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3 years ago

12

Bob, Jill, Kim, and Steve measure an object's length, density, mass, and brightness, respectively. Which student must derive a u

nit of measurement?
A. Bob

B. Jill

C. Kim

D. Steve

1 answer:

netineya [11]3 years ago

3 0

The answer is A. Bob (<span>object's length)

</span>

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A net force of 20 N acting on a wooden block produces an

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Answer:

From the second law of motion:

F = ma

we are given that the force applied on the block is 20N and the block accelerates at an acceleration of 4 m/s/s

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Replacing the variables in the equation:

20 = 4* m

m = 20 / 4

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We need to find the launch velocity of our new marble launcher. we know that it will launch a 25g marble to a distance of 73 cm,

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The launch velocity of the marble launcher is 34.65 m/s

Given that the launch velocity of marble launcher, launches a 25g marble to a distance of 73 cm (0.73 m) and the marble roll up to 6.2 meters before stopping. The launch height is 20 cm (0.2 m).

The time for landing can be calculated by the second equation of motion formula:

h = ut + $\frac{1}{2}$ g $t^{2}$

Let u = 0

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$t^{2}$ = 0.04

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Speed = 34.65 m/s

Therefore, the launch velocity of the marble launcher is 34.65 m/s

Know more about Launch velocity: -brainly.com/question/18883779

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1 year ago

Visible light waves are ______ waves<br> A.mechanical <br> B.electromagnetic

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B.Electromagnetic
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If each washer has a mass of 4.9 g, then the mass of two washers in kilograms would be Given that F = ma, and if 4 washers are a

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Given that,

Mass of each washer = 4.9 g

We need to calculate the mass of two washers in kg

Using conversion of unit

Mass of each washer $m= 4.9\times10^{-3}\ Kg$

So, Mass of two washers is

$M=2\times m$

Put the value of m

$M=2\times4.9\times10^{-3}\ k$

$M=0.0098\ Kg$

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We need to calculate the applied force on the car

Using formula of force

$F=mg$

Put the value into the formula

$F=4\times4.9\times10^{-3}\times9.8$

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