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2 years ago

Which substance would require the most heat to melt 100 g of the substance?

Physics

1 answer:

IrinaVladis [17]2 years ago

3 0

Assuming all the substances are already at the temperature that is their melting point, we only need to worry about the heat required to change state, not the heat required to change temperature.

No calculations necessary for this question - just look at the latent heat of fusion. The higher this value, the more heat required per unit mass of the substance to melt it. Of the four answer options, aluminum has the highest value and therefore will take the most heat to melt the same mass.

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Two plates of area 30.0 cm^2 are separated by a distance of 0.0590 cm. If a charge separation of 0.0240 μC is placed on the two

topjm [15]

Answer:

V=533.33 V

Explanation:

Given that

A= 30 cm²

d= 0.059 cm

Q= 0.0240 μ C

We know that capacitance given as

$C=\dfrac{\varepsilon _oA}{d}$

Now by putting the values

$C=\dfrac{8.85\times 10^{-12}\times 30\times 10^{-4}}{0.059\times 10^{-2}}$

$C=4.5\times 10^{-11}\ F$

Voltage difference given as

Q= V .C

V=Q/C

$V=\dfrac{0.0240\times 10^{-6}} {4.5\times 10^{-11}}$

V=533.33 V

3 0

2 years ago

What is the charge of the nucleus

taurus [48]

Protons are positive, electrons are negative, and neutrons are neutral. In the nucleus, there are protons and neutrons, so the charge of a nucleus is positive

5 0

2 years ago

Which describes how chemical changes are different from physical changes?

lions [1.4K]

Answer:

B. Chemical changes involve the formation of a new substance.

Explanation:

They can both release energy, both can be measured, and chemical changes can be caused by oxygen, so I believe it would be B.

6 0

3 years ago

A solenoid with a ferromagnetic core is

Ivenika [448]

<span>A coil of current - carrying wire that produces a magnetic field is called a solenoid. An ? is a solenoid with a ferromagnetic core. ?, a device that uses a solenoid to measure small amounts of current. An ? motor is a device that uses an electromagnet to turn an axle.</span>

4 0

2 years ago

Read 2 more answers

Two long straight wires are separated by a distance of d = 0.40 m. The currents are I1 = 1.0 A to the right in the upper wire an

Leni [432]

Answer:

Mangetic field, is 1 μT acting upward due to the current in the upward wire.

Explanation:

Given;

distance of separation of the two wires, d = 0.4 m

the current in the upper wire, I₁ = 1.0 A

the current in the lower wire, I₂ = 8.0 A

The magnetic field at point P, that is a distance d/2 = 0.20 m below the lower wire, is due to the current in the upper wire;

$B = \frac{\mu_oI_1}{2\pi d/2} \\\\B = \frac{4\pi *10^{-7}*1}{2\pi *0.2} = 1*10^{-6} \ T = 1 \mu T$

The direction is upward, since the magnetic field is due to the current in the upward wire.

Therefore, the mangetic field, is 1 μT acting upward due to the current in the upward wire.

7 0

3 years ago

Read 2 more answers