Answer:
Lithium
Explanation:
It is the only one part of the Alkali Metals which are the most reactive in the periodic table
Answer:
So that it may trap the solar radiations and maintain the temperature of the wooden building.
Explanation:
Wood is not as effective an insulator as fiberglass. It comes in a number of widths, the widest being 3/4 inch, which has an R-value of 0.94. However, fiberglass, the thinnest of which is 3/4 inch, has an R-value of 3. Therefore, fiberglass is a better insulator.
Answer:
Em₀ = U = m g h
, Em_{f} = K = ½ m v²
Explanation:
When a car is on a ramp it has a certain amount of mechanical energy. At the highest point of the ramp the mechanical energy is fully potential given by
Em₀ = U = m g h
As part of this energy descends down the ramp, part of this energy is transformed into kinetic energy and has one part of each, even though the sum remains the initial energy
Em = K + U = ½ m v² + mg y
y <h
when it reaches the bottom of the ramp it has no height therefore there is no potential energy, all of it has been transformed into kinetic energy
Em_{f} = K = ½ m v²
This energy transformation is in the case that the friction force is zero.
If there is a friction force, it performs work against the low car, it is reflected in an increase in the internal energy (temperature) of the car. In this case the energy in the lower part is less than the initial one by a factor
= - fr L
therefore the numeraire values of the velocity are lower, due to the energy lost by friction.
The mass of the second coin for the given gravitation force is 20.9 g.
The given parameters;
- <em>distance between the two coins, r = 15 mm = 0.015 m</em>
- <em>mass of one coin, m₁ = 6.5 g = 0.0065 kg</em>
- <em>gravitational force between the coins = 4.03 × 10⁻¹¹ N</em>
The mass of the second coin is determined by applying Newton's law of universal gravitation as shown below;
Thus, the mass of the second coin for the given gravitation force is 20.9 g.
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Displacement is a vector quantity, it is the difference between final and initial position of a particle.
Since particle initial position is 16.6 m and final position is 3.22 m.
Therefore,
.
Thus, the displacement of the particle is 13.38 m in negative x- direction.