4 years ago

The effect of current electricity

Physics

1 answer:

olganol [36]4 years ago

5 0

Answer:

(3 ) friction hope this is correct

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A rock falls from a tower that is 320 feet high. As it is falling, its height is given by the formula h equals 320 minus 16 t s

RSB [31]

Answer:

a. 4.5secs

Explanation:

From the question, the equation describing the height is given by

$h(t)=320-16t^{2}\\$

at the point when the rock hit the ground, the height,h will be zero.

Hence we can have

$h(t)=320-16t^{2}\\\\at h(t)=0\\0=320-16t^{2}\\hence \\320=16t^{2}\\t^{2}=\frac{320}{16}\\ t^{2}=20\\t=\sqrt{20}\\ t=4.47secs\\t=4.5sec\\$

hence the rock will hit the ground in 4.5secs

4 0

4 years ago

Okay so I've have 10 Brainliest, through my whole time using brainly- I want people to get brainly and points so Im giving away

Nookie1986 [14]

answer:

thank youu for the points cute drawing by the way (✿◠‿◠)

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have a wonderful dayyy !!

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3 years ago

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If a cable insulation is described as RHW, you would be able to use the cable for what maximum temperature?

BartSMP [9]

167•F which is c

Tell me my wrong from right

7 0

3 years ago

Newton's law of cooling states that the rate of change of temperature of an object in a surrounding medium is proportional to th

Nastasia [14]

Answer:

$T = 40 + e^{3.68t} e^{2.99}$

Explanation:

The differential equation for given is given as

$\frac{dT}{dt} = - k(T-T_s)$

integrating above equation we have

ln(T-T_s) = -kt + C

At t = 0 , T(0) = 60

$ln(60- 40) = -k\times 0 + C$

2.99 = C

At t =1 , T(1) = 40.49887

$ln(40.49787 - 40) = -k\times 1 + 2.99$

- k = -3.687

So we have

$T- 40 = e^{3.68t + 2.99}$

$T = 40 + e^{3.68t} e^{2.99}$

4 0

3 years ago

Arightward force of 302 N is applied to a 28.6-kg crate to accelerate it across the floor. What will its acceleration be?

Musya8 [376]

Answer:

a $\approx$ 10.6 m/s²

Explanation:

Since F = ma (Force = mass * acceleration), acceleration would be...

a = F/m

a = 302 N/28.6

a $\approx$ 10.6 m/s²

8 0

3 years ago