What is the result of a force distributed over an area?a. pressure
b. mass
c. temperature
d. volume

Answers

Answer 1

Answer: Pressure is the result of a force distributed over an area.

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When a physical change occurs, the mass of the substance is conserved. This means that the total mass of the substance remains the same from beginning to end. The physical properties of the substance, such as size and shape, may change, but the amount of matter in the substance does not change.
Imagine the door to a theatre is opened and you are standing outside. How is it possible that you can hear the sound of the movie or play even if you cannot see the screen or stage ?A) reflection only happens with sound waves not waves of light so the sound waves bounce out to your ears. B) the sound waves refract as they move from one medium to another C) the darkness in the theatre absorbed light but not sound so you can hear D) the sound waves diffract much more than the light waves so try bend and spread as they move through the doorway.

What is the pendulum length whose period is 2.0s ?

Answers

$Formula\ for\ period:\n\ T=2 \pi \sqrt{(L)/(g)}\n\ g-gravity=9,8 (m)/(s^2) ,\ L-pendulum \ length \n\n (T)/(2 \pi ) = \sqrt{ (L)/(g) }|square\n\n (T^2)/(2 \pi ) = (L)/(g) \n\n\ (T^2)/(2 \pi )*g=L\n\n L= (2^2)/(2*3,14 )*9,8= (39,2)/(6,28) =6,24m$ $T=2 \pi \sqrt{(L)/(g)} \n (T)/(2 \pi ) = \sqrt{ (L)/(g) }|square\n (T^2)/(2 \pi ) = (L)/(g) \n (T^2)/(2 \pi )*g=L\n L= (2^2)/(2*3,14 )*9,8= (39,2)/(6,28) =6,24m$

You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. the force that pushes forward on you as the bus stops is

Answers

The force that causes you to fall forward is Inertia.

Why is it hazardous to use too small cables and electrodes for a too high current?

Answers

Answer:

It is hazardous to use too small cables and electrodes for too high of a current because the cable may explode because it can't take so much electricity and may damage other parts of the circuit or other wires.

If a photon has a frequency of 1.15 x 10 to the 15 power Hertz what is the energy of the photon given: Planck's constant is 6.63 x 10 to the negative 34 joule seconds

Answers

Answer:

7.62 x $10^(-19)$ J

Explanation:

Given:

frequency 'f'= 1.15 x $10^(15)$ Hz

Planck's constant 'h'= 6.63x $10^(-34)$ Js

Energy of photon can be calculated by the formula:

E= hf

Where,

E= energy of photon

f= frequency of photon

h= Planck's constant

Putting the given values in the formula

E= 6.63x $10^(-34)$ x 1.15 x $10^(15)$

E= 7.62 x $10^(-19)$ J

Therefore, the energy of photon is 7.62 x $10^(-19)$ J

Answer:

Explanation:

Given:

Frequency, f = 1.15 × 10^15 Hz

Plancks constant, h = 6.63 × 10^-34 Js

Using the formula,

Energy, E = h × f

Inputting values,

Energy, E = 1.15 × 10^15 × 6.63 × 10^-34

= 7.6245 × 10^-19 J

Energy of the photon , E = 7.6245 × 10^-19 J.

A change that occurs when a solid melts or a liquid freezes is an example of a phase change.a. True
b. False

Answers

Condensation is the change ofthe substance from liquid to solid phase. Example of this is the formation ofice. Vaporization is the change of substance from liquid to gas phase. Exampleof this is the boiling of water. Deposition is the change of a substance fromgas to solid phase. Example of this is the formation of ice on a winter day.Sublimation is the change of a substance from solid to gas phase. Example ofthis is dry ice. These are all examples of a phase change. The answer is letter A.

Answer:

True

Explanation:

Michelle melted a compound in the lab and performed the same procedure five times. The chart below shows the time it took for the compound to melt during the five trials.Trial Time (min:sec)
1 3:14
2 3:10
3 4:05
4 3:12
5 3:09

After reviewing her data, she realized that trial 3 was vastly different from the other four trial times. Which of the following reasons could explain the radical difference in melting time for trial 3?

A larger quantity of compound was used in trial 3.
The compound started at a lower temperature in trial 3.
The burner was not directly under the compound during trial 3.
all of these

Answers

Answer:

It is actually all of these

Explanation:

Final answer:

Several factors could account for the variance seen in the third trial's melting time. This could be due to using a larger quantity of compound, starting at a lower temperature, or the burner not being directly under the compound.

Explanation:

The radical difference in melting time for trial 3 in Michelle's experiment could be explained by several variables. Given the information present, Michelle could have used a larger quantity of compound in trial 3, thus taking longer to melt. Secondly, the compound may have started at a lower temperature, requiring additional time to reach its melting point. Finally, if the burner was not directly under the compound, this could also explain the longer time as the heat wouldn't be as concentrated on the compound. In other words, the answer could be 'all of these' as they are all potential reasons as to why the third trial had a heavier melting time.