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3 years ago

What does a measured number tell you?

Physics

1 answer:

oksano4ka [1.4K]3 years ago

5 0

Answer:

The precision at which the number was measured

Explanation:

The number of digits that you use to record a measurement indicates the precision of the measurement.

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What can electromagnetic waves travel through?

Kisachek [45]

Electromagnetic waves do not require a medium to travel through. They can travel through empty space or matter.

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2 years ago

If a 15 kg mass accelerates at a rate of 4 m/s2, what net force acts on it?

jarptica [38.1K]

<h2>Answer: D 60N</h2>

<h3>Explanation:</h3>

Mass(M)=15 kg

Acceleration(A)=4 m/s2

Force=?

Now,

Force(F)=M×A

F=15×4

F=60N Ans

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2 years ago

A student standing on a stationary skateboard tosses a textbook with a mass of mb = 1.25 kg to a friend standing in front of him

juin [17]

Answer:

The velocity of the student has after throwing the book is 0.0345 m/s.

Explanation:

Given that,

Mass of book =1.25 kg

Combined mass = 112 kg

Velocity of book = 3.61 m/s

Angle = 31°

We need to calculate the magnitude of the velocity of the student has after throwing the book

Using conservation of momentum along horizontal direction

$m_{b}v_{b}\cos\theta= m_{c}v_{c}$

$v_{s}=\dfrac{m_{b}v_{b}\cos\theta}{m_{c}}$

Put the value into the formula

$v_{c}=\dfrac{1.25\times3.61\times\cos31}{112}$

$v_{c}=0.0345\ m/s$

Hence, The velocity of the student has after throwing the book is 0.0345 m/s.

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2 years ago

Applications of pressure

Sunny_sXe [5.5K]

hydraulic press
hydraulic lift
hydraulic jack
hydraulic brake

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1 year ago

Describe the magnetic field lines around a bar magnet

Sophie [7]

The lines can be traced out with a compass. The needle is like a permanent magnet and the north indicator is the north end of a magnet.

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2 years ago

Read 2 more answers