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Olenka [21]
3 years ago
10

What is the volume of a 72 g of copper if copper has a density of 9 g/cm3

Physics
1 answer:
azamat3 years ago
6 0

Answer:

8 centimetre cube

Explanation:

because volume is equal to mass per densiry

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Answer:

6 days.

Explanation:

From radioactivity, The expression for half life is given as,

R/R' = 2⁽ᵃ/ᵇ)................... Equation 1

Where R = original mass of the radioactive substance, R' = Remaining mass of the radioactive substance after decay, a = Total time taken to decay, b = half life.

Given: R = 80 g, R' = 10 g, b = 2 days.

Substitute into equation 1

80/10 = 2⁽ᵃ/²⁾

8 = 2⁽ᵃ/²⁾

2³ = 2⁽ᵃ/²)

Equating the base and solving for a

3 = a/2

a = 2×3

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5 0
3 years ago
If only an external force can change the velocity of a body, how can the internal force of the brakes bring a car to rest? 1. It
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Answer:

4. It is the force of the road on the tires (an external force) that stops the car.

Explanation:

If there is no friction between the road and the tires, the car won't stop.

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The force of the brakes on the wheels is not what makes the car stop, it is the friction of the road against still tires that makes it stop.

3 0
3 years ago
The purpose of the defense is to _____.
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Hello,

The purpose of the defense is to <span>prevent the opposing offense from advancing the ball.

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Hope this helped!

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Benthos 

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