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4 years ago

Two energy resources that do not depend on the sun's energy

Physics

2 answers:

svp [43]4 years ago

8 0

The only one I can think of is nuclear energy.

Oh well, I guess geothermal might also qualify.

Stolb23 [73]4 years ago

5 0

Windmill and waterweel

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Why do materials absorb some frequencies of electromagnetic radiation and not others?

AlekseyPX

Well energy absorption by a material depends upon their atomic properties. Energy is absorbed in discrete quanta of energy as predicted by quantum mechanics only if the corresponding energy state is available either it is absorbed by electrons or nucleus depends whether it can go to permissible energy state, if not system can't absorb energy at all.

8 0

3 years ago

Question 2 of 5

Andrews [41]

Lifting weights, did this yesterday :))

4 0

3 years ago

Read 2 more answers

Calculate the equivalent resistance for both circuits.

Allisa [31]

Answer:

Series equivalent resistance: $R_{eq} = 6 \Omega$

Parallel equivalent resistance: $R_{eq}=14\Omega$

Explanation:

The equivalent resistance in series circuit is calculated as

$R_{eq} = R_{1} + R_{2}$

$R_{eq} = 2 + 4$

$R_{eq} = 6 \Omega$

The equivalent resistance in parallel circuit is calculated as

$\frac{1}{R_{eq}} = \frac{1}{R_{1}}+\frac{1}{R_{2}}$

Which can be simplified to

$R_{eq}=\frac{R_{1}\times R_{2}}{R_{1}+R_{2}}$

$R_{eq}=\frac{21\times 42}{21+42}$

$R_{eq}=14\Omega$

The parallel circuit has the higher equivalent resistance as compared to series circuit.

5 0

4 years ago

A 8.0-cm long solenoid has 2000 turns of wire and carries a current of 5.0-A. Calculate the strength of the magnetic field at th

CaHeK987 [17]

Answer:

B = 0.157 T

Explanation:

Given that,

Length of the solenoid, l = 8 cm = 0.08 m

Number of turns in the wire, N = 2000

Current, I = 5 A

We need to find the strength of the magnetic field at the center of the solenoid. It is given by the formula as follows :

$N=\mu_o nI$ , N is number of turns per unit length of solenoid.

So,

$B=4\pi \times 10^{-7}\times \dfrac{2000}{0.08}\times 5\\\\=0.157\ T$

So, the magnetic field at the center of the solenoid is 0.157 T.

6 0

3 years ago

I drop a quarter from a 2 story house. It takes 1.85 to hit the ground. what was the velocity

Valentin [98]

At the instant you dropped it from your hand, its speed was zero.
The coin gained 9.8 m/s every second it fell. At the end of 1.85 sec,
just before it went 'tink' onto the ground, its speed was

(9.8 m/s) x (1.85 sec) = 18.13 m/s .

Its velocity at that final instant was 18.13 m/s downward.

7 0

3 years ago