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Nady [450]
3 years ago
12

A physics student is riding on a train traveling north. Having read about inertia, the student performs an experiment with a gol

f ball. He reaches over the aisle and drops the ball from rest. Instead of hitting the floor directly below the student’s hand, it hits to the north, i.e., forward of that position. Which of the following might be the cause for this to happen?
(A) The train is moving at constant
(B) The train is speeding up. veloeity
(C) The train is slowing down.
(D) Whatever the cause, it cannot be any of the answers given.
Physics
1 answer:
mario62 [17]3 years ago
5 0

Answer:

(C) The train is slowing down.

Explanation:

Since the ball seems to move <em>forward, </em>the train is slowing down. This is because Newton's 1st Law, objects inside the train tend to keep their previous state of movement, that is, the velocity before the train start slowing down, thus appearing to move forward in relation with the train itself.

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Serga [27]

Answer:

Efficiency = 5%

Explanation:

Given that,

Supplies energy to the bulb = 100 J

Transferred energy by the bulb = 5 J

We need to find the efficiency of the bulb. It can be given by "

\eta=\dfrac{\text{useful energy out}}{\text{useful energy in}}\times 100\\\\=\dfrac{5}{100}\times 100\\\\=5\%

So, the efficiency of the bulb is 5%.

8 0
3 years ago
Explain briefly where the energy come from when a liquid Rises against Gravity in a capillary tube​
SSSSS [86.1K]

Answer:

Surface tension

Explanation:

When liquid rises against gravity in a capillary tube, the energy comes from surface tension.

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The liquid will be in contact with the capillary tube and as such experiences surface tension which in turn makes the capillary tube to experience an upward force that makes the liquid begin to rise up.

The more the liquid keeps rising, the more it gets to the point where the surface tension becomes balanced from the weight of the liquid.

3 0
3 years ago
What type of consumer is a cat
Scilla [17]
A Cat is a secondary source 
5 0
4 years ago
Read 2 more answers
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Strike441 [17]
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8 0
3 years ago
A U-shaped tube open to the air at both ends contains water. A quantity of oil of unknown density is slowly poured into the righ
nadezda [96]

Answer:

\rho_o=600\ kg.m^{-3} is the density of the oil

Explanation:

Given:

  • height of oil column, h_o=20\ cm
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<u>Now from the given it is clear that the height of water column is:</u>

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8 0
4 years ago
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