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Marrrta [24]
3 years ago
6

Pls answer 50 points for an answer!!!!

Physics
1 answer:
lyudmila [28]3 years ago
5 0

ummmn hi i dont know lol

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A cylindrical shell of radius 7.00 cm and length 2.21 m has its charge uniformly distributed on its curved surface. The magnitud
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Answer:

The net charge on the shell is 30x10^-9C

Explanation:

Pls see attached file

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4 years ago
Plz help will mark the brainliest​
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3 years ago
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A block of metal which is 20 cm on a side has a mass of 20 kg. What is it’s density? Please answer in MkS (SI) units.
Ratling [72]

The density of an object is given by:

D = M/V

D = density, M = mass, V = volume

The volume of the cube V is given by:

V = s³

where s = side length

Make a substitution:

D = M/s³

Given values:

M = 20kg, s = 20×10⁻²m

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D = 20/(20×10⁻²)³

D = 2500kg/m³

6 0
3 years ago
We spend our lives in visible light without risks to our health. Yet exposure to UV waves in sunlight can cause skin cancer. Wha
Trava [24]
The correct answer is
<span>B) UV waves are higher frequency and carry more energy. 

In fact, UV waves have higher frequency than visible light. For comparison, visible light has frequency in the range 430-770 THz (</span>10^{12} Hz)<span>, while ultraviolets (UV) have frequency higher than these values (at the order of 1 PHz, </span>1\cdot 10^{15}Hz).

The energy of electromagnetic radiation is proportional to its frequency, according to the equation
E=hf
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3 0
3 years ago
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How long does it took for 250-watt engine to do 2500 joules of work?
bija089 [108]

Answer:

10 second time is required

Explanation:

Formula for power is

P = W/t

Solve for time

t = W/P =2500/250

  t = 10 sec

Mark brainliest if you understand

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