i dont understand ..............

Answer:

3,000,000 Joules!

Explanation:

power=work/t

250000=work/12

work=3,000,000 Joules

Answer:

The weight of the rock on Saturn would be 21.375

Explanation:

Answer:

The trains will be 435 miles apart

Explanation:

Distance covered by the two trains can be obtained by multiplying their speeds with the time frame under consideration - in this our case, it is  3hours.

For Train A

Distance covered = 80mph X 3 hours = 240miles

For train B

Distance covered = 65mph X 3 hours = 195 miles.

The total distance between the two trains after 3 hours will be

240 + 195 = 435 miles

78 is the answer hope it helps

Answer:i f I understand your question correctly, the formula is as follows:

Note: The sign convention is based on distances which are measured from the lens to the object or image of regard. Distances measured in the same direction the light is moving are positive and distances measured in the opposite direction the light is moving are negative.

The measurements are in meters

The “ambient” index of refraction is assumed to be n=1.00

The inverse of the object distance plus the dioptric power of the lens (convex—positive and concave—negative) equals the inverse of the image distance.

Or 1/Od +Dl =1/Id

Please note, it has been a long time since I thought about teaching this concept to students.

Explanation:

a switch    

ssdgfsddgsgbsssdgfsddgsgbsssdgfsddgsgbs

Answer:

No idea now

Explanation:

wil get back to you in few minutes

Answer: A. True

Explanation:

Answer:

A. True

Explanation:

A vector in this sense is a thing that has both magnitude (length) and direction.

Say you're walking at a speed of 5 miles per hour. If you keep walking in a straight line, then in two hours you will have walked 10 miles.

This doesn't give any information about where you started or any information about where you ended up after those 2 hours.

This is because "speed" is a scalar. It's a number with no associated geometry. It's just a magnitude. It's the magnitude of velocity.

Velocity is a vector.

Answer:

The ice sheet as a record of past climates

Scientists have, using those ice cores, obtained information on (proxies for) temperature, ocean volume, precipitation, chemistry and gas composition of the lower atmosphere, volcanic eruptions, solar variability, sea-surface productivity, desert extent and forest fires.

Answer:

The Greenland ice sheet is the last remaining ice sheet from the most recent ice age. Therefore, it can tell scientists about the climate conditions of that period.

Explanation:

Answer:

acceleration and mass are inversely proportional values

Explanation:

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Answer:

A balloon?

Explanation:

it inflates because of the air pressure inside

Answer

Calculate the amount of heat needed to melt 2.00 kg of iron at its melting point (1809 K), given that: ?Hfus = 13.80

Answer:

A continuous flow of negative charges (electrons) creates an electric current. The pathway taken by a electric current is a circuit.

Explanation:

Answer:

Copper, and aluminum

Explanation:

Answer:

Three stages of falling

There are three stages as an object falls through a fluid:

at the start, the object accelerates downwards due to the force of gravity

as the object's speed increases, frictional forces such as air resistance or drag increase

at terminal velocity, the weight of the object due to gravity is balanced by the frictional forces, and the resultant force is zero

Explanation:

Answer:

A & D

Explanation:

Took the test already

The two statements that could be true on the basis of the information given in the question are as follows:

Thus, the correct options are A and D.

The properties of the metal are described as follows:

The silver substance is metal because it is flattened into thin sheets but did not crack. This shows the property of malleability of metals. The white substance is ionic because it is cracked but did not break. It shows that ionic compounds are tough to break.

A red substance is also metal but does not express in any options.

Therefore, the correct options for this question are A and D.

To learn more about the Properties of metal, refer to the link:

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Answer:

A. Increasing the temperature increases how many reactant molecules reach activation energy.

Explanation:

The correct statement is " Increasing the temperature increases how many reactant molecules reach activation energy"

"Activation energy is the minimum amount of energy that must be provided to molecules /atoms of the compounds/ elements to result in a chemical reaction."

When temperature increases the kinetic energy of the molecules increases hence more reactant molecules reach the activation energy.

So it can be concluded that by Increasing the temperature increases how many reactant molecules reach activation energy.

Know more on activation energy here

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Answer:

Explanation:

Turtle ba lls

Answer:

4.8 seconds

Explanation:

Ft=change in momentum

Initial momentum=mv=24*20=480 kg*m/s

new momentum=mv=24*16=384 kg*m/s

change in momentum=96 kg*m/s

Ft=change in momentum

20(t)=96

t=4.8 seconds!

Answer:

i wabnt the points lol

Explanation:

Answer:

Hennessey Venom F5. Power: 1600+ bhp. Price: $1.6 million.

Koenigsegg Regera. Power: 1500 bhp.

Bugatti Chiron. Power: 1479 bhp.

NIO EP9. Power: 1341 bhp. Price: $1.48 million.

Answer:

Explanation:

Can you help me in mathematics

the answer is ( True ) .

the current is the same in series circuits .

Answer: 9.375m/s

Explanation: This is an inelastic collision, so the formula is mv1+mv2=(m1+m2)v-final. My work is a follows:

2500kg(12m/s) + 700kg(0m/s)=(2500kg+700kg)(v-final)

30,000kg(m/s)+0=3200kg(v-final)

30,000kg(m/s)/3200kg=9.375m/s

Answer:

Decibel is used to determine noise level.

Heat generates energy when you melt a solid; as you heat up molecules, they move faster and begin to break apart into a liquid form.

The melting point is the point at which a substance transforms from a solid to a liquid.

The melting point of a liquid is the temperature at which it transforms from a solid to a liquid at atmospheric pressure. This is the point where the liquid and solid phases are in balance.

Heat generates energy when you melt a solid; as you heat up molecules, they move faster and begin to break apart into a liquid form.

The kinetic energy of the molecule is due to the movement of the molecule as the temperature of the system increases the melting point comes closer.

As the temperature increases the kinetic energy of the molecule increases.

Hence the energy, melting point, and temperature relatively affect each other.

To learn more about the melting point refer to the link;

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To learn more about the melting refer to the link;

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Answer:

d. Its magnitude and its direction both remained the same.

Explanation:

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

[tex] Momentum = mass * velocity [/tex]

The law of conservation of momentum states that the total linear momentum of any closed system would always remain constant with respect to time.

This ultimately implies that, the law of conservation of momentum states that if objects exert forces only on each other, their total momentum is conserved.

In this scenario, a rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. Thus, the statement which correctly describes the momentum of the rubber ball is that its magnitude and its direction both remained the same because its velocity didn't change while returning to the thrower.

The correct statement should be "Its magnitude remained the same but its direction changed". Option C is correct.

Given information:

A rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s.

Now, the mass of the ball doesn't change and the magnitude of the velocity is also the same.

Momentum can be defined as the product of mass and velocity. It is a vector quantity because velocity is also a vector quantity, and it has magnitude and direction.

Now, the magnitude of momentum will be the same because mass and velocity don't change in magnitude.

The direction of velocity will be reversed. So, the direction of momentum will also be reversed.

Therefore, the correct statement should be "Its magnitude remained the same but its direction changed". Option C is correct.

For more details about momentum, refer to the link:

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Answer:

(a) An electric iron works on the heating effect of electric current

(b) The heating effect of an electric current is the tendency for electric current to cause the temperature of the material through which it is flowing to rise due to the resistance of the material

The heating effect, 'E', is given by the formula, E = I²·R·t

Where;

I = The current flowing

R = The resistance of the material

t = The time the material takes to heat up

(c) The values showed by Pinki here is the value of care, concern and prevention, to prevent the harmful effect of the high heat on the skin of her daughter

Explanation:

Answer:

The answer is D

The second law of thermodynamics