4 years ago

A book on a 2 meter high shelf has 20 Joules of potential energy.

Physics

1 answer:

Sever21 [200]4 years ago

4 0

Mass of this book is 1 kg.

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It takes about 20 seconds for a jet plane to go from rest to the takeoff speed of 100 mph (44.7 m/s). What is the average horizo

Ksju [112]

Answer:

Correct answer: F = 214.56 N

Explanation:

Given:

V₀ = 0 m/s initial speed

V = 44.7 m/s speed after t = 29 seconds

m = 96 kg

F = ? horizontal force

Taking off an airplane is a uniformly accelerated motion to which the formula applies:

V = V₀ + a t and V₀ = 0 m/s

V = a t ⇒ a = V / t = 44.7 / 20 = 2.235 m/s²

a = 2.235 m/s²

the horizontal force is calculated using the formula:

F = m · a = 96 · 2.235 = 214.56 N

F = 214.56 N

God is with you!!!

4 0

4 years ago

There are four charges, each with a magnitude of 2.06 µC. Two are positive and two are negative. The charges are fixed to the co

mars1129 [50]

Answer:

0.208 N

Explanation:

We are given that

$q_1=q_2=2.06\mu C=2.06\times 10^{-6} C$

$q_3=q_4=-2.06\mu C=-2.06\times 10^{-6} C$

Distance,d=0.41 m

The magnitude of the net electrostatic force experienced by any charge at point 4

Net force, $F_{net}=\sqrt{F^2_1+F^2_3+2F_1F_3cos90^{\circ}}-F_2$

$F_1=F_3=F$

$F_{net}=\sqrt{F^2+F^2+0}-F_2$

$F_{net}=\sqrt 2F-F_2$

$F=\frac{kq^2}{d^2}$

$F_2=\frac{Kq^2}{2d^2}$

$F_{net}=\frac{\sqrt 2kq^2}{d^2}-\frac{kq^2}{2d^2}=\frac{kq^2}{d^2}(\sqrt 2-\frac{1}{2})$

Where $k=9\times 10^9$

$F_{net}=\frac{9\times 10^9\times (2.06\times 10^{-6})^2}{(0.41)^2}(\sqrt 2-\frac{1}{2})$

$F_{net}=0.208 N$

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3 years ago

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klasskru [66]

That could be a symptom but I recommend going to your doctor just to be on the safe side!

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3 years ago

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39.Explain the working mechanism of a mercury barometer.

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3 years ago

A rock thrown with a horizontal velocity of 20m/s from a cliff that is 125m above level ground. If air resistance is negligible,

Alexxandr [17]

Answer: c

Explanation: 125/20 =6.25

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3 years ago