A: 0.7 -0.8 and 0hrs
B: 0.2 - 0.4 and 1.0 -1.1 hrs
C: 0-0.2 hrs and 0.8 - 1.0 hrs
D: 0.4 - 0.7 hrs
Answer:
The peak emf in second coil is 1.876 V
Explanation:
Given :
Inductance
H
The current 
We compare above equation with standard equation,

From above equation we have,
and 
Find the inductive resistance,



The peak emf in second coil is,


V
Therefore, the peak emf in second coil is 1.876 V
Answer:
The two value of the wavelength for the out of tune guitar is

Explanation:
From the question we are told that
The wavelength of the note is 
The difference in beat frequency is 
Generally the frequency of the note played by the guitar that is in tune is

Where
is the speed of sound with a constant value 


The difference in beat is mathematically represented as

Where
is the frequency of the sound from the out of tune guitar

substituting values


The wavelength for this frequency is



For the second value of the second frequency



The wavelength for this frequency is



Answer:
The car must move at 2 m/s to have a Ke of 2,000 Joules.
Explanation:
Mark me pls
Answer:
Radius, r = 2.88 meters.
Explanation:
It is given that,
A hydrogen-filled balloon is used to lift a 120-kg stone off the ground, m₁ = 120 kg
The basket holding the stone has a mass of 10.0 kg, m₂ = 10 kg
Mass density of air, 
We know that buoyant force is equal to the weight of liquid displaced i.e.



B = 1274 N
Also, buoyant force is given by :





So, the minimum radius R of the balloon be in order to lift the stone off the ground is 2.88 meters. Hence, this is the required solution.