Hello!
In a thermostat, the property of the bimetallic coil that allows it to contract and expand is that The two metals absorb different amounts of thermal energy.
This bimetallic coil is used to transform thermal energy into mechanical movement. Two metals with different thermal expansivity are joined together parallelly and the changes of temperature cause bending in different directions depending on if the temperature is rising or descending.
The differences in the thermal energy absorption of the two metals are the basis for the mechanism of this device.
Answer:
clockwise
Explanation:
We shall apply Lenz's law to find the direction of induced current in case magnetic field changes. According to this law , direction of current induced is such that it will try to oppose the cause which produces the induced current .
In the present case, downward magnetic field decreases so current will be such that downward magnetic field increases . It can happen when clockwise current is induced. So clockwise current will be induced.
Answer:
13 seconds
90 seconds
Explanation:
=Velocity of sidewalk = 1.2 m/s
=Velocity of woman = 1.6 m/s
Distance to travel = 36 m
Time = Distance / Speed
Time taken by the woman if she walks in the same direction the sidewalk is moving is 13 seconds
Time taken by the woman if she walks opposite to the direction the sidewalk is moving is 90 seconds