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3 years ago

6

one deterrent to burglary is to leave your front porch light on all the time if your fixture contains the 23 watt compact fluore

scent bulb at 120 volts and your local power utility cell's energy at ten cents per kilowatt-hour how much will it cost to leave the bulb on for the entire month

1 answer:

sweet [91]3 years ago

6 0

Answer:

Cost = 165.6 cents = $1.656

Explanation:

First, we will calculate the total energy consumed by the bulb in a month:

$E=Pt\\$

where,

E = Energy Consumed = ?

P = power = 23 W

t = time = (1 month)(30 days/1 month)(24 h/1 day) = 720 h

Therefore,

$E = (23\ W)(720\ h)\\E = 16560\ Wh = 16.56\ Kilowatt-hour$

Now, the cost will be:

$Cost = P(Unit\ Cost)\\Cost = (16.56\ kilowatt-hour)(10\ cents/kilowatt-hour)$

<u>Cost = 165.6 cents = $1.656</u>

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When a spinning star shrinks in radius, it speeds up. Which of the following statements explains this phenomenon?

Sever21 [200]

Answer:

B.)Angular momentum is always conserved

Explanation:

Angular momentum is given by:

$L=mvr$

where

m is the mass of the object

v is its speed

r is the distance between the object and the centre of its circular trajectory

In absence of external torques, angular momentum is always conserved. That means that for the spinning star, if its radius r decreases (because it shrinks), in order for L (the angular momentum) to be conserved, the speed (v) must increases, therefore the spinning star speeds up.

So, the correct choice is

B.)Angular momentum is always conserved

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3 years ago

Similarities and differences between high pitch and low pitch

umka2103 [35]

You can hear a difference between these two sounds. That is because their pitch isdifferent. Pitch depends on the frequency of a sound wave. ... High sounds have highfrequencies and low sounds have lowfrequencies.

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4 years ago

A block of cheese is resting on an incline.

andreev551 [17]

Answer:

The answer is diagram B I tried it out and it worked

Explanation:

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3 years ago

A liquid of density 1270 kg/m3 flows steadily through a pipe of varying diameter and height. At Location 1 along the pipe, the f

FinnZ [79.3K]

Answer:

${P_2}-P_1=49.99\ KPa$

Explanation:

$v_1=9.43\ m/s$

$d_1=11.7\ cm/s$

$d_2=17.5\ cm/s$

From continuity equation

$A_1v_1=A_2v_2$

$v_1d_1^2=v_2d_2^2$

$v_2=\dfrac{9.43\times 11.7^2}{17.5^2}$

$v_2=4.21\ m/s$

$\dfrac{P_1}{\rho g}+\dfrac{v_1^2}{2g}+y_1=\dfrac{P_2}{\rho g}+\dfrac{v_2^2}{2g}+y_2$

${P_1}+\rho\dfrac{v_1^2}{2}+\rho y_1g={P_2}+\rho\dfrac{v_2^2}{2}+\rho y_2g$

$\rho\dfrac{v_1^2}{2}+\rho y_1g -\rho\dfrac{v_2^2}{2}-\rho y_2g={P_2}-P_1$

$1270\times \dfrac{9.43^2}{2}+1270\times 0\times 10 -1270\times\dfrac{4.21^2}{2}-1270\times 0.175\times 10={P_2}-P_1$

${P_2}-P_1=49.99\ KPa$

4 0

3 years ago

An equation for the period of a planet is 4 pie² r³/Gm where T is in secs, r is in meters, G is in m³/kgs² m is in kg, show that

marishachu [46]

Answer:

$\displaystyle T = \sqrt{\frac{4\, \pi^{2} \, r^{3}}{G \cdot m}}$ .

The unit of both sides of this equation are $\rm s$ .

Explanation:

The unit of the left-hand side is $\rm s$ , same as the unit of $T$ .

The following makes use of the fact that for any non-zero value $x$ , the power $x^{-1}$ is equivalent to $\displaystyle \frac{1}{x}$ .

On the right-hand side of this equation:

$\pi$ has no unit.
The unit of $r$ is $\rm m$ .
The unit of $G$ is $\displaystyle \rm \frac{m^{3}}{kg \cdot s^{2}}$ , which is equivalent to $\rm m^{3} \cdot kg^{-1} \cdot s^{-2}$ .
The unit of $m$ is $\rm kg$ .

$\begin{aligned}& \rm \sqrt{\frac{(m)^{3}}{(m^{3} \cdot kg^{-1} \cdot s^{-2}) \cdot (kg)}} \\ &= \rm \sqrt{\frac{m^{3}}{m^{3} \cdot s^{-2}}} = \sqrt{s^{2}} = s\end{aligned}$ .

Hence, the unit on the right-hand side of this equation is also $\rm s$ .

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3 years ago