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cluponka [151]
4 years ago
6

The moon is halfway through the waxing crescent phase. In approximately how many days will it be in the last-quarter phase?

Physics
1 answer:
Jlenok [28]4 years ago
4 0

Let's say the Moon's complete cycle of phases is about 28 days (4 weeks) ... just so the arithmetic is easier. (Close enough. It's actually 29.53 days.)

If it's halfway through the waxing crescent, then it'll reach first quarter in 3 days or so.

From there, it'll take the next 7 days to become Full, and another 7 days to reach last quarter.

Total from half-waxing-crescent to last quarter . . . about 17 days.

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The battery capacity of a lithium ion battery in a digital music player is 750 mA-h. The manufacturer claims that the player can
Oksi-84 [34.3K]

Answer:

The number of electrons is 6.3\times10^{21}\ electrons

(D) is correct option.

Explanation:

Given that,

Battery capacity = 750 mA-h

Time t= 8 hours

Time t'=3 hours

We need to calculate the battery capacity

Battery\ capacity=750\times10^{-3}\times3600

Battery\ capacity=2700\ A-s

We need to calculate the number of electrons in 1 C Li

Using formula for number of electron

n=\dfrac{1}{e}

n=\dfrac{1}{1.6\times10^{-19}}

n=6.25\times10^{18}\ electrons

We need to calculate the number of electron in 2700 C

2700\ C=2700\times6.25\times10^{18}=1.68\times10^{22}\ electrons

The total number of electrons battery can deliver in 8 hours

n=1.68\times10^{22}\ electrons

We need to calculate the number of electron in 3 hours

Using formula of number of electrons

n=\dfrac{n\times t'}{t}

Put the value into the formula

n=\dfrac{1.68\times10^{22}\times3}{8}

n=6.3\times10^{21}\ electrons

Hence, The number of electrons is 6.3\times10^{21}\ electrons

8 0
4 years ago
Read 2 more answers
7. The Voyager 1 space probe was launched in the 1970's and is now the furthest
NikAS [45]

Answer:

v = 16.98 km/s

Explanation:

Given that,

Distance, d = 4500 km

Time, t = 265 s

We need to find its average speed. The total distance covered divided by total time taken is called average speed of an object. So,

v=\dfrac{4500\ km}{265\ s}\\\\=16.98\ km/s

So, the average speed is 16.98 km/s.

6 0
3 years ago
The particle accelerator at CERN can accelerate an electron through a potential
asambeis [7]

Answer:

K.E = 1.28 × 10^-17 KeV

Explanation:

Given that a particle accelerator at CERN can accelerate an electron through a potentialdifference of 80 kilovolts.

To Calculate the kinetic energy (in keV) of the electron​, let us first find the electron charge which is 1.60 × 10^-19C

The kinetic energy = work done

K.E = e × kV

Substitute e and the voltage into the formula

K.E = 1.60 × 10^-19 × 80

K.E = 1.28 × 10^-17 KeV

Therefore, the kinetic energy is approximately equal to 1.28 × 10^-17 KeV

8 0
4 years ago
Which of the following is not a an example of dissipated energy?
Kaylis [27]
Which of the following is not a an example of dissipated energy?
b. kinetic

When energy is changed from one form to another, ____.

b. all of the energy can be accounted for

4 0
3 years ago
A wire of resistance R is cut into ten equal parts which are then connected in parallel. The equivalent resistance of the combin
Greeley [361]

Answer:

<em>The equivalent resistance of the combination is R/100</em>

Explanation:

<u>Electric Resistance</u>

The electric resistance of a wire is directly proportional to its length. If a wire of resistance R is cut into 10 equal parts, then each part has a resistance of R/10.

Parallel connection of resistances: If R1, R2, R3,...., Rn are connected in parallel, the equivalent resistance is calculated as follows:

\displaystyle \frac{1}{R_e}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}+...+\frac{1}{R_n}

If we have 10 wires of resistance R/10 each and connect them in parallel, the equivalent resistance is:

\displaystyle \frac{1}{R_e}=\frac{1}{R/10}+\frac{1}{R/10}+\frac{1}{R/10}...+\frac{1}{R/10}

This sum is repeated 10 times. Operating each term:

\displaystyle \frac{1}{R_e}=\frac{10}{R}+\frac{10}{R}+\frac{10}{R}+...+\frac{10}{R}

All the terms have the same denominator, thus:

\displaystyle \frac{1}{R_e}=10\frac{10}{R}=\frac{100}{R}

Taking the reciprocals:

R_e=R/100

The equivalent resistance of the combination is R/100

6 0
3 years ago
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