2 years ago

A cube with sides of length 2cm has a mass of 7.36g . calculate the density of the cube

Physics

1 answer:

kondor19780726 [428]2 years ago

7 0

Density = 7.36 grams ÷ (2 cm × 2 cm × 2cm) = 0.92 g/cm^3

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Question 2 of 25

True [87]

Answer: The symbol representing the result of a gas expanding against a constant pressure is W

Explanation:

According to first law of thermodynamics, energy can neither be destroyed nor created but rather transferred to one place to another and converted to and from other energy forms.

The mathematical form of first law of thermodynamics is:

$\Delta U=q+W$

where $\Delta U$ = change in internal energy

q = heat absorbed or released

W = work $(W= P\Delta V)$

P = pressure

$\Delta V$ = volume change

Thus the changes in heat or work leads to change in internal energy.

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2 years ago

You are given a semiconductor resistor made from silicon with an impurity concentration of resistivity 1.00×10−3ωm. the resistor

Vlad [161]

Answer: Resistance = $3.2 \Omega$ , Current = 1.56 A, Voltage =4.99 V

The resistance,

$R=\frac {\rho l}{A}$

where, $\rho$ is resistivity, A is the area and l is the length of the resistor.

It is given that:

$\rho=1.0\times10^{-3}\Omega m$

Length, l=2 mm

Area, $A= width \times height=1.25 mm\times 0.5 mm=0.625 mm^2$

Hence, $R=\frac{1.0\times10^{-3}\Omega m \times 2\times10^{-3}m}{0.625\times10^{-6}m^2}=3.2\Omega$

We know, Power, $P=I^2R$

$\Rightarrow I=\sqrt{\frac{P}{R}}$

$P=7.81 W$

$I=\sqrt{\frac {7.81 W}{3.2\Omega}}=\sqrt{2.44}A=1.56A$

We know, Voltage, $V=IR=1.56\times3.2=4.99 V$

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2 years ago

When did the object have the highest average

miv72 [106K]

Answer:

Between 120 and 180 seconds

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2 years ago

A student wants to get real and inverted

sveta [45]

Answer:

concave mirror

Explanation:

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2 years ago

Write relationship between hertz and megahertz

dusya [7]

Explanation:

1 mega Hertz = 1000000 hertz

8 0

2 years ago