PHYSICS MIDDLE SCHOOL

How is Ohm's Law related to house fires?

Answers

Answer 1
Answer: I got my bachelor's degree in Electrical Engineering in 1973, and 
I have worked with electricity and electronics during the 43 years
since then.  Maybe I'm missing something obvious, but I can't think
of any connection between Ohm's Law and house fires.  I'm really sorry.

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What has to happen for a feather and a ball to fall at the same rate?

Answers

Because the force of gravity is different for both of these objects, they will not fall at the same rate. To make both of these fall at the same rate, we need both to have the same mass so that the gravitational pull is equivalent also. 
They will NOT fall at the same late.
A ball will fall much faster than a feather. A feather tends to float down, much as a ball, it immediately drops. 

Which liquid will evaporate the fastest water salt water pepsi and gatorade?

Answers

The liquid that will evaporate the quickest would be water. 
~The rest are mixtures, and have more ingrediants in them, therefore the answer should be water. (in which it has no other ingrediants in it but water itself)

Why is it a better to wear a white shirt on a hot summer day instead of a black shirt?

Answers

because when you wear a black shirt it absorbs more heat because it is a dark collor
Yes, it is better to wear a white shirt because black is a color that attracts sunlight, therefore, making you sweat more if you wore the black shirt. 

Compare an contrast a cell to a human body

Answers

Cells make up the Tissue, which make up our Organs, which make our Organ Systems, Which make us our bodies. They make us up and are alive. They grow, feed, reproduce, and die. The main difference between our size would be our levels of complexity.
this is the answer
i think so 
does it help?

A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car?Express the speed to two significant figures and include the appropriate units.

Answers

The speed of the car is 75 km/h

Further explanation

These are the formulas that we have to remember before solving the problem.

Speed is the rate of change of distance.

\large { \boxed {v = (d)/(t)}}

v = speed ( m/s )

d = distance ( m )

t = time ( s )

Acceleration is the rate of change of velocity.

\large { \boxed {a = (\Delta v)/(t)}}

a = acceleration ( m/s² )

Δv = change in speed ( m/s )

t = time ( s )

Let us now tackle the problem!

Given:

distance = d = 150 km

time taken = t = 7200 s = 2 hours

Unknown:

velocity = v = ?

Solution:

v = (d)/(t)

v = (150)/(2)

\large {\boxed {v = 75~km/h} }

The acceleration of the car is 0 m/s² because it travels with constant speed.

We could also plot the distance vs time graph as shown in the attachment.

Learn more

Answer details

Grade: Middle School

Subject: Physics

Chapter: Kinematics

Keywords: indycar top speed of a fastest police car has ever gone

Final answer:

The car's speed is 75 km/hour, as determined by dividing the total distance travelled (150 km) by the total time taken (2 hours).

Explanation:

To answer this question, we use the

formula for speed

, which is distance traveled divided by the time taken. Here, the distance travelled by the car is 150 km and the time taken is 7200 s (which is equal to 2 hours). Therefore, the speed will be 150 km divided by 2 hours, resulting in a speed of

75 km/hour

, stated to the correct number of significant figures.

Learn more about Speed Calculation here:

brainly.com/question/35969362

#SPJ6

Describe a process in which energy changes forms at least twice. Are there any unwanted forms of energy that are produced during the energy transformations?

Answers

Explanation:

Consider the example of the electric fan. The electrical energy used in the electric fan is greater than the kinetic energy of the moving fan blades.

According to the law of conservation of the energy, the energy is neither created nor destroyed. It always remains same.

The electrical energy used in the electric fan is also used in the producing unwanted sound energy.

The electrical energy in the electric fan is converted into any unwanted forms of energy. Like in producing unwanted sound energy and the heat energy. If the electric fan shakes then some of the electric energy is converted into unwanted kinetic energy.

Here, the electrical energy changes into sound energy, heat energy and kinetic energy.
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