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QveST [7]
3 years ago
6

If a force does a positive amount of work on an object, does the object’s speed increase, decrease, or remain the same? Justify

your answer.
Physics
1 answer:
iris [78.8K]3 years ago
6 0

Answer:

see that there is no dependence on speed, so the work remains constant

Explanation:

Work is defined by the expression

        W = F. d

where the boldface indicates vectors, this equation can be written in scalar form

         W = f d cos θ

where θ is the angle between force and displacement.

We see that there is no dependence on speed, so the work remains constant

The power is

           P = W / t

           P = f d / t

           p = F v

we see that the power is the one that depends on the speed of the body

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luda_lava [24]
It is the mitochondria of a cell that stores energy for a quick release. <span>Mitochondria break down glucose to release the energy for cells to use. Hope this answers the question. Have a nice day. Feel free to ask more questions.</span>
5 0
3 years ago
A small fan has blades that have a radius of 0.0600 m. When the fan is turned on, the tips of the blades have a tangential accel
zhuklara [117]

Answer:

α = 395 rad/s²

Explanation:

Main features of uniformly accelerated circular motion

A body performs a uniformly accelerated circular motion   when its trajectory is a circle and its angular acceleration is constant  (α = cte). In it the velocity vector is tangent at each point to the trajectory and, in addition, its magnitude varies uniformly.

There is tangential acceleration (at) and is constant.

at = α*R     Formula (1)

where

α  is the angular acceleration

R is the radius of the circular path

There is normal or centripetal acceleration that determines the change in direction of the velocity vector.

Data

R = 0.0600 m   :blade radius

at = 23.7 m/s² : tangential acceleration of the blades

Angular acceleration of the blades (α)

We replace data in the formula (1)

at = α*R  

23.7 = α*(0.06)

α = (23.7) / (0.06)

α = 395 rad/s²

7 0
3 years ago
The speedometer on a car actually measures the rotational speed of the axle and converts that to the linear speed of the car, as
Studentka2010 [4]
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8 0
3 years ago
Read 2 more answers
In a circuit, a variable resistor is to be connected across a potential difference of 60 volts to allow the current to be adjust
sweet [91]

Answer:

600 and 1500 [ohm

Explanation:

To solve this problem we must use ohm's law, which tells us that the voltage is the product of the current by the resistance, so we have:

V = I*R

where:

V = voltage [V]

I = current [amp]

R = resistance [ohm]

<u>Therefore:</u>

R = V/I

R1 = 60/(40*10^-3) = 1500 [ohm]

R2 = 60/(100*10^-3) = 600 [ohm]

So the resistance should be among 600 and 1500 [ohm]

4 0
3 years ago
When power and current are known use R = P/I^2 to calculate the resistance.
inna [77]

<h2>\bf{ \underline{Given:- }}</h2>

\sf• \: Power \:( P) = 300  \: watts

\sf• \:  Current \: (I) = 30 \: amps

\\

<h2>\bf{ \underline{To \:  Find:- }}</h2>

\sf• \: The  \: Resistance

\\

\huge\bf{ \underline{Solution :-:- }}

\bf \red {\bigstar{ Formula  \: of \:  Power \: (P) =  \frac{ {I}^{2} }{R}}}

\sf \rightarrow 300= \frac{ {30}^{2} }{ R}

\sf \rightarrow 300 =  \frac{900}{ R}

\rightarrow \sf R = \frac{300}{900}

\rightarrow \sf R =  \frac{1}{3}

\rightarrow \sf R =  0.33

\bf \purple{Hence, \:  the  \: resistance  \: is \:  0.33 \:  Ω \: . }

7 0
3 years ago
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