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zubka84 [21]
3 years ago
15

A good model of the solar system to present to elementary is the Ptolemaic model.

Physics
1 answer:
Anvisha [2.4K]3 years ago
6 0

The answer is:

B. false

Here's why:

The Ptolemaic model is not accurate and this is because the model is geocentric. This means that this model was developed with the assumption  that the Earth was the center of the universe and the sun and the planets revolved around it. Science has already proven that this is not true.

This model was developed by Claudius Ptolemy.

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With what minimum speed must you toss a 200 g ball straight up to just touch the 15-m-high roof of the gymnasium if you release
victus00 [196]
Total energy before the toss:
E_1 = \frac{1}{2} mv_1^2 + mgh_1

Total energy at the roof:
 E_2 = \frac{1}{2} mv_2^2 + mgh_2

Energy must be conserved so :
E_1 = E_2 \\ \\ \frac{1}{2} mv_1^2 + mgh_1 = \frac{1}{2} mv_2^2 + mgh_2 \\ \\ \frac{1}{2} m (v_1^2 - v_2^2) = mg(h_2 - h_1) \\ \\ \frac{1}{2} (v_1^2 - v_2^2) = g(h_2 - h_1) \\ \\ v_1^2 - v_2^2 = 2g(h_2 - h_1)

If v₁ is the initial velocity and v₂ is the final velocity, which is zero at the roof:
v_1^2 = 2g(h_2 - h_1) \\  \\ v_1 =  \sqrt{2g(h_2 - h_1)}

v_1 =  \sqrt{(2)(9.81 \frac{m}{s^2} )(15m - 1.6m)} = 16,2  \frac{m}{s}

4 0
4 years ago
PLEASE HELP ME!<br> help on this cross word puzzle PLEASE!<br> 17 POINTS FOR HELPING THANKS!
Dmitriy789 [7]
16 across=freezing
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5 0
3 years ago
Read 2 more answers
If humans evolved from apes or chimps, why are the chimps and apes still here?
zavuch27 [327]

Answer:

Chimps and apes are still here because humans did not evolve from all apes and chimps.

Explanation:

5 0
3 years ago
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During a baseball game a pitcher threw a baseball, and the catcher, who was behind home plate, caught it. Which is true about th
shtirl [24]

Answer:

If the pitcher catches the ball after it has been hit by the hitter, but before it touches the ground, the hitter is out, and, if there are not yet three outs but there is a runner on the bases, the pitcher can try to get a second (or third) out by throwing the ball to the appropriate baseman.

Explanation:

The catcher plays behind home plate in a baseball . The catcher plays an important role in baseball game.  He is the main part of the battery with the pitcher. The catcher catches the pitches and help to call the game.

Catcher is the Best Baseball Position.

First Base is the Best Baseball Position.

Second Base is the Best Baseball Position.

Third Base is the Best Baseball Position:

Shortstop is the Best Baseball Position.

Right Field is the Best Baseball Position.

7 0
4 years ago
An object with a mass of 70 kilograms is supported at a height of 8 meters above the ground, what's the potential energy of the
Olegator [25]

Answer:

5488 Joules

Explanation:

Use the formula for the potential energy:

E_p = mgh = 70kg\cdot 9.8\frac{m}{s^2}\cdot 8m = 5488 J

6 0
3 years ago
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