sun, the atmosphere exhibits convection as hot air near the equator rises producing winds, and finally there is conduction between air molecules, and small amounts of air-land conduction.

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Ionic compounds molecules have strong forces of attraction between neighboring molecules. Which conclusion could be drawn about materials held together by ionic bonds? A) These materials would have low densities as solids. Eliminate B) These materials would have very high boiling points. C) These materials will likely be gases at room temperature. D) These materials will likely be liquids at room temperature.