Heat generally <br> Flows from what

g As they reach higher temperatures, most semiconductors... Selected Answer: have an increased resistance. Answers: have a const

pochemuha

Answer:

have an increased resistance

3 0

3 years ago

What is the magnitude of the force a 25 charge exerts on a 3 mc charge 35cm away?

lara31 [8.8K]

The electrostatic force between two charges is given by
$F=k_e \frac{q_1 q_2}{r^2}$
where
ke is the Coulomb's constant
q1 and q2 are the two charges
r is the separation between the charges

In our problem,
$q_1 = 25 \mu C=25 \cdot 10^{-6} C$
$q_2 = 3 mC = 3 \cdot 10^{-3} C$
$r=35 cm=0.35 m$
Therefore the electrostatic force is
$F=(8.99 \cdot 10^9 Nm^2C^{-2}) \frac{(25 \cdot 10^{-6}C)(3 \cdot 10^{-3}C)}{(0.35 m)^2}= 5510 N$

4 0

4 years ago

Two sound waves are traveling through the same medium. They have the same amplitude, wavelength, and direction of travel. If the

Sloan [31]

Answer:

Constructive interference

Explanation:

Here, the medium is same, same wavelength, same frequency, same amplitude and same direction of propagation.

Let the intensity of waves be I which is same for both

The formula for the net intensity is

$I^{2}=I_{1}^{2}+I_{2}^{2}+2I_{1}I_{2}Cos\phi$

where, Ф be the phase difference

So, $I_{R}^{2}=I^{2}+I^{2}+2IICos6\pi$

Here, IR is maximum so the interference is constructive in nature.

7 0

4 years ago

Some hummingbirds beat their wings more than 50 times per second. A scientist is measuring the time it takes for a hummingbird t

Aliun [14]

Answer:

millisecond

Explanation:

Time is measured in seconds in the SI system. The scientist will measure the time it takes to complete one flap of the wings. In the SI system the use of prefix makes it easier to describe the value. It is as follows

$1\ ns=10^{-9}\ s$