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3 years ago

1. A car drives 5 miles East and 12 miles North for 10 seconds. What is the total displacement and

Physics

1 answer:

telo118 [61]3 years ago

6 0

Answer:

13m & 17m.

Explanation:

Displacement - Shortest distance between the initial and final point. Here ,

=> Displacement = √ ( 12² + 5² )

=> Displacement = √ 144 + 25

=> Displacement = √ 169

=> Displacement = 13 m

Distance - Total path length covered by the body .

=> Distance = 12m + 5m

=> Distance = 17m

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At what distance will a 80 W lightbulb have the same apparent brightness as a 120 W bulb viewed from a distance of 40 m

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Answer:

32.6mm

Explanation:

Using area of a sphere(bulb) = 4πr²

So A is proportional to radius²

So the Energy will be proportional to r²

But 120/80 = 1.5 is the energy factor so

Using

1.5/d² = 1/r²

1.5/40²= 1/r^2

r = √( 40²/ 1.5)

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3 years ago

What effect does an unbalanced force have on an object?

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<span>it either changes the direction of the object or it stops the object in motion.</span>

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3 years ago

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Ans; see attached file for calculation and answer

Explanation:

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3 years ago

At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 8.0 m above the water. One diver runs of

Alika [10]

Answer:

Number of revolutions=1.532 revolutions

Explanation:

Given data

Distance s=8.0 m

Angular speed a=1.2 rev/s

To find

Number of revolutions

Solution

From the equation of simple motion we not that

$S=ut+1/2gt^{2}\\ where\\u=0\\So\\8.0m=0+(1/2)(9.8m/s^{2} )t^{2}\\ t^{2}=\frac{8.0m}{0.5*9.8m/s^{2} } \\ t^{2}=1.63\\t=\sqrt{1.63} \\t=1.28s$

So for the number of revolutions she makes is given as

$n=a*t\\n=(1.2rev/s)(1.28s)\\n=1.532revolutions$

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3 years ago

Number 3 How to do?

Nat2105 [25]

Answer:

1 m/s

Explanation:

Impulse = Change in momentum

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(1.0)(1.0) = (1.0)(Final Velocity) - (1.0)(0)

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3 years ago