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2 years ago

Four compasses are placed around a wire, as shown. What is the best conclusion that can be drawn?

Physics

2 answers:

Usimov [2.4K]2 years ago

5 0

The best conclusion that can be drawn is that D) A current does not flow in the wire

Sati [7]2 years ago

5 0

Answer: The correct answer is (D).

Explanation:

If the current is flowing in the wire then the compass shows the deflection due to the magnetic field around the current flowing wire.

In the given problem, four compasses are placed around a wire, as shown in the given figure. The compass is not showing any deflection. It means that there is no magnetic field around the wire. It can be concluded that the current is not flowing in the wire.

Therefore, the correct option is "A current does not flow in the wire".

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A 2578-kg van runs into the back of a 825-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with

allochka39001 [22]

Answer:

The initial speed of the car = 11.22 m/s

Explanation:

Law of conservation of energy: It states that when two bodied collide in a closed system, the sum of momentum before collision is equal to the sum of momentum after collision.

Note: A close system is one that is free from from external forces. E.g Frictional force.

From the law of conservation of momentum,

Total momentum before collision = Total momentum after collision.

m₁u₁ + m₂u₂ = (m₁ + m₂)V..................... Equation 1

Where m₁ = mass of the van, m₂ = mass of the car, u₁ = initial velocity of the van, u₂ = initial velocity of the car, V = Common velocity.

Given: m₁ = 2578 kg, m₂ = 825 kg, u₂ = 0 ( the car was at rest), V= 8.5 m/s

Substituting these values into equation 1, and solving for u₁

2578(u₁) + (825 × 0) = (2578 + 825)8.5

2578u₁ = 28925.5

Dividing both side of the equation by the coefficient of u₁

2578u₁/2578 = 28925.5/2578

u₁ = 11.22 m/s

The initial speed of the car = 11.22 m/s

3 0

2 years ago

A 50 pF capacitor and a 200 pF capacitor are both charged to 4.2 kV. They are then disconnected from the voltage source and are

8_murik_8 [283]

Answer:

The energy lost is zero.

Explanation:

Given that,

First capacitor = 50 pF

Second capacitor = 200 pF

Potential = 4.2 kV

We need to calculate the energy lost

Using formula of energy lost

$E = E_{initial}-E_{final}$

Put the value into the formula

$E=\dfrac{1}{2}C_{1}V^2+\dfrac{1}{2}C_{2}V^2-\dfrac{}{}(C_{1}+C_{2})V^2$

$E=\dfrac{1}{2}\times50\times10^{-12}\times(4.2\times10^{3})^2+\dfrac{1}{2}\times200\times10^{-12}\times(4.2\times10^{3})^2-\dfrac{1}{2}\times(50\times10^{-12}+200\times10^{-12})\times(4.2\times10^{3})^2$

$E=0\ J$

Hence, The energy lost is zero.

7 0

2 years ago

How is the grouping of states in a constellation different from the grouping of planets in the solar system?

Diano4ka-milaya [45]

Stars in a constellation only appear to be grouped together when viewed from Earth, Planets really are grouped together.

8 0

2 years ago

What is phase voltage of star connected three phase system in balanced loa is 240 the line voltage

WITCHER [35]

Answer:

Explanation: the Star Connection, the similar ends (either start or finish) of the three windings are connected to a common point called star or neutral point. The three-line conductors run from the remaining three free terminals called line conductor

3 0

2 years ago

If a persons use of cigerattes increases,then the persons lung function will decrease because the chemicals in cigarettes damage

aleksley [76]

Answer:

1) use of cigarettes

2) lung function

Explanation:

The variable that we can change or which can be controled is treated as the independent variable.

The variable that we cannot change or which is being controlled by the independent variable is called as the dependent variable.

In this case the thing we can control is use of cigarettes, not the lung function. So use of cigarettes is the independent variable

Lung function is something we cannot directly control. ( can be controlled by medicine and exercises but not in the same way as use of cigarettes) So lung function is to be taken as dependent variable.

5 0

2 years ago