A car stopped at a red light, not moving?

Physics

1 answer:

timofeeve [1]3 years ago

5 0

I think it's a) 1st Newton's law... so sorry if it's wrong...

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A miner of mass 90kg travels down a slide calculate the potential energy of the miner when he moves15m vertically downwards

Lena [83]

Answer:

Gravitational Potential Energy = mgh

Explanation:

As the miner moves down, the GPE changes because the height changes.

Gravitational Potential Energy = mgh

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3 years ago

Parker wound a wire around a large iron nail. He then created an electromagnet by connecting the ends of the wire to different b

padilas [110]

The correct option is C.
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3 years ago

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2. Tony sets up an experiment inside his classroom. He spaces 5 plants at equal

brilliants [131]

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Explanation:

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4 years ago

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Achilles and the tortoise are having a race. The tortoise can run 1 mile (or whatever the Hellenic equivalent of this would be)

fenix001 [56]

Answer:

Surely Achilles will catch the Tortoise, in 400 seconds

Explanation:

The problem itself reduces the interval of time many times, almost reaching zero. However, if we assume the interval constant, then it is clear that in two hours Achilles already has surpassed the Tortoise (20 miles while the Tortoise only 3).

To calculate the time, we use kinematic expression for constant speed:

$x_{final}=x_{initial}+t_{tor}v_{tor}=1+t_{tor}\\x_{final}=x_{initial}+t_{ach}v_{ach}=10t_{ach}$

The moment that Achilles catch the tortoise is found by setting the same final position for both (and same time as well, since both start at the same time):

$1+t=10t\\t=1/9 hour=0.11 hours$