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bixtya [17]
4 years ago
14

When connected to a battery, a lightbulb glows brightly. If the battery is reversed and reconnected to the bulb, the bulb will g

low
brighter.
dimmer.
with the same brightness.
not at all.
Physics
1 answer:
BartSMP [9]4 years ago
5 0
If the battery is reversed and reconnected to the bulb, the bulb will glow <span>with the same brightness. The correct option among all the options that are given in the question is the third option or the penultimate option. I hope that this is the answer that you were looking for and it has actually come to your help.</span>
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A block is at rest on the incline shown in the gure. The coefficients of static and kinetic friction are 0.6 and 0.51, respec- t
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Normal reaction force on the block while it is at rest on the inclined plane is given as

F_n = mgcos\theta

here we know that

m = 46 kg

\theta = 29^o

now we will have

F_n = 46*9.8*cos29 = 394.3 N

now the limiting friction or maximum value of static friction on the block will be given as

F_s = \mu_s * F_n

F_s = 0.6 * 394.3 = 236.56 N

Above value is the maximum value of force at which block will not slide

Now the weight of the block which is parallel to inclined plane is given as

F_{||} = mg sin\theta

here we know that

F_{||} = 46*9.8 sin29 = 218.55 N

Now since the weight of the block here is less than the value of limiting friction force and also the block is at rest then the frictional force on the block is static friction and it will just counter balance the weight of the block along the inclined plane.

So here <u>friction force on the given block will be same as its component on weight which is 218.55 N</u>

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3 years ago
A small pebble and one large boulder start at the same height and begin rolling down the side of a mountain. Which object would
vitfil [10]

Answer:

The small pebble

Explanation:

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K.E ∝ m

So, the kinetic energy of the object is directly proportional to its mass. Thus, the object with the smaller mass has the lesser kinetic energy.

Since the object with the smaller mass is the small pebble, so the small pebble would have less kinetic energy as it crashes on the road at the bottom of the mountain.

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The anser is b

Explanation:

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