3 years ago

In what scenario might a red ball appear black?

Physics

1 answer:

zhuklara [117]3 years ago

3 0

A scenario a red ball might appear black is when there is a shadow in front of it.or when the ball is in a dark place.

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Why do you ask me that’s all me the moon seem like they’re walking on Spring tomorrow on earth we are from your tractor to the g

nataly862011 [7]

The moon is talking to thecat at night that’s why

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2 years ago

A 25 kg child runs at a speed of 5.0 m/s and jumps onto a stationary shopping cart and holds on for dear life. The cart has mass

makkiz [27]

Answer:

3.38 m/s

Explanation:

Mass of child = m₁ = 25

Initial speed of child = u₁ = 5 m/s

Initial speed of cart = u₂ = 0 m/s

Mass of cart = m₂ = 12 kg

Velocity of cart with child on top = v

This is a case of perfectly inelastic collision

$m_1u_1+m_2u_2=(m_1+m_2)v\\\Rightarrow v=\frac{m_1u_1+m_2u_2}{m_1+m_2}\\\Rightarrow v=\frac{25\times 5+12\times 0}{25+12}\\\Rightarrow v=\frac{125}{37}\\\Rightarrow v=3.38\ m/s$

Velocity of cart with child on top is 3.38 m/s

7 0

2 years ago

If the temperature of the conductor is increased, the electrons’ speeds decrease

Tatiana [17]

Answer:

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Explanation:

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5 0

2 years ago

3. Imagine a 10kg block moving with a speed of 20m/s<br> calculate the kinetic energy of this block

MatroZZZ [7]

The formula of the kinetic energy is:
$E_{k} = \frac{m v^{2} }{2}$
where m is a mass of the object, v is speed of the object at the moment of time. So we have:
$E_{k} = \frac{10* 20^{2} }{2} = 2000J$
The answer is 2000 Joules.

6 0

2 years ago

A total of 750 j of work was done when a force of 125 n was exerted on a box to move it. how far was the box moved?

Slav-nsk [51]

Work = Force times Distance
W = Fd

Given W = 750J, F = 125N;

750 = 125d

Solving for d:
d = 750/125
d = 6

The box moved a distance of 6 meters.

3 0

2 years ago