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3 years ago

5

Why is Vy negative and not positive because I solved it and it resulted in a positive number?

1 answer:

11Alexandr11 [23.1K]3 years ago

8 0

Explanation:

You are given the initial velocity, the displacement, and the acceleration. You're looking for the final velocity. So you use the equation:

v² = v₀² + 2aΔy

When you solve for v, you take the square root. Your calculator will return a positive answer, but there are actually two possible answers: positive and negative.

v = ±√(v₀² + 2aΔy)

You must use the physical context of the problem. If we take up to be the positive direction, then v must be negative, since the projectile is moving down.

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Answer:

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Explanation:

The total of the three charges is ...

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Assuming the charge is equally distributed between the balls when they are brought in contact, the charge on each ball will be ...

(9/3)×10^-12 C = 3×10^-12 C

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3 years ago

7. A scientist studying a squid observes that the squid at rest

Rzqust [24]

The average force on the squid during the ejection of 0.60 kg of water at a velocity of 15.0 m/s in 0.15 seconds is 60 N.

We can calculate the average force with the average acceleration as follows:

$F = m\overline{a}$ (1)

Where:

m: is the mass of water = 0.60 kg

$\overline{a}$ : is the average acceleration

The <em>average acceleration</em> is given by the change of velocity in an interval of time

$\overline{a} = \frac{v_{f} - v_{i}}{t_{f} - t_{i}}$ (2)

Where:

$v_{i}$ : is the initial velocity = 0 (the squid is at rest)

$v_{f}$ : is the final velocity = 15.0 m/s

$t_{i}$ : is the initial time = 0

$t_{f}$ : is the final time = 0.15 s

Now we can find the <em>average force</em> after entering equation (2) into (1)

$F = m(\frac{v_{f} - v_{i}}{t_{f} - t_{i}}) = 0.60 kg(\frac{15.0 m/s - 0}{0.15 s}) = 60 N$

Therefore, the average force on the squid during the propulsion is 60 N.

Find more about average force here:

brainly.com/question/20902034

brainly.com/question/12916904

I hope it helps you!

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Answer:

Explanation:

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