3 years ago

Which watch is used by scientists for correct measurement of time?

Physics

2 answers:

timurjin [86]3 years ago

3 0

Answer:

It’s the atomic clock

Explanation:

yulyashka [42]3 years ago

3 0

Atomic Watch, the third choice

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A small, solid cylinder with mass = 20 kg and radius = 0.10 m starts from rest and rotates without friction about a fixed axis t

Mice21 [21]

Answer:

Explanation:

angular acceleration α = 5 rad /s ²

θ = 1/2 α t² , θ is angle of rotation , t is time .

= .5 x 5 x 4²

= 40 rad .

θ = l / r , θ is angle formed , l is length unwound , r is radius o wheel .

l = θ x r

= 40 x .1

= 4 m .

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3 years ago

Which instrument is used to compare the mass of an object

Vladimir [108]

Answer:

A) a balance

Explanation:

The balance compares an object with a known mass to the object in question. Different types of balances include digital scientific balances and beam balances, such as a triple beam balance.

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3 years ago

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Firlakuza [10]

Answer:

First Reaction:

$^{234}U$ => $^{230} Th + ^{4}He$

Second Reaction:

$^{230} Th$ => $^{226} Ra + ^{4}He$

Combined Reaction:

$^{234} U$ => $^{226}Ra + 2( ^{4} He)$

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3 years ago

An ice skater accelerates backwards for 5.0 seconds to a final speed of 12 m/s. If the acceleration backwards was at a rate of 1

Lostsunrise [7]

Answer:

Vo = 4.5 [m/s]

Explanation:

In order to solve this problem, we must use the following equation of kinematics.

$v_{f}=v_{o}+a*t$

where:

Vf = final velocity = 12 [m/s]

Vo = initial velocity [m/s]

a = acceleration = 1.5 [m/s²]

t = time = 5 [s]

Now replacing:

$12=v_{o}+1.5*5\\v_{o}=12- (7.5)\\v_{o}= 4.5[m/s]$

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When the sun heats up the surface of a puddle of water

nika2105 [10]

The puddle evaporates

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3 years ago