Answer:
Currents in the aluminum sheet set up a magnetic field that opposes the oscillations
Explanation:
It has been stated in the question that the aluminum sheet hangs from one of the arms and passes between the poles of the magnet and causes the magnetic field to decay rapidly. In the absence of this magnetic breaking, the oscillation may continue for a long time.
As the aluminum hangs from one of the sheets and passes between the poles of the magnet, the magnetic flux linked to the sheet changes and emf is induced in the sheet according to Lenz law. As a result of this induced emf, eddy currents are developed on the plate. The Eddy currents opposes the magnetic force on the aluminum sheets. This opposes the oscillation of the aluminum sheet and causes it to come to rest.
The answer to this question would be- A.radio
Answer: The definition of an endothermic reaction is that the products have higher energy than the reactants, resulting in a positive enthalpy of reaction.
Explanation:
Answer: 0.0746 grams of hydrogen
Explanation:
To calculate the mass of hydrogen :
(Vapor pressure of water is 23.78 mmHg at 25 ∘C )
According to avogadro's law, 1 mole of every substance occupies 22.4 L at NTP, weighs equal to the molecular mass and contains avogadro's number 
of particles.
According to the ideal gas equation:
P = Total Pressure = 752 mm Hg
pressure of hydrogen = Total Pressure - Vapor pressure of water = (752 -23.78 )mm Hg = 728.22 mm Hg = 0.958 atm (760mmHg=1atm)
V= Volume of the gas = 0.953 L
T= Temperature of the gas = 25°C = 298 K
R= Gas constant = 0.0821 atmL/K mol
n= moles of gas= ?
Mass of 
Thus 0.0746 grams of hydrogen is collected.
