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Thepotemich [5.8K]
3 years ago
6

Find the density of a block with a length of 8.0 cm, a width of 4.0 cm, a height 2.0 cm,

Chemistry
1 answer:
SpyIntel [72]3 years ago
4 0

Answer:

0.80 g cm^-3

Explanation:

\rho=\frac{mass}{volume} \\volume= l \times w \times h = 8.0 cm \times 4.0 cm \times 2.0 cm = 64 cm^3\\\rho = \frac{51 g}{64 cm^3} =

= 0.80 g cm^-3

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If a 12-volt battery produces a current of 20 amps, what is the resistance?
mixas84 [53]

Answer:

0.6 Ω

Explanation:

From the question given above, the following data were obtained:

Voltage (V) = 12 V

Current (I) = 20 A

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From Ohm's law,

V = IR

Where:

V => is the voltage

I => is the current

R => R is the resistance

With the above formula, we can obtain the resistance as follow:

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Current (I) = 20 A

Resistance (R) =?

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Thus the resistance is 0.6 Ω

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3 years ago
Why can't chemical changes be reversed?
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4 years ago
If the producers of the ecosystem below make 14,000 units of energy. How much energy would be available to the very top trophic
STALIN [3.7K]

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8 0
3 years ago
Be sure to answer all parts. Enter your answers in scientific notation.
Andrews [41]

Answer:

a) f = 3.02x10¹⁵ s⁻¹, and λ = 99.4 nm.

b) 99.4 nm

Explanation:

a) The energy of radiation is given by:

E = h*f

Where h is the Planck constant (6.626x10⁻³⁴ J.s), and f is the frequency. To have the highest frequency, the energy must be the highest too, because they're directly proportional. So we must use E = -E1 = 20x10⁻¹⁹ J

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f = 3.02x10¹⁵ s⁻¹

The wavelenght is the velocity of light (3.00x10⁸ m/s) divided by the frequency:

λ = 3.00x10⁸/3.02x10¹⁵

λ = 9.94x10⁻⁸ m = 99.4 nm

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8 0
3 years ago
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