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3 years ago

Why have fossil fuels become our primary energy resource

2 answers:

8 0

Answer: The fossil fuels are big part of the world today. But my i say get red of it you know but o will. so hope this helps good luck.

Explanation:

The United States gets 81% of its total energy from oil, coal, and natural gas, all of which are fossil fuels. We depend on those fuels to heat our homes, run our vehicles, power industry and manufacturing, and provide us with electricity. Eventually, the degree to which we depend on fossil fuels will have to decline as the planet’s known supplies diminish, the difficulty and cost of tapping remaining reserves increase, and the effect of their continued use on our planet grows more critical. But shifting to new energy sources will take time. In the meantime, how do we use fossil fuels in the most efficient and environmentally responsible way possible?

DerKrebs [107]3 years ago

6 0

Fossil fuels are not our primary source of energy that role plays the sun.

If you turn of the sun you would freeze to death after 1 month.

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A solenoid having an inductance of 6.95 μh is connected in series with a 1.24 kω resistor. (a) if a 12.0 v battery is connected

Serggg [28]

In electrical circuit, this arrangement is called a R-L series circuit. It is a circuit containing elements of an inductor (L) and a resistor (R). Inductance is expressed in units of Henry while resistance is expressed in units of ohms. The relationship between these values is called the impedance, denoted as Z. Its equation is

Z = √(R^2 + L^2)
Z = √((1.24×10^3 ohms)^2 + (6.95×10^-6 H)^2)
Z = 1,240 ohms

The unit for impedance is also ohms. Since the circuit is in series, the voltage across the inductor and the resistor are additive which is equal to 12 V. Knowing the impedance and the voltage, we can determine the maximum current.
I = V/Z=12/1,240 = 9.68 mA
But since we only want to reach 73.6% of its value, I = 9.68*0.736 = 7.12 mA. Then, the equation for R-L circuits is
$I= \frac{V( 1- e^{-t/τ} )}{R}$ , where τ = L/R = 6.95×10^-6/1.24×10^3 = 5.6 x 10^-9
Then,
$7.12x 10^{-3} = \frac{12( 1- e^{-t/5.6x 10^{-9} } )}{1240}$

t = 7.45 nanoseconds
Part B.) If t = 1.00τ, then t/τ = 1. Therefore,
$I= \frac{12( 1- e^{-1 } )}{1240}$

I = 6.12 mA

3 0

3 years ago

Which one of the following is not a simple machine

PilotLPTM [1.2K]

Answer:

4 electric pole is the answer.

3 0

3 years ago

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A particle executes linear harmonic motion about the point x = 0. At t = 0, it has displacement x = 0.37 cm and zero velocity. T

lukranit [14]

Answer:

(a) The period is 4s

(b) The angular frequency is pi/2 radians

(d) The displacement at time is (0.37 cm) cos((pi/2)*t)

(e) The Velocity at time t is v = (0.58 cm)(sin((pi/2)*t)

(f) The maximum speed is $v_{m} = -0.58 cm/s$

(g) The maximum acceleration is 0.91 cm/s^2

Explanation:

We have a particle which oscillates with frequency of f = 0.25 Hz about the point x = 0.At t = 0, the displacement of the particle is = 0.37 cm and its velocity is zero.

(a) The period of the oscillations is,

$T = 1/f$

T = 1/(0.25 Hz)

T = 4.0s

(b) The angular frequency is,

$f = 2\pi f\\$

f = = 2( $\pi$ )(0.25 Hz) = $\pi /2 \\$ radians

The amplitude is the maximum displacement that the particle makes from the equilibrium point, or when the speed of the particle is zero,

that is

$x_{m}$ = 0.37 cm

(d) The displacement as a function of t is given be,

x = $x_{m}$ cos(ωt+Φ)

as x = $x_{m$ t = 0, we get cos(Ф) = 1 = 0

so this equation becomes

x= (0.37 cm) cos((pi/2)*t)

(e) Now we need to find the speed of the particle as a function of t

the speed is the derivative of the displacement that is

$v = dx/dt$ = -(0.37)(pi/2)(sin((pi/2)*t)

so the velocity at time t is

v = (0.58 cm)(sin((pi/2)*t)

(f) Since

$v = v_{m}$ sin(ωt+Ф)

then from part (e) we get

$v_{m} = -0.58 cm/s$

(g)

The amplitude of the maximum acceleration is

$a_{m} = x_{m$ ω^2

= (0.37 cm) (pi/2) = 0.91 cm/s^2

this is the maximum acceleration

4 0

3 years ago

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AEROSPACE On the Moon, a falling object falls just 2.65 feet in the first second after being dropped. Each second it falls 5.3 f

aniked [119]

Answer:

d = 265 ft

Therefore, an object fall 265 ft in the first ten seconds after being dropped

Explanation:

This scenario can be represented by an arithmetic progression AP.

nth term = a + nd

Where a is the first term given as 2.63 ft.

d is the common difference and is given as 5.3ft.

n is the particular second/time.

To calculate how far the object would fall in the first 10 seconds, we can derive it using the sum of an AP.

d = nth sum = (n/2)(2a+(n-1)d)

Where n = 10 seconds

a = 2.65 ft

d = 5.3 ft

Substituting the values we have;

d = (10/2)(2×2.65 + (10-1)5.3)

d = 265 ft

Therefore, an object fall 265 ft in the first ten seconds after being dropped

4 0

3 years ago

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The atomic number of magnesium is 12. This means that its nucleus must contain

lana [24]

<span>The correct answer is D) 12 protons and no electrons. This is correct because the number of protons in the nucleus of the atom is 12. The number of protons in the nucleus represents the atomic number. Therefore if there are 12 protons in the nucleus, the atomic number is 12.</span>

4 0

3 years ago

Read 2 more answers