If a substance is heated and then cooled off but remains as the original substance a _____ change has occurred.A) physical
B) chemical
C) structural
D) physical and chemical

Answers

Answer 1

Answer:

I'm going to say physical change

explanation:

The substance as you said did not change therefore a chemical change could not have happened because they result in a new substance meaning one or multiple new substances could have been created from the chemical change. With a physical change the only thing that changes is the outward appearance.

example of physical change: water changing into ice. The frozen water is composed of the same elements as the liquid water.

Hopefully this helped and good luck.

Answer 2

Answer: I'm not a physicist, or an expert, but physical and structural both have a similar meaning, they both relate to appearances, but the question says "but remains as the original substance" so, if it isn't a visible change, then the only good answer left is a chemical change, hope this helps

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which of the following is an example of a concave mirror? surveillance mirror car side mirror reflecting telescope microscopes

Answers

Answer:

Reflecting telescope

Explanation:

A concave mirror is used to concentrate the light falling on it.

A concave mirror of large focal length acts as a reflecting type telescope.

As the rays of light coming from distant object falls on it, then after reflection the rays concentrate at the focus of the concave mirror and then we see the clear image of the distant object.

Reflecting telescopes

The parallel plates in a capacitor, with a plate area of 8.50 cm2 and an air-filled separation of 3.00 mm, are charged by a 6.00 V battery. They are then disconnected from the battery and pulled apart (without discharge) to a separation of 8.00 mm. Neglecting fringing, find (a) the potential difference between the plates, (b) the initial stored energy, (c) the final stored energy, and (d) the work required to separate the plates

Answers

Answer:

(a). The charge is $1.5045*10^(-11)\ C$

(b). The initial stored energy is $4.5135*10^(-11)\ J$

(c). The final stored energy is $12.036*10^(-11)\ J$

(d). The work required to separate the plates is $7.5225*10^(-11)\ J$

Explanation:

Given that,

Area = 8.50 cm²

Distance = 3.00 mm

Potential = 6.00 V

Distance without discharge = 8.00 mm

(a). We need to calculate the capacitance

Using formula of capacitance

$C_(1)=(\epsilon_(0)A)/(d)$

Put the value into the formula

$C_(1)=(8.85*10^(-12)*8.5*10^(-4))/(3.00*10^(-3))$

$C_(1)=2.5075*10^(-12)\ F$

We need to calculate the charge

Using formula of charge

$Q=CV$

Put the value into the formula

$Q=2.5075*10^(-12)*6.00$

$Q=1.5045*10^(-11)\ C$

(b). We need to calculate the initial stored energy

Using formula of initial energy

$E_(i)=(1)/(2)* CV^2$

$E_(i)=(1)/(2)*2.5075*10^(-12)*36$

$E_(i)=4.5135*10^(-11)\ J$

(c). We need to calculate the capacitance

Using formula of capacitance

$C_(2)=(\epsilon_(0)A)/(d)$

Put the value into the formula

$C_(2)=(8.85*10^(-12)*8.5*10^(-4))/(2*8.00*10^(-3))$

$C_(2)=9.403*10^(-13)\ F$

We need to calculate the final stored energy

Using formula of initial energy

$E_(f)=(1)/(2)* (Q^2)/(C)$

$E_(f)=(1)/(2)*((1.5045*10^(-11))^2)/(9.403*10^(-13))$

$E_(f)=12.036*10^(-11)\ J$

(d). We need to calculate the work done

Using formula of work done

$W=E_(f)-E_(i)$

Put the value in the formula

$W=12.036*10^(-11)-4.5135*10^(-11)$

$W=7.5225*10^(-11)\ J$

Hence, (a). The charge is $1.5045*10^(-11)\ C$

(b). The initial stored energy is $4.5135*10^(-11)\ J$

(c). The final stored energy is $12.036*10^(-11)\ J$

(d). The work required to separate the plates is $7.5225*10^(-11)\ J$

A girl rides her moped 5.0 km east and then turns around and rides 2.0 km west. The entire trip takes 15 minutes. What are her average speed and velocity?

Answers

The girl's average speed is 28 km/h, and her average velocity is 8 km/h to the east.

Average speed and average velocity

To calculate the average speed and average velocity, we'll use the following formulas:

Average Speed = Total Distance / Total Time

Average Velocity = Total Displacement / Total Time

Given information:

Distance traveled east = 5.0 km
Distance traveled west = 2.0 km
Total time = 15 minutes = 15/60 hours = 0.25 hours

Total Distance = Distance east + Distance west = 5.0 km + 2.0 km = 7.0 km

Total Displacement = Final position - Initial position = 2.0 km east

Average Speed = 7.0 km / 0.25 hours = 28 km/h

Average Velocity = 2.0 km east / 0.25 hours = 8 km/h (east)

So, the girl's average speed is 28 km/h, and her average velocity is 8 km/h to the east.

More on average speed and average velocity can be found here: brainly.com/question/28512079

#SPJ3

Answer; lol im taking that physics exam as well, a m f confused i cant find the answers on the internet

Explanation: #ripaldinepride

What causes the earths crust to move ?

Answers

Upwelling currents in the molten material beneath the crust.

The rocks that make up the crust are light, compared with the metal-rich material beneath. The crust floats on top like an iceberg. Slow-moving currents underneath propel the continents around the surface

The movement of magma underneath earth's crust.

Every charged particle produces ?

Answers

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How should you test a hypothesis?

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The only way you can test a hypothesis is when you done your experiment or whatever you're doing, then you look back to your hypothesis statement then you see if you're right or wrong!

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If a substance is heated and then cooled off but remains as the original substance a _____ change has occurred.A) physical B) chemical C) structural D) physical and chemical

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If a substance is heated and then cooled off but remains as the original substance a _____ change has occurred.A) physical
B) chemical
C) structural
D) physical and chemical