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Vedmedyk [2.9K]
3 years ago
12

Renewable energy energy is an important alternate source of energy. Why?

Physics
1 answer:
Svet_ta [14]3 years ago
5 0

Answer:

Renewable energy is important because, unlike nonrenewable energy, renewable energy sources replenish overtime.

Explanation:

Nonrenewable energy sources, such as fossil fuels, will eventually run out because they do not replenish in a reasonable amount of time. On the other hand, renewable energy sources, like windand solar power and biofuel, are unlimited or practically unlimited.

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You have a radioactive sample with a half-life of 1 hour. At t = 1 hour, a Geiger counter measures its radiation at 40 counts/mi
Mama L [17]

Answer:

Explanation:

Given that, .

The half-life of a radioactive element is

t½ = 1 hr.

At the first hour, the radioactive element has 40 counts/minute

After 4 hours it has 5 counts/minute

So,

We want to filled the table.

0 hours, I.e at the start

40 counts/mins × 2 = 80 counts / mis

First half-life (first hour) is

40 counts/mins

Second half-life (second hour)

40 counts/mins × ½ = 20 counts/mins

Third half-life (third hour)

40 counts/mins × ¼ = 10 counts / mins

Fourth half life (fourth hour)

40 counts/mins × ⅛ = 5 counts / mins

So, the table is

Time........................Geiger Counter Rate

0 hours.................... 80 counts / minutes

1 hour........................ 40 counts / minutes

2 hours..................... 20 counts / minutes

3 hours..................... 10counts / minutes

4 hours...................... 5 counts / minute

6 0
3 years ago
WGVU-AM is a radio station that serves the Grand Rapids, Michigan area. The main broadcast frequency is 1480kHz. At a certain di
Yuki888 [10]

Answer:

a

  \lambda  =  202.7 \  m

b

  w =  9.3 *10^{6} \  rad/s

c

  k = 0.031 m^{-1}

d

  E_{max} = 9.0 *10^{-3} \  V/m

Explanation:

From the question we are told that  

       The frequency of the radio station is  f=  1480 \  kHz  =  1480 *10^{3}\ Hz

         The magnitude of the magnetic field is  B  =  3.0* 10^{-11} \  T

Generally the wavelength is mathematically represented as

          \lambda  =  \frac{c}{f}

Here c is the speed of light with value  c =  3.0 *10^{8} \ m/s

So

        \lambda  =  \frac{3.0 *10^{8}}{ 1480 *10^{3}}

=>      \lambda  =  202.7 \  m

Generally the angular frequency is mathematically represented as

       w =  2 \pi * f

=>   w =  2 * 3.142 *  1480 *10^{3}

=>   w =  9.3 *10^{6} \  rad/s

Generally the wave number is mathematically represented as        

=>      k = \frac{2 \pi }{\lambda}

=>      k = \frac{2  *  3.142  }{ 202.7}

=>      k = 0.031 m^{-1}

Generally the amplitude of the electric field at this distance from the transmitter is mathematically represented as

         E_{max} = c *  B

=>      E_{max} = 3.0 *10^{8} *   3.0* 10^{-11}

=>      E_{max} = 9.0 *10^{-3} \  V/m

3 0
2 years ago
A bullet is fired from a gun at 45° angle to the horizontal with a velocity of 500 m/s. Find the
rjkz [21]

answer :

D. 6370.92 m

Explanation:

pls refer to the attachment...

7 0
3 years ago
The words can only be used onece. Use the words to complete the sentences below: Switch, break, on, complete, electricity, bulb,
lilavasa [31]

Answer:

A circuit which has a battery in it will not allow electricity to flow through it. A device called a switch can be used to complete a circuit so that other devices can be switched on or off.

Explanation:

^^^

8 0
2 years ago
Express 75−−√ in the form ab√.
Nana76 [90]
We can write 75 = 25 x 3
and √75 = <span>√ (25 x 3) = </span>√25 x <span>√3 
Now we know that square root of 25 is 5 a 5x5 = 25 
so we can express this in the form of 5</span><span>√3.</span>
8 0
3 years ago
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