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3 years ago

12

How could you mathematically estimate the maximum height you can throw a ball vertically upward? How would you estimate the max

imum speed you could give it?

1 answer:

ELEN [110]3 years ago

7 0

Answer:

1) Throw the ball straight in the air and time how long it takes the ball to travel out of your hand then back into your hand at the same height it was released at.

2) Use this time and divide it by two to get t1. Insert t1 into the formula y=(g(t1)^2)/2. Solve for y.

3) To find the maximum speed you take t1 and insert it into the formula Vy=G(t1) and solve for Vy.

4) Remember to ignore air resistance and that g=9.8 m/(s^2)

Explanation:

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What causes the marks on the moons surface?

Dovator [93]

Mountains, valleys, plains, piles of rocks, and craters do.

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3 years ago

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Which of the following determines whether light shining on a metal surface will eject electrons from that surface?

PtichkaEL [24]

From that list, only the frequency makes the difference.

Einstein won his only Nobel Prize for his explanation of this effect.

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4 years ago

As a dilligent physics student, you carry out physics experiments at every opportunity. At this opportunity, you carry a 1.11-m-

soldier1979 [14.2K]

Answer:

The strength of the magnetic field is 0.0842 mT

Explanation:

Given:

Velocity of rod $v = 3.07$ $\frac{m}{s}$

Length of rod $l = 1.11$ m

Induced emf across the rod $\epsilon = 0.287 \times 10^{-3}$ V

According to the faraday's law

We have a special case for moving rod in magnetic field.

Induced emf in moving rod is given by,

$\epsilon = Blv$

Where $B =$ strength of magnetic field

$B = \frac{\epsilon}{lv}$

$B = \frac{0.287 \times 10^{-3} }{3.07 \times 1.11}$

$B = 0.0842 \times 10^{-3}$ T

$B = 0.0842$ mT

Therefore, the strength of the magnetic field is 0.0842 mT

7 0

3 years ago

Upon examining layer M, you find that it contains a small proportion of the radioactive isotope - Potassium-40, which decays int

Westkost [7]

Answer:

t = 2.6 billion years

Explanation:

If potassium becomes 25% of its initial value

so we can say it becomes half two times

as we know that 25% means it is 1/4 times of initial value

so we will have

$N = N_o e^{-\lambda t}$

here we know that

$N = 0.25 N_o$

$0.25 = e^{-\lmabda t}$

$ln 4 = (\frac{ln 2}{T_{1/2}}) t$

$t = 2 T_{1/2}$

$t = 2(1.3 billion \: years)$

t = 2.6 billion years

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3 years ago

The gravitational force of the Earth pulls down on a stone after someone tosses it off a cliff According to Newton's third law,

katrin [286]

Answer:

The correct answer is c.) the force of the stone's gravity pulling up on Earth.

Explanation:

The correct answer is c.) the force of the stone's gravity pulling up on Earth.

The Earth's size is much greater than size of the stone.

From Newton's Third Law that the force with the Earth attracts the stone is the same as the force of gravitational attraction that the stone exerts on Earth.

Let $m_1$ be the mass of Earth and $m_2$ be the mass of the stone.

Therefore F = $m_1 \times a_1$ = $m_2 \times a_2$ where it is known that $m_1 >> m_2$ which implies that $a_2 >> a_1$ .

The acceleration of the stone towards the Earth is much greater than the acceleration of the Earth towards the stone, and so the stone falling towards the Earth is actually visible and perceptible.

8 0

3 years ago