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otez555 [7]
3 years ago
13

How many full length strands of hair are collected from the scalp to use as a sample?

Physics
1 answer:
laila [671]3 years ago
4 0
50 strands is the standard procedure
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10 Select the correct answer. What property of a wave remains unchanged when a wave enters a different medium? O A amplitude OB.
Mama L [17]

a and b ik thats the awser becuse imjust did it

8 0
3 years ago
Read 2 more answers
A circuit breaker is rated for a current of 25 a rms at a voltage of 240 v rms. (a) what is the largest value of imax that the b
Mademuasel [1]

The largest value of current that the breaker can carry = Imax=35.4A

Explanation:

Rms value of current= Irms= 25 A

The rms current and the maximum current are related as

Imax= √2 Irms

Imax=√2 (25)

Imax=35.4 A

Thus the maximum current carried by the breaker= 35.4 A

8 0
3 years ago
The 45-g arrow is launched so that it hits and embeds in a 1.40 kg block. The block hangs from strings. After the arrow joins th
worty [1.4K]

Question: How fast was the arrow moving before it joined the block?

Answer:

The arrow was moving at 15.9 m/s.

Explanation:

The law of conservation of energy says that the kinetic energy of the arrow must be converted into the potential energy of the block and arrow after it they join:

\dfrac{1}{2}m_av^2 = (m_b+m_a)\Delta Hg

where m_a is the mass of the arrow, m_b is the mass of the block, \Delta H of the change in height of the block after the collision, and v is the velocity of the arrow before it hit the block.

Solving for the velocity v, we get:

$v = \sqrt{\frac{2(m_b+m_a)\Delta Hg}{m_a} } $

and we put in the numerical values

m_a = 0.045kg,

m_b = 1.40kg,

\Delta H = 0.4m,

g= 9.8m/s^2

and simplify to get:

\boxed{ v= 15.9m/s}

The arrow was moving at 15.9 m/s

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3 years ago
Which jovian planet should have the most extreme seasonal changes?
saul85 [17]

Answer:

Uranus

Explanation:

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7 0
3 years ago
When did diesel locomotives replace steam locomotives?
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To keep the energy going every day
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3 years ago
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