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AysviL [449]
3 years ago
15

Why aren’t descriptive investigations repeatable

Physics
1 answer:
zzz [600]3 years ago
8 0
It involves questions but it doesn't involve hypothesis. So we are still trying to find info by asking the question, and it's also a waste of time asking the question over and over, because the hypothesis wasn't formulated yet so that's why they are not repeatable.

Hope this helps!
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A 1500 kg car decelerates from an initial velocity of 19 m/s to a skidding stop. If the coefficient of kinetic friction is 0.100
Stella [2.4K]

Answer:

19.4 seconds

Explanation:

We have:

m: mass of the car = 1500 kg

v₀: is the initial speed = 19 m/s    

v_{f}: is the final speed = 0 (it stops)

\mu_{k}: is the coefficient of kinetic friction = 0.100

First, we need to find the acceleration by using the second Newton's law:

\Epsilon F = ma              

-\mu_{k}N = ma

-\mu_{k}mg = ma

Solving for a:

a = -\mu_{k}g = -0.1*9.81 m/s^{2} = -0.981 m/s^{2}

Now we can find the time until it stops:

v_{f} = v_{0} + at

Solving for t:

t = \frac{v_{f} - v_{0}}{a} = \frac{-(19 m/s)}{-0.981 m/s^{2})} = 19.4 s

 

Therefore, the time until it stops is 19.4 seconds.

I hope it helps you!                                            

7 0
3 years ago
What do you call rocxs that form under intense heat and pressure
kirill [66]

Metamorphic

Metamorphic rocks are formed under the surface of the earth from the metamorphosis (change) that occurs due to intense heat and pressure (squeezing).

5 0
3 years ago
They preserve many good__for us(from history of nepal)​
vampirchik [111]

Answer:

They preserve many good_from historyof nepal_for us(from history of nepal)

6 0
3 years ago
What are wind names according to direction
Vsevolod [243]

North, East, South, West (in order)

8 0
3 years ago
what of instead of other forms of energy we use sound energy to power every thing since sound is there every where
Bad White [126]

So is light, but we don't use light either to power anything, even though we do know how to capture them and extract their energy.

The reason we don't use sound or light as sources of energy is because the amount of energy in the sound and light that surrounds us is pitifully small ... in the milliwatts or microwatts, whereas the things we build and operate with oil or electricity need watts or kilowatts to function.

1 watt of sound will drive you out of the room and wake the neighbors, and 1 watt of light ... if it all enters your eye ... can permanently damage your sight.

4 0
3 years ago
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