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3 years ago

Give an example of how electrical energy and thermal energy are connected.

1 answer:

3 0

A toaster draws electric current (electrical energy) from a wall outlet and converts these moving electric charges into heat (thermal energy) in the filaments that turn red hot to cook your toast. ... As electricity runs through the filaments in a space heater, the electrical energy is converted into heat (thermal energy).
Hopefully this helped.

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Light with a wavelength of 400 nm strikes the surface of cesium in a photocell, and the maximum kinetic energy of the electrons

Firdavs [7]

Answer:

The longest wavelength of light that is capable of ejecting electrons from that metal is 1292 nm.

Explanation:

Given that,

Wavelength = 400 nm

Energy $E=1.54\times10^{-19}\ J$

We need to calculate the longest wavelength of light that is capable of ejecting electrons from that metal

Using formula of energy

$E = \dfrac{hc}{\lambda}$

$\lambda=\dfrac{hc}{E}$

Put the value into the formula

$\lambda=\dfrac{6.63\times10^{-34}\times3\times10^{8}}{1.54\times10^{-19}}$

$\lambda=1292\times10^{-9}\ m$

$\lambda=1292\ nm$

Hence, The longest wavelength of light that is capable of ejecting electrons from that metal is 1292 nm.

8 0

3 years ago

two objects are in uniform circular motion at the same speed but at different radii. the ones with the __ radius has the largest

Cerrena [4.2K]

Answer:the one with the smaller radius has the highest centripetal force

Explanation:

5 0

2 years ago

Read 2 more answers

A 60 kg student in a rowboat on a still lake decides to dive off the back of the boat. The studen'ts horizontal aceleration is 2

TiliK225 [7]

As per the third law of Newton, the force exerted by the boat over the student is equal in magnitude to the force that the student exerted on the boat.

So, calculate the force on the student using the second law of Newton, Force = mass * acceleration.

Force on the student = 60 kg * 2.0 m/s^2 = 120 N.

=> horizontal force exerted by the student on the boat = 120 N

Answer: option d. 120 N. toward the back of the boat.

Of course it is toward the back because that is where the student jumped from..

4 0

3 years ago

Greenhouse gases are essential to support life on earth.

Kryger [21]

Answer:

True we need greenhouses for carbon dioxide

3 0

2 years ago

Read 2 more answers

If c1=c2=4.00μf and c4=8.00μf, what must the capacitance c3 be if the network is to store 2.70×10−3 j of electrical energy?

Akimi4 [234]

Missing detail in the text: total voltage of the circuit $\Delta V = 46.0 V$
Missing figure: https://www.physicsforums.com/attachments/prob-24-68-jpg.190851/

Solution:

1) The energy stored in a circuit of capacitors is given by
$U= \frac{1}{2} C_{eq} (\Delta V)^2$
where $C_{eq}$ is the equivalent capacitance of the circuit. We can find the value for $C_{eq}$ by using $\Delta V=46.0 V$ and the energy of the system, $U=2.7\cdot 10^{-3} J$
$C_{eq}= \frac{2U}{(\Delta V)^2}=2.55\cdot 10^{-6} F=2.55\mu F$

2) Then, let's calculate the equivalente capacitance of C1 and C2. The two capacitors are in series, so their equivalente capacitance is given by
$\frac{1}{C_{12}}= \frac{1}{C_1}+ \frac{1}{C_2}= \frac{1}{4 \mu F} + \frac{1}{4 \mu F}$
from which we find $C_{12}=2 \mu F$

3) Then let's find $C_{123}$ , the equivalent capacitance of $C_{12}$ and C3. $C_{123}$ is in series with C4, therefore we can write
$\frac{1}{C_{eq}}= \frac{1}{C_{123}}+ \frac{1}{C_4}$
Since we already know $C_4=8 \mu F$ and $C_{eq}=2.55 \mu F$ , we find
$C_{123}=3.70 \mu F$

4) Finally, we can find $C_{3}$ , because it is in parallel with $C_{12}$ , and the equivalent capacitance of the two must be equal to $C_{123}$ :
$C_{123}=C_{12}+C_3$
So, using $C_{123}=3.70 \mu F$ and $C_{12}=2 \mu F$ , we find
$C_3=1.70 \mu F$

7 0

2 years ago