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3 years ago

What is conductivity?

Physics

1 answer:

kirill [66]3 years ago

3 0

Answer:

Conductivity is the measure of the ease at which an electric charge or heat can pass through a material. A conductor is a material that gives very little resistance to the flow of an electric current or thermal energy.

Explanation:

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How can the achievement of lifting a rocket off the ground and into space be explained

KengaRu [80]

It would be newtons third law. That is because the third law states<span> that for every action (force applied) there is an equal and opposite reaction (resulting force) that will occur.</span>

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4 years ago

In the general world view of magnetism, magnetic fields arise from : stationary color charges

Paladinen [302]

Answer:

The correct option is "moving electric charges or currents".

Explanation:

Magnetic field is used to define as a field that surrounds a current carrying conductor or moving electric charge by virtue of which it exerts a force on another current carrying conductor or a moving charge itself.

The magnetic field generated by a moving charge is given by

$B=\frac{\mu _{o}q}{4\pi }\times \frac{v\times r}{|r|^{3}}$

where

q = is the magnitude of charge

v = is the velocity vector of the moving charge

r = is the position vector of the point at which the field is calculated

|r| = is the magnitude of position vector.

Similar the magnetic field generated by a current carrying conductor is given by

$B=\frac{\mu _{o}I}{4\pi }\times \int \frac{dl\times r}{|r|^{2}}$

where

I is the current

The integration is carried out along the whole length of conductor.

Also since magnetic mono poles do not exist or their existence is not confirmed until now so it is not an appropriate option.

6 0

3 years ago

What is the gravitational force between mars and Phobos

alina1380 [7]

Answer:

$F=5.16\times 10^{15}\ N$

Explanation:

We have,

Mass of Mars is, $m_M=6.42\times 10^{23}\ kg$

Mass of its moon Phobos, $m_P=1.06\times 10^{16}\ kg$

Distance between Mars and Phobos, d = 9378 km

It is required to find the gravitational force between Mars and Phobos. The force between two masses is given by

$F=G\dfrac{m_Mm_P}{d^2}$

Plugging all values, we get :

$F=6.67\times 10^{-11}\times \dfrac{6.42\times 10^{23}\times 1.06\times 10^{16}}{(9378\times 10^3)^2}\\\\F=5.16\times 10^{15}\ N$

So, the gravitational force is $5.16\times 10^{15}\ N$ .

8 0

4 years ago

An 1120 kg car traveling at 17 m/s is brought to a stop while skidding 40 m. Calculate the work done on the car by friction forc

sergij07 [2.7K]

Answer:

Approximately $(-1.6 \times 10^{5}\; \rm J)$ (assuming that the car was on level ground.)

Explanation:

When an object of mass $m$ is moving at a speed of $v$ , the kinetic energy of that object would be $(1/2) \, m \cdot v^{2}$ .

Initial kinetic energy of the car:

$\begin{aligned}&\frac{1}{2}\, m \cdot v^{2} \\ &= \frac{1}{2}\times 1120\; \rm kg \times (17\; \rm m \cdot s^{-1})^{2} \\ &\approx 1.6\times 10^{5}\; \rm J \end{aligned}$ .

After the car comes to a stop, the kinetic energy of this car would be $0\; \rm J$ because the car would not be moving.

Change to the kinetic energy of the car: $\text{Final KE} - \text{Initial KE} = -1.6 \times 10^{5}\; \rm J$ .

If the car is traveling on level ground, friction would be the only force that contributed to this energy change. Hence:

$\text{Work of friction} = \text{Energy change} = -1.6\times 10^{5}\; \rm J$ .

The value of the work that friction did is negative. The reason is that at any instant before the car comes to a stop, friction would be exactly opposite to the direction of the movement of the car.

The work of a force on an object is the dot product of that force and the displacement of that object. The dot product of two vectors of opposite directions is negative. Hence, in this question, the work that friction did on the car would be negative because the friction vector would be opposite to the movement of the car.

6 0

3 years ago

Tectonic plates move ________. A. about a kilometer per year B. at different speeds C. about one yard per year D. at the same sp

Alona [7]

Answer:

B. at different speeds.

Explanation:

Tectonic plates are able to move because the Earth's lithosphere has greater mechanical strength than the underlying asthenosphere. Lateral density variations in the mantle result in convection; that is, the slow creeping motion of Earth's solid mantle. Plate movement is thought to be driven by a combination of the motion of the seafloor away from spreading ridges due to variations in topography (the ridge is a topographic high) and density changes in the crust (density increases as newly formed crust cools and moves away from the ridge. These average rates of plate separations can range widely. The Arctic Ridge has the slowest rate (less than 2.5 cm/yr), and the East Pacific Rise near Easter Island, in the South Pacific about 3,400 km west of Chile, has the fastest rate (more than 15 cm/yr).

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3 years ago

What is conductivity?​

What is conductivity?