Physics, 28.10.2020 18:10 zoewilliamss26
You can't always see electromagnetic waves, but they are found throughout
the universe. There are only a few waves that are visible to the human eye.
Electromagnetic radiation is used to meet our needs and wants. It makes
important things โ like medical imaging, reheating food and cell phones
possible. Radiation can be helpful for sending texts, but it's not always a
good thing. The sunburn you get sitting on the beach is caused by
electromagnetic radiation, too.
The author of this passage would most likely agree with which of the following
statements?
A
Scientists do not know very much about electromagnetic waves.
B
Electromagnetic radiation can be both helpful and harmful to humans.
ั
People understand electromagnetic waves better than ocean waves.
D
Electromagnetic radiation is more harmful than it is helpful.
Answers: 2
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Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?
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Physics, 22.06.2019 16:40
The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?
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Physics, 22.06.2019 18:30
Asmall grinding wheel has a moment of inertia of 4.0ร10โ5 kgโ
m2 . what net torque must be applied to the wheel for its angular acceleration to be 150 rad/s2 ?
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Physics, 22.06.2019 20:20
Area around a charged object where the objects can exert a force on another charged objects is an electric
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You can't always see electromagnetic waves, but they are found throughout
the universe. There are o...
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