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charle [14.2K]
2 years ago
5

A diver jumps from a high platform and stays in the air for 1 second. How high was the platform?

Physics
1 answer:
ivolga24 [154]2 years ago
6 0

Answer: Depends

Explanation:

Depends on how much the diver weighs.

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In __________ waves, the motion of the particles in a medium is across the direction of the wave (perpendicular).
Alex_Xolod [135]
In longitudinal waves, the motion of the particles in a medium is across the direction of the wave.
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A wooden rod of negligible mass and length 80.0cm is pivoted about a horizontal axis through its center. A white rat with mass 0
algol13

Answer:

The speed of the animals is 1.64m/s.

Explanation:

Let us work with variables and call the mass of the two rats m_1 and m_2,  and the length of the rod L.

Using the law of conservation of energy, which says the potential energies of the rats must equal their kinetic energies, we know that when the rod swings to the vertical position,

$m_1\frac{L}{2}g -m_2\frac{L}{2}g = \frac{1}{2}m_1v^2+\frac{1}{2}m_2v^2$

$(m_1 -m_2)g\frac{L}{2} = \frac{1}{2}(m_1+m_2)v^2$,

solving for v, we get:

$\boxed{v = \sqrt{\frac{(m_1 -m_2)gL}{(m_1+m_2)}} }$

Putting in the values for m_1, m_2, g, and L we get:

$v = \sqrt{\frac{(0.450kg -0.220kg)(9.8m/s^2)(0.8m)}{(0.450kg+0.220kg)}} $

\boxed{ v= 1.64m/s}

Therefore, as the rod swings through the vertical position , the speed of the rats is 1.64 m/s.

7 0
3 years ago
How can electric energy be converted to heat energy?
Goshia [24]
To do that, you must pass electric current through a substance
that electrons have to spend energy to pass through. 
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The amount of heat that appears when current flows through it
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A few examples of things used for that purpose:

-- resistors
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-- electric clothes iron
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D. A magnetic field created by the electric current causes the compass needle to move.
6 0
3 years ago
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Find the potential energy of a 2 kg ball 15 m in the air.
mart [117]

Answer:

294.3 Joules

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