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ozzi
3 years ago
8

What can we say about energy on

Physics
1 answer:
Marina CMI [18]3 years ago
8 0

Answer:

A. Longer wavelengths and less dangers

Explanation:

Radio waves are at the lowest end of the EM spectrum, they have the longest wavelength of any other EM waves, the lowest energy and, accordingly, the lowest frequency;

Their low energy and frequency means they pose little risk of harm or danger as they don't get absorbed by human being.

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What happens to molecules when their kinetic energy decreases?
Illusion [34]

Answer:

The speed of molecule decreases and temperature also decreases

Explanation:

Kinetic energy of the molecules of a subsance is directly proportional to the temperature of molecule So as the kinetic energy decrease, temperature also decreases. decreses their speed.

6 0
3 years ago
Calculate the answer to the correct number of significant digits<br> 0.055 * 5.1 =
I am Lyosha [343]

Answer:

0.055 * 5.1 = 0.2805

Explanation:

I used a calculator so it should be accurate! yw!! :D

8 0
3 years ago
The change in momentum of a body weighing 5 kg when its velocity increases from 10 m/s to 20 m/s in 10 s will be- PLEASEEE HELPP
Tanzania [10]

Answer:

the <u>brook</u><u> </u><u>finally</u><u> </u><u>joins</u><u> </u><u>the</u><u> </u><u>river</u><u> </u><u>true</u><u> </u><u>or</u><u> </u><u>false</u><u> </u><u>answer</u><u> </u><u>to</u><u> </u><u>your</u><u> </u><u>email</u><u> </u><u>address</u><u> </u>

5 0
3 years ago
A coin dropped in the lift it takes time 0.5 s to reach the floor when lift is staionary it takes time t when lift is moving up
BARSIC [14]

Answer:

t₁ > t₂

Explanation:

A coin is dropped in a lift. It takes time t₁ to reach the floor when lift is stationary. It takes time t₂ when lift is moving up with constant acceleration. Then t₁ > t₂,  t₁ = t₂,  t₁ >> t₂ ,  t₂ > t₁

Solution:

Newton's law of motion is given by:

s = ut + (1/2)gt²;

where s is the the distance covered, u is initial velocity, g is the acceleration due to gravity and t is the time taken.

u = 0 m/s, t₁ is the time to reach ground when the light is stationary and t₂ is the time to reach ground when the lift is moving with a constant acceleration a.

hence:

When stationary:

s=\frac{1}{2}gt_1^2\\\\t_1^2=\frac{2s}{g}  \\\\When\ moving\ with\ acceleration(a):\\\\s=\frac{1}{2}(g+a)t_2^2\\\\t_2^2=\frac{2s}{g+a}

Hence t₂ < t₁, this means that t₁ > t₂.

4 0
3 years ago
The strength of the electric field 0.5 m from a 6 uC charge is
Triss [41]

Answer:

E= 2.158× 10*5N/C

Explanation:

K= 8.99×10*9, q= 6×10*-6C, d= 0.5m

E= kq/d*2

E= (8.99×10*9× 6×10*-6)/0.5*2

E= 215760

E= 2.158 ×10*5N/C

5 0
3 years ago
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