V=f*λ
1.94x10^8m/s=f*(5.89x10^-7m)
f=3.29x10^14 Hz
the answer is D
Answer:
The minimum time interval required is 18.1 sec
Explanation:
Given:
Magnetic field T
Minimum induced emf V
Angle between magnetic field and area vector 34°
Area of door
According to the faraday's law,
Where magnetic flux
From the formula of magnetic flux,
Initially,
Wb
When door is closed,
Wb
Hence
Wb
Put the values in above equation,
sec
Therefore, the minimum time interval required is 18.1 sec
Answer:
196J
Explanation:
Given parameters:
Mass of skateboard = 1kg
Height off the ground = 20m
Unknown:
Potential energy = ?
Solution:
The potential energy is the energy due to the position of a body above the ground.
It is mathematically expressed as:
Potential energy = mass x acceleration due gravity x height
Potential energy = 1 x 9.8 x 20 = 196J
Answer:The horizontal area enclosed by the waterline of the ship is 12,797.88m2
Explanation: Mass of the ship=29000kg
Total mass of 50 ships= 50×29000
Total Mass=1450000kg
Volume of water with mass= mass/ density
Assuming density of ocean water =1030kgm3
Volume=1450000/1030
Volume=1407.77m3
Area enclosed by the ship =A=V/h
h=11cm=0.11m
Area= 1407.77/0.11
Area=12,797.88m2
Work = Force* Distance
2000*1000=2000000
Power = Work/Time
2000000/45=<span>44444.44 Watts</span>