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nirvana33 [79]
3 years ago
12

If Siobhan hits a 0.25 kg volleyball with 0.5 N of force, what is the acceleration of the ball?

Physics
2 answers:
Alekssandra [29.7K]3 years ago
8 0

Answer:

2 meters per second²

Explanation:

PilotLPTM [1.2K]3 years ago
7 0

Answer:2m/s^2

Explanation:

mass=0.25kg

Force =0.5N

Acceleration=force/ mass

Acceleration=0.5/0.25

Acceleration=2

Acceleration =2m/s^2

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the pilot of a new stealth helicopter which has a mass of 15000 kg and was traveling 180 m / s accelerated to 250 m / s in six s
MariettaO [177]

Answer:

<em>pf = 3750000 kg.m/s</em>

<em>F = 175000 N</em>

Explanation:

<u>Constant Acceleration</u>

An object moves with constant acceleration if its velocity changes uniformly in time.

If we call vo to the initial speed, vf the final speed, and t the time, then the acceleration is calculated as:

\displaystyle a=\frac{v_f-v_o}{t}

The new stealth helicopter was traveling at vo=180m/s and changed to vf=250 m/s in t=6 seconds, thus the acceleration was:

\displaystyle a=\frac{250-180}{6}

a=11.67~m/s^2

<em>Please note this number is shown rounded to the nearest hundredth, but it was stored in the calculator's memory with full precision. This fact affects the next calculation as will be noted below.</em>

The acceleration must be produced for some net force that can be calculated by:

F = m.a

Where m=15000 Kg is the mass of the helicopter. Thus:

F = 15000 * 11.67

F = 175000 N

<em>The above product would lead to the inaccurate result of 175050 if the acceleration would have not used with its full representation in the calculator's memory.</em>

The momentum of an object of mass m and velocity v is:

p = m. v

The final momentum of the helicopter is:

pf = m.vf = 15000*250 m/s

pf = 3750000 kg.m/s

<u>Note: When performing calculations over intermediate results, it's important to keep them as accurate as possible to preserve the accuracy of the final result.</u>

6 0
3 years ago
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liubo4ka [24]
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Suppose you are in an elevator. As the elevator starts upward, its speed will increase. During this time when the elevator is mo
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Answer: The answer is A.

Explanation:

Suppose you are in an elevator. As the elevator starts upward, its speed will increase. During this time when the elevator is moving upward with increasing speed, your weight will be greater than your normal weight at rest.

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How many protons are in the radioactive isotope 40/19K?
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What percentage of all traffic deaths occur in cars traveling less than 60 mph?
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