Answer:
∴Inductance of solenoid A is 
of inductance of solenoid B.
Explanation:
Inductance of a solenoid is
N= number of turns
= length of the solenoid
d= diameter of the solenoid
A=cross section area
B=magnetic induction
= magnetic flux
= Current
Given that, Solenoid A has total number of turns N, length L and diameter D
The inductance of solenoid A is
Solenoid B has total number of turns 2N, length 2L and diameter 2D
The inductance of solenoid B is
Therefore,
∴Inductance of solenoid A is of inductance of solenoid B.
Answer:
50 h
Explanation:
The heat required (Q) to heat the water can be calculated using the following expression.
Q = c × m × ΔT = (4.184 kJ/kg.°C) × 1000 kg × (200°C - 60°C) = 5.9 × 10⁵ kJ
where,
c: specific heat capacity
m: mass
ΔT: change in the temperature
The solar collector has an area of 6 m² and the intensity delvered by sunlight is 550 W/m². The power (P) submitted by the collector is:
6 m² × 550 W/m² = 3 × 10³ W
The energy collected is transformed into heat. We know that:
P = E/t = Q/t
where
t: time
t = Q/P = 5.9 × 10⁸ J / (3 × 10³ J/s) = 2 × 10⁵ s × (1 h / 3600 s) = 50 h
Answer:
The ball exerts a force of 400 N on the bat.
Explanation:
Given that,
A baseball player hits a ball with 400 N of force.
We need to find the force the ball exert on the bat.
We know that,
According to Newton's third law, when object 1 exerts a force on an object 2, then object 2 will exert a force on object 1 but in opposite direction.
So, the ball exerts a force of 400 N on the bat.
Since the new distance is 3 times the old distance,
the new force is (1/3²) = 1/9th of the old force.
That's kind-of Choice-D, but I really don't like the way choice-D is worded.
"9 times smaller" is really pretty meaningless.
Answer:
A path that allows most of the current in an electric circuit to flow around or away from the principal elements or devices in the circuit.
