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Brums [2.3K]
3 years ago
11

__________energy might also be released during a chemical reaction

Physics
1 answer:
pentagon [3]3 years ago
7 0
Kinetic energy i think
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If the current through a 20-Ω resistor is 8.0 A , how much energy is dissipated by the resistor in 1.0 h ? Express your answer w
marshall27 [118]

Answer:

P(3600)=593.247W

Explanation:

First, let's find the voltage through the resistor using ohm's law:

V=IR=20*8=160V

AC power as function of time can be calculated as:

P(t)= V*I*cos(\phi)-V*I*cos(2 \omega t-\phi)  (1)

Where:

\phi=Phase\hspace{3}angle\\\omega= Angular\hspace{3}frequency

Because of the problem doesn't give us additional information, let's assume:

\phi=0\\\omega=2 \pi f=2*\pi *(60)=120\pi

Evaluating the equation (1) in t=3600 (Because 1h equal to 3600s):

P(3600)=160*8*cos(0)-160*8*cos(2*120\pi*3600-0)\\P(3600)=1280-1280*cos(2714336.053)\\P(3600)=1280-1280*0.5365255751\\P(3600)=1280-686.7527361=593.2472639\approx=593.247W

5 0
4 years ago
Need help on this thermal physics question ASAP please
Trava [24]
Since V is 5 times larger than C

A) 0V = 25C

25C to 0C = -25
-25 / 5 = -5

so 0C = -5 V

B)

20V x 5 = 100 C


6 0
3 years ago
Repulsion is the sure way to test magnetism.Why?​
jeyben [28]

Answer:

Repulsion is the sure test for magnetism because it occurs only when two like poles of a magnet exist while the attraction phenomenon can occur between two unlike poles of a magnet and also between a magnet and a magnetic material means if there are two magnets they will attract each other and suppose if one material

8 0
3 years ago
It has been theorized that all of the modern continents on Earth were once part of a single continent. What scientific evidence
HACTEHA [7]

Answer:

B

Explanation:

It is not just one of these answers, in fact they all make sense. But the one I learned in school was that when the continents were still one super continent- Pangea, animals fossilized wear the borders of modern day continents were. This later on scientists found half of an animal fossil on the edge of one continent and the other half on the edge of a different continent.

hope this helps

~Lalagrl

4 0
4 years ago
Read 2 more answers
CCDs are _____ format detectors, which detect photons with _____ efficiency. analog, high analog, low digital, high digital, low
mars1129 [50]
High digital and high are the answers.

hope this helps
7 0
3 years ago
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