Answer:
D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.
Explanation:
- A physical change is a change in which there is no formation of new substances. Examples of physical changes are the melting or the evaporation of a substance (all phase transitions are examples of physical changes): in such cases, there is no formation of new substances.
- A chemical change is a change in which new substances form. Examples of chemical changes are the chemical reactions: for instance, when a candle burns, a reaction is taken place (oxygen is burnt, transforming into carbon dioxide + heat + light, so this is an example of chemical change).
Therefore, the correct answer is
D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.
Explanation:
An adiabatic process is defined as a process in which transfer of heat is equal to zero. According to the first law of thermodynamics, any change in the internal energy is actually in the form of work done.
This means that change in internal energy will be as follows.
Change in internal energy = -work one by the gas
Therefore, we can conclude that true statements for an adiabatic process is as follows.
- During an adiabatic process, the internal energy of the system changes.
- During an adiabatic process, there is no heat transfer into or out of the system.
Answer:
13.478 × 10⁻⁵T
Explanation:
Given that,
magnetic field at r = 3cm
due to the current passing through the centre of the hollow cylinder
magnetic field at r = 3cm
due to the current passing through the centre of the hollow cylinder
I₂ = current through the hollow cylinder within r₁ = 1.50cm to r₂ = 3.00cm
so,
So , magnetic of netfield is
= B₂ - B₁
= 13.478 × 10⁻⁵T
Answer:
6052114.67492 m
Explanation:
v = Velocity of cosmic ray = 0.88c
c = Speed of light =
d = Width of Earth = Diameter of Earth =
When the cosmic ray is moving towards Earth then in the frame of the cosmic ray the width of the Earth appears smaller than the original
This happens due to length contraction
Length contraction is given by
The Earth's width is 6052114.67492 m
Contraction only occurs in the cosmic ray's frame of reference in the direction of the ray. But in perpendicular direction the width remains unchanged.
Hence, the width is
Answer:
xmax = 0.65m
Explanation:
When the spring is maximum compressed all kinetic energy of both masses will be elastic potential energy of the spring. From there we can take apart xmax. Hence we have
hope this helps!!