Answer:
Option e is correct.
Explanation:
An object of mass m moves horizontally, increasing in speed from 0 to v in a time t.
We know that,
Work done = change in kinetic energy
Here, u = 0
So,
Also,
Power = work done/time
So,
So, the correct option is (e).
Answer:
The number of half-lives that have occurred are 4.
Explanation:
Formula used for number of half lives :
where,
a = amount of reactant left after n-half lives
= Initial amount of the reactant
n = number of half lives
n = 4
The number of half-lives that have occurred are 4.
Two methods of transfer of heat are involved in this process: conduction and convection.
In fact, the metal spoon is heated by conduction because the molecules of the boiling water collide with the molecules of the spoon, releasing heat to it; and also by convection, because in the pot of boiling water masses of hot water goes upward and they give their heat to the spoon, then these masses become cooler and they go down, replaced by other masses of hot water.
Answer:
The kinetic energy INCREASES as the roller coaster goes downhill.
Kinetic energy is greatest at POINT 2
Potential energy is greatest at POINT 1
Kinetic energy is decreasing while potential energy is increasing between points 3 AND 4
Which chart comes closest to the relationship between kinetic energy and potential energy at point 6 - CHART OF ANY POINT IN THE SAME HEIGHT AS OF 6
Explanation:
⇒As the potential energy increases , kinetic energy decreases.
⇒Potential energy here is gravitational potential energy.
⇒Thus, more we move away from the centre of the earth , more will be the gravitational potential energy or decrease in kinetic energy
Answer: The light bulb produces the continuous light. At minimum wavelength the spectrum have maximum intensity.
Explanation:
According to Wein's displacement law, the wavelength is inversely proportional to the temperature.
The intensity depends on the frequency. The frequency is inversely proportional to the wavelength.
Therefore, when the temperature of the light bulb will be maximum then the wavelength will be minimum. At minimum wavelength the spectrum have maximum intensity.
