sanskaartijaria

In simple harmonic motion when is the speed the greatest?

1. when the magnitude of the acceleration is maximum. 
2. when the displacement is maximum.
3. when the magnitude of the acceleration is minimum.
4. when the kinetic energy is minimum.

1. Calculate the quantity of heat energy which must be transferred to 2.25 kg of brass to 
raise its temperature from 20 ℃ to 240 ℃ if the specific heat of brass is 394 J.kg-K.

2. Find the change in temperature produced by 10 kJ of heat energy added to 500 g 
copper. Specific heat of copper 0.39 kJ/kg-K.

3. Explain why, for a gas, the specific heat at constant volume has a different value 
from the specific heat at constant pressure.
An ideal gas is contained in a cylinder fitted with a piston. Initially the temperature of the 
gas is 15℃. If the mass of the gas is 0.035 kg, calculate the quantity of heat energy 
required to raise the temperature of the gas to 150 ℃ when:
(a) The piston is fixed;
(b) The piston moves and the pressure is constant.
For the gas, 𝑐𝑣 = 676 J/kg-K and 𝑐𝑝 = 925 J/kg-K.

Chemical formula of bleaching powder?

In simple harmonic motion, when is the speed the greatest?
I. when the magnitude of the force is minimum
II. when the potential energy is maximum.
III. when the potential energy is zero.
IV. when the displacement is maximum.