Answer:E
Explanation:
Given
speed of electron is v
Magnitude of magnetic field B
radius of circular motion
Work done by Magnetic field is given by
where will yield a vector perpendicular to both magnetic field and velocity vector .
will also perpendicular to displacement d so net work done will be zero
Answer:
The position, speed, direction and acceleration
Answer:
review or print them later.
Answer:
F = 2.6692 x 10⁻⁹ N
Explanation:
Given,
The mass of the rock, m = 10 kg
The mass of the boulder, M = 100 kg
The distance between them, d = 5 m
The gravitational force between the two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them. It is given by the formula
<em> F = GMm/d² newton</em>
Where,
G - Universal gravitational constant
Substituting the given values,
F = 6.673 x 10⁻¹¹ x 100 x 10 / 5²
F = 2.6692 X 10⁻⁹ N
Hence, the force between the two bodies is, F = 2.6692 X 10⁻⁹ N
Answer:
C
B
C
Explanation:
To increase the efficiency of a machine, it is advisable that one reduces friction within the machine parts as much as possible through common procedures such as greasing and oiling. This is helps to reduce the amount of energy lost due to friction hence contributing to output which finally is useful in calculating efficiency of a machine.
Efficiency can't be 100% since it is found by dividing work output verses input but the output is usually slightly less than the input energy due to energy losses within a machine. The losses that occur are mainly attributed to frictional losses.
Here efdiciency and work output are given but input is missing. Converting efficiency into decimal we have 0.75 and since efficiency=output/input then the input will be given by output/efficiency and by substitution 240/0.75=320 J