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3 years ago

13

What is the golden rule of lightning safety? (A.Don't stand under trees). (B.Avoid using electronics,)(C.Stay avvay from open sp

aces.) (D. Head for cover)

1 answer:

IrinaK [193]3 years ago

6 0

The answer is d (head for cover)

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Charges can be separated in an isolated system

Vesnalui [34]

Answer:

yes. can always be separated

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3 years ago

A truck traveling at a constant speed of 28 m/s passes a more slowly moving car. The instant the truck passes the car, the car b

choli [55]

Answer:

the velocity of car when it passes the truck is u = 16.33 m/s

Explanation:

given,

constant speed of truck = 28 m/s

acceleration of car = 1.2 m/s²

passes the truck in 545 m

speed of the car when it just pass the truck = ?

time taken by the truck to travel 545 m

time = $\dfrac{distance}{speed}$

time = $\dfrac{545}{28}$

time =19.46 s

velocity of the car when it crosses the truck

$S = ut + \dfrac{1}{2}at^2$

$545= u\times 19.46 + \dfrac{1}{2} \times 1.2 \times 19.46^2$

u = 16.33 m/s

the velocity of car when it passes the truck is u = 16.33 m/s

5 0

4 years ago

If the gravitational force between objects of equal mass is 2.30 x 10^‐8 N when the objects are 10.0 m apart, what is the mass o

Readme [11.4K]

Answer:

Mass of each objects, m = 185.69 kg

Explanation:

The gravitational force between two equal masses is, $F=2.3\times 10^{-8}\ N$

Separation between the masses, d = 10 m

Let m is the mass of each object. The gravitational force is given by :

$F=G\dfrac{m^2}{d^2}$

$m=\sqrt{\dfrac{F.d^2}{G}}$

$m=\sqrt{\dfrac{2.3\times 10^{-8}\times (10)^2}{6.67\times 10^{-11}}}$

m = 185.69 kg

So, the mass of each objects is 185.69 kg. Hence, this is the required solution.

6 0

3 years ago

The sides of a square increase in length at a rate of 3 m/sec. a. At what rate is the area of the square changing when the side

maks197457 [2]

The area of a square is given by:

A = s²

A is the square's area

s is the length of one of the square's sides

Let us take the derivative of both sides of the equation with respect to time t in order to determine a formula for finding the rate of change of the square's area over time:

d[A]/dt = d[s²]/dt

The chain rule says to take the derivative of s² with respect to s then multiply the result by ds/dt

dA/dt = 2s(ds/dt)

A) Given values:

s = 14m

ds/dt = 3m/s

Plug in these values and solve for dA/dt:

dA/dt = 2(14)(3)

dA/dt = 84m²/s

B) Given values:

s = 25m

ds/dt = 3m/s

Plug in these values and solve for dA/dt:

dA/dt = 2(25)(3)

dA/dt = 150m²/s

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3 years ago

A boat at rest on the ocean moves up and down as water waves pass beneath it. What can be concluded about the nature of the wate

Tema [17]

The nature of the wave is a sinusoidaly varying wave.. the each particle of the wave moves up and down.. in the phase

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4 years ago

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