Answer:
Speed, v = 396.03 m/s
Explanation:
It is given that,
Length of the rod, l = 30 cm = 0.3 m
Magnetic field, 
The potential difference between the ends is 6 V, E = 6 V
The rod moves in a plane perpendicular to a magnetic field with some speed. Due to this motion an emf is induced it it. It is given by :
Where
v is the speed of rod
v = 396.03 m/s
So, the speed of the rod is 396.03 m/s. Hence, this is the required solution.
If we consider an inertial reference system, that is, a system in which the laws of motion comply with Newton's laws, we will have that the speed of light will be the same in all those frames of reference. In other words, the speed of light in a vacuum will be independent of the movements of each of the observers.
Under this premise<em> he/she measures the speed of the laser light to be equal to the speed of light</em>, because the light travels at the same speed in every inertial frame of reference
Im fairly certain that the answer would be D, and this is because of the law of conservation of energy/momentum.
Answer:
OPTION (C)
Explanation:
m(magnification) = -0.4 means a real, inverted and diminished image is formed in front of the mirror.
Answer:
The work done by the weightlifter, W = 700 J
The power of the weightlifter, P = 350 watts
Explanation:
A weightlifter lifts a set of weights a vertical distance, s = 2 m
The force exerted to lift the weight, F = 350 N
The work done by the body is defined as the product of the force applied by the body to the displacement it caused.
W = F x s
= 350 N x 2 m
= 700 J
The work done by the weightlifter, W = 700 J
The time taken by the weightlifter to lift the weight, t = 2 s
The power is defined as the rate of body to do work. It is given by the equation,
P = W / t
= 700 J / 2 s
= 350 watts
Hence, the power of the weightlifter, P = 350 watts
