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3 years ago

The graph shows the cooling curve of a substance. At which point does the substance begin to melt? A. P B. Q C. R D. S

Physics

2 answers:

Alina [70]3 years ago

4 0

Answer:

A. P

Explanation:

Answer:

A. P

Explanation:

Answer:

A. P

Explanation:

Answer:

A. P

Explanation:

Answer:

A. P

Explanation:

Answer:

A. P

Explanation:

Answer:

A. P

Explanation:

Answer:

A. P

Explanation:

Answer:

A. P

Explanation:

Answer:

A. P

Explanation:

Answer:

A. P

Explanation:

Monica [59]3 years ago

3 0

Answer:

A. P

Explanation:

Melting is the process in which a substance turns from solid state into liquid state. This process occurs when enough heat energy is supplied to the solid substance, so that the molecules inside it start to vibrate so faster that they start breaking the bonds that keep them together.

When heat is supplied to a solid substance, the temperature of the substance increases, because the molecules vibrate faster and faster (and the temperature of a substance is directly proportional to the average kinetic energy of the molecules). However, when the substance reaches the melting point, the temperature stops increasing: above this point, in fact, all the heat provided is used to break the bonds between the molecules, so that the change of phase can occur. This corresponds to point P in the graph. Later, when the solid has completely melted into a liquid, the temperature starts increasing again (point Q).

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Answer:

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3 years ago

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An object is moving with an initial velocity of 19 m/s.It is then subject to a constant acceleration of 2.5 m/s for 15s.How far

bija089 [108]

Answer:

566.3 m

Explanation:

The distance travelled by the object can be found by using the SUVAT equation:

$d=ut+\frac{1}{2}at^2$

where

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u = 19 m/s

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4 years ago

87% of men in the Silent Generation were employed when they were young. Predict: What percentage of Millennial men do you think

olga nikolaevna [1]

The 66 percent of Millennials were employed in the year 2018.

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2 years ago

A 5-N force is applied to a 3-kg ball to change its velocity from 9 m/s to 3 m/s. The impulse is encountered by the ball for a t

anyanavicka [17]

Answer:

3.6 s.

Explanation:

Impulse: This can be defined as the product of force and time. The S.I unit of impulse is N.s.

From newton's second law of motion,

The expression for impulse is given as,

I = Ft = m(u-v) ................. Equation 1

make t the subject of the equation

t = m(v-u)/F................... Equation 2

Where I = impulse, v = final velocity, u = initial velocity, m = mass of the ball, F = force, t = time

Given: m = 3 kg, F = 5 N, u = 9 m/s, v = 3 m/s

Substitute into equation 2

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t = 3.6 s.

4 0

3 years ago

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notsponge [240]

Answer: B

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3 years ago