Answer:
Option (b).
Explanation:
Mass of an object is defined as the amount of matter contained in it. In this case, the mass of helium gas in a balloon is the amount of matter inside the balloon. It is independent of the outside condition.
Hence, out of 4 options, the correct option is (b).
Power in physics terms depends on both work and time because of the equation P=W/T
Hope this helps :D
Answer:
Explanation:
Use the Coulomb's law. According to it, the flux through entire sphere would be
where, q is the total charge enclosed in the sphere and 
is the absolute permittivity.
Thus, the flux through the hemisphere would be half of it i.e.
Answer:
c. wood is the corrected answer
The electrical free path of electron is disturbed with vibrations not normal to normal / room temperature because the electrical heater is agitating the conductor material. this causes the electrons to vibrate more creating more resistance to the flow.
