What is the frequency of a wave that has a wavelength of 20 cm and a speed of 10 m/s?50 Hz

200 Hz

0.5 Hz

10 Hz

Answers

Answer 1
Answer: Frequency = velocity/wavelength

Frequency = 10/20

Frequency = 0.5 Hz

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Click to select the correct answers. Click again to unselect answers. Leave the incorrect answers unselected.What do you know about the law of conservation of energy? Check all the statements that are true according to this law.

The total amount of mass in a system remains constant regardless of the changes that take place in that system.
Energy is neither created or destroyed; it only changes form.
Half-way down the ramp, PE = 50J and KE = 50J.
In this energy pyramid, all the energy from level is transferred to the next level.
In a closed system, i.e., a system that isolated from its surroundings, the total energy of the system is conserved.

Answers

All the statements regarding law of conservation of energy are true except for statement 2 stating energy changes half way down the ramp.

What is law of conservation of energy?

According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.Energy of an isolated and closed system remains constant.

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Answer:energy

Halfway

In a closed system..3

Explanation:

A rectangular glass block of dimensions 8.0 cm by 15.0 cm by 3.0 cm weighs 10.5 N. Calculate the minimum and the maximum pressure the bock can exert when it rests on a horizontal table.---
Please answer this asap!

Answers

The pressure can be solved using the following formula:

P = mg / A

Where: P = pressure
mg = mass * gravity = W = 10.5 N
A = l*w

Solving for A (maximum):

A = 8*3
A = 24 sq. cm

Solving for A (minimum):

A = 15*8
A = 120 sq. cm

Substituting into the first equation:

Pmax = 10.5 N / 24 sq.cm
Pmax = 0.4375 Pa

Pmin = 10.5 N / 120 sq.cm
Pmin = 0.0875 Pa

HELP PLEASE Example: Convert 25°C to °F.

Formula: °F = (9/5) (°C) + 32  °C is given so I am solving for °F.
°F = (9/5) (25) + 32
=(1.8*25)+ 32
=45+32
=77
Answer= 77°F is equal to 25°C


A. Convert 35°C to °F




B. Convert 80°F to °C




C. Convert 15°C to °F




D. Convert 25°F to °C

Answers

Angel !  You have a formula, and you have an example that's
completely worked out.  The ONLY POSSIBLE reason that you
could still need help is that you're letting math scare you.

I'll do 'A' for you, 'B' most of the way, and get 'C' set up.
If THAT's not enough for you to run with and finish them all,
then you and I should both be embarrassed.

Write the formula on the wall:

                                   °F  =  (9/5) °C  +  32°

A).  Convert 35° C        °F  =  (9/5)(35°) + 32°

(9/5)(35) = 63              °F  =      63°      + 32°

                                     °F  =  95°
____________________________________

B).  Convert 80°F to °C 
                         The formula:    °F  =  (9/5) °C  +  32°

°F = 80                                     80  =  (9/5)°C  +  32

Subtract 32 from each side:      48 = (9/5)°C

Multiply each side by  5 :        240  =  (9) C

Now you take over:
_________________________________________

C).  Convert 15°C to °F.
                         The formula:    °F  =  (9/5) °C  +  32°

°C = 15                                      °F = (9/5) 15° + 32

(9/5) (15) = 27     
                             Go !              °F  = 

What role does Nitrogen play for all living organisms?​

Answers

It is an important part of many cells and processes such as amino acids, proteins and even our DNA. It is also needed to make chlorophyll in plants, which is used in photosynthesis to make their food.

Hope this helps! ;)

An element becomes a positively charged ion when itloses protons.

loses electrons.

gains electrons.

gains neutrons.

Answers

An element becomes a positively charged ion when it losses electron.

What is electric charge?

Charged material experiences a force when it is exposed to an electromagnetic field due to the physical property of electric charge. You can have a positive ornegative electric charge (commonly carried by protons and electrons respectively). Unlike charges attract one another while like charges repel one another. Neutral refers to an object that carries no net charge.

Electric charge is a conserved attribute, meaning that the net charge—that is, the sum of the positive and negative charges in an isolated system—cannot change. Subatomic particles carry an electric charge. In the nuclei of atoms, protons have positive charge and electrons carry negative charge in normal matter.

So, an element becomes a positively charged ion when it loses negative charge, that is, electron.

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An element becomes a + ion when it...loses electrons

Wh does a soccer ball that is quickly rolling across a grass field slow and finally stops rolling

Answers

Friction which helps it stop is that what your asking
Friction cancels out the exerted force applied to the ball