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3 years ago

Calculate the force needed to bring a 1,019-kg car to rest from a speed of 29 m/s in a distance of 118 m

1 answer:

8 0

Acceleration = ▵v/▵t
Time = d/v
Fisrt calculate time : ( 118/29 ) = 4 seconds
Then calculate acceleration
A = 29/4 = 7.25 m/s²
Now the force.
Force = mass * acceleration.
F= 1,019 * 7.25
F= 7,387 N

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3 years ago

Light of wavelength 436.1 nm falls on two slits spaced 0.31 mm apart. What is the required distance from the slits to the screen

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Answer:

The correct answer is "4.26 m".

Explanation:

Given:

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$\lambda = 436.1 \ nm$

or,

$=436.1\times 10^{-9} \ m$

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$d = 0.31 \ mm$

or,

$=0.31\times 10^{-3} \ m$

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As we know,

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or,

⇒ $L=\frac{d(y_2-y_1)}{\lambda}$

By substituting the values, we get

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3 years ago

How do you work out instantaneous speed?

Alik [6]

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3 years ago

Light travels at the speed of approximately 3.0 × 108 meters per second. Find the time in minutes required for light to travel f

Solnce55 [7]

Answer:

t = 8.33 minutes

Explanation:

given,

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time taken to reach earth = ?

we know,

Distance = speed x time

$t = \dfrac{d}{s}$

$t = \dfrac{1.5\times 10^{11}}{3\times 10^8}$

t = 500 s

1 min = 60 s

now, $t = \dfrac{500}{60}\ minutes$

t = 8.33 minutes

time taken by the light to reach earth is equal to 8.33 minutes.

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3 years ago