Answer:
Explanation:
Average energy density of a magnetic field
= (1 / μ₀) x B²
= ( 1 / 4π x10⁻⁷ )x 2
= .159 x 10⁷ J / m³
Volume of space where field exists
= πr² x L
3.14 x .4² x .5 m³
= .2512 m³
Total energy contained in magnetic field
= .2512 x .159 x 10⁷
= 4 x 10⁵ J .
Rate of dissipation = 4 x 10⁵ / 20 J/s
= 2 x 10⁴ J /s
Answer:
Every characteristic property is unique to one given substance. Scientists use characteristic properties to identify an unknown substance. Characteristic properties are used because the sample size and the shape of the substance does not matter.
Explanation:
A characteristic property is a chemical or physical property that helps identify and classify substances. The characteristic properties of a substance are always the same whether the sample being observed is large or small. Examples of characteristic properties include freezing/melting point, boiling/condensing point, density, viscosity and solubility.
100 J of kinetic energy but no gravitational potential energy if GPE of the ground is assumed to be zero.
<h3>Explanation</h3>
Kinetic Energy
The ball carries kinetic energy for being in motion. The size of that energy is given as:
where
- is the mass of the object, and
- is its speed.
SI units:
- : joules.
- : kilograms.
- : meters per second.
For this ball:
.
Gravitational Potential Energy
Whether the ball carries gravitational potential energy depends on the point of zero potential energy. The ball would carry GPE if the point of zero potential energy is chosen underground. However, the question emphasizes that the ball is "on the ground," which <em>implies</em> that the ground is the reference with a GPE of zero.
The gravitational field near the Earth's surface is constant. As a result, GPE is proportional to height relative to the ground (or the point of zero GPE). The ball is on the ground. Its height is zero. As a result, its GPE is also zero.
Answer:
lateral splaying of echoes in the far field can be improved by Increasing the maximum number of transmit focal zones and optimize their location.
Answer:
The velocity with which the ball strikes the ground = -5.7 m/s
Explanation:
To find the velocity with which the tennis ball hits the ground, we only need to worry about what happens up to that point. We can ignore the rebound for this part. Given:
d = -1.65
a = -9.8
vi = 0
vf = ?
*Keep in mind that the square root gives us two answers, a positve and a negative one. We use the negative one here because the final speed is downwards and the question says down is negative.