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defon
3 years ago
5

Zinc oxide helps protect the lifeguards from damaging UV sunlight. How does this cream protect from the UV rays of the Sun? A.Th

e cream is opaque and allows the UV rays to pass through your skin safely. B.The cream is opaque and reflects the UV rays before they reach the skin's surface. C.The cream is transparent and transmits the UV rays as they reach the skin's surface. D.The cream is transparent and absorbs the UV rays after they reach the skin's surface.
Physics
2 answers:
RSB [31]3 years ago
8 0

Answer:

B.The cream is opaque and reflects the UV rays before they reach the skin's surface.

Slav-nsk [51]3 years ago
6 0
The answer would be B
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1. A 0.40 kg ball is launched at a speed of 16 m/s from a 22 m cliff.
Masja [62]

Answer:

51.2 J, 86.2 J, 137.4 J

Explanation:

The kinetic energy of the ball is given by:

K=\frac{1}{2}mv^2

where

m = 0.40 kg is its mass

v = 16 m/s is its speed

Substituting,

K=\frac{1}{2}(0.40)(16)^2=51.2  J

The potential energy of the ball is given by

U=mgh

where

m = 0.40 kg

g=9.8 m/s^2 is the acceleration of gravity

h = 22 m is the heigth of the cliff

Substituting,

U=(0.40)(9.8)(22)=86.2 J

Finally, the total mechanical energy is the sum of the kinetic energy and the potential energy:

E=K+U=51.2 + 86.2=137.4 J

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3 years ago
When the bug is stationary and creating waves, how does the frequency of the wave some distance away from the bug compare with t
Brrunno [24]

Answer:

The frequency is the same

Explanation:

When a wave is created by a source which is vibrating at a certain frequency, the frequency of the wave itself is equal to the frequency of the source.

This occurs with every kind of wave. For instance, if we consider the radio waves produced by an antenna, the frequency of the radio waves is equal to the frequency of the antenna.

In this case, the waves are created by the vibrating bug. The bug is vibrating with a certain frequency f: as a consequence, the frequency f' of the waves produced by the bug will be equal to the frequency of vibration of the bug:

f'=f.

3 0
3 years ago
Two separate but nearby coils are mounted along the same axis. A power supply controls the flow of current in the first coil, an
Anit [1.1K]

Answer:

b.only when the current in the first coil changes.

Explanation:

An induced current flow in the second coil only when there is a change in current in the first cool. A steady current will produce no change in flux (due to magnetic effect of a current) by the first coil, and according to Faraday, induced current is only produced when there is a change in flux linkage.

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3 years ago
Hello all you people who need points use me to get points your welcome :)
frozen [14]

Answer:

Thank you so much!!!!

Explanation:

I really need this points

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3 years ago
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How does a generator produce electrical energy?
Daniel [21]
The correct answer is B. it converts mechanical energy to electrical energy.
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