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stepladder [879]

3 years ago

5

For which one of the following situations will the path length equal the magnitude of the displacement? a A ball on the end of a

string is moving in a vertical circle. b A toy train is traveling around a circular track. c A train travels 5 miles east before it stops. It then travels 2 miles west. d A ball is rolling down an inclined plane. e A ball rises and falls after being thrown straight up from the earth's surface.

1 answer:

PSYCHO15rus [73]3 years ago

7 0

Answer:

d A ball is rolling down an inclined plane.

Explanation:

When path length is equal to the displacement

then we can say that the motion of the object must be in straight line so that the distance and displacement must be same

SO here we can say

a A ball on the end of a string is moving in a vertical circle.

In circular path distance and displacement is not same

b A toy train is traveling around a circular track.

In circular path distance and displacement is not same

c A train travels 5 miles east before it stops. It then travels 2 miles west.

Net displacement is 3 miles East while distance is 7 miles

d A ball is rolling down an inclined plane.

Here its motion is in straight line so we can say that path length and displacement will be same

e A ball rises and falls after being thrown straight up from the earth's surface.

In this type of to and fro motion path length is not same as displacement

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-A: Find the force that must be exerted on the rod to maintain a constant current of 0.156 A in the resistor? (In mN)

Ksenya-84 [330]

A) Force: 0.0528 N

B) Power dissipated: 0.307 W

C) Power delivered: 0.307 W

Explanation:

A)

The force experienced by a current-carrying wire in a magnetic field is given by

$F=ILB$

where

I is the current in the wire

L is the length of the wire

B is the strength of the magnetic field

In this problem, we have:

L = 0.451 m

B = 0.751 T

I = 0.156 A

Therefore, the force is

$F=(0.156)(0.451)(0.751)=0.0528 N$

B)

The rate of energy dissipation in the resistor is the power dissipated in the resistor, and it is given by

$P=I^2R$

where

I is the current in the resistor

R is the resistance

For the wire in this problem,

I = 0.156 A

$R=12.6\Omega$

Therefore, the power dissipated is

$P=(0.156)^2(12.6)=0.307 W$

C)

The mechanical power delivered to the rod is given by

$P=VI$

where

V is the potential difference across the rod

I is the current in the rod

The potential difference across the rod must be equal to the potential difference across the resistance, which can be found by using Ohm's law:

$V=RI=(12.6 \Omega)(0.156 A)=1.97 V$

Therefore, the power delivered to the rod is

$P=(1.97 V)(0.156 A)=0.307 W$

This power is equal to the power dissipated on the resistor: this is due to the law of conservation of energy, in fact the total energy must remain constant, so here the electric energy is transformed into mechanical energy of motion of the rod.

4 0

3 years ago

What are the effects of moon rotation and revolution

polet [3.4K]

Answer:

The effects of the Moon's rotation includes;

1) The Moon rotation and revolution gives the appearance of a perfectly still Moon to observers of the Moon from the Earth

2) The Moon has two sides, the near side that continuously faces the Earth and the "back" or far side, which is also known as the dark side of the Moon

The effect of the Moon's revolution

1) The tides in the ocean and water bodies, due to the gravitational forces from the Moon

2) The changes in the observed shape of the Moon due to the amount of Sunlight that is able to be reflected from the Moon as a result of the relative position of the Moon, the Earth and the Sun, at a given point in time

3) Lunar and Solar eclipse, when the Earth and the Moon blocks the light coming from the Sun respectively, due to their combined revolution

Explanation:

The duration of the Moon's orbit round the Earth = 27.322 days

The time it takes the Moon to rotate round its axis = 27 days

The Moon is the closest cosmic body to the Earth.

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miskamm [114]

Answer:

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What Could be the control in an experiment to measure the effects of gas additives on fuel

alina1380 [7]

Well,

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4 years ago