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RideAnS [48]
4 years ago
8

If the force applied to an object remains constant, is more power needed for the object to move faster ? Explain

Physics
1 answer:
vazorg [7]4 years ago
8 0

Answer:

Yes

Explanation:

The power is defined as the work done (W) per unit of time (t):

P=\frac{W}{t}

this can be rewritten in another way: keeping in mind that the work is the product of force (F) and displacement (d): W=Fd and that the ratio between displacement (d) and time (t) is the velocity: v=\frac{d}{t}, we can rewrite the equation above as

P=\frac{Fd}{t}=F\frac{d}{t}=F\cdot v

So, the power is the product of force and velocity: therefore, if the force applied to an object is constant, we see that if we want to increase the velocity (v) we also need to use more power (P), because from the formula we see that P and v are directly proportional to each other.


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The bellow of a territorial bull hippopotamus is measured at 100 dB above the threshold of hearing. What is the sound intensity?
Dmitriy789 [7]

Answer:

Explanation:

The hippopotamus hearing threshold is 100dB

β = 100 dB

The threshold of human hearing is Io = 1 × 10^-12 W/m²

The sound intensity level is given as

β = 10•Log(I / Io)

100 = 10•Log(I / Io)

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100 / 10 = Log(I / Io)

10 = Log(I / Io)

Take inverse Logarithm ( antilog) of both sides

10^10 = 10^[Log(I / Io)]

10^10 = I / Io

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I = 10^10 × Io

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3 years ago
A runner accelerated to 4 m/s^2 for 20 seconds before winning the race.How far did he/she run?
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Answer:

s=800 m

Explanation:

Given that,

Acceleration of a runner, a = 4 m/s²

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Herre, u = 0

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4 years ago
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