Answer:
0.3 N
Explanation:
i = 400 A
B = 30 x 10^-6 T
L = 25 m
Force due the current carrying conductor placed in a magnetic field
F = B i L SinФ
where, Ф be the angle between length vector and magnetic field vector
F = 30 x 10^-6 x 400 x 25 = 0.3 N
Answer:
Time taken by the coin to reach the ground is 1.69 s
Given:
Initial speed, v = 11.8 m/s
Height of the building, h = 34.0 m
Solution:
Now, from the third eqn of motion:
Now, time taken by the coin to reach the ground is given by eqn (1):
v' = v + gt
Answer:
#See solution for details.
Explanation:
-An electromagnet's field can be rapidly changed by just controlling the amount of current. The magnetic strength can be varied over time.
-This way, only a sufficient amount of current will be supplied to meet the needs.
-Unlike the electromagnet, the permanent magnet has a fixed magnetic strength and can only lift a specified weight.
This is kind of an awkward situation.
A, B, and C are definitely false:
A ... gasoline is not a renewable resource
B ... hydroelectric dams don't use wind for anything; windmills do
C ... fossil fuels are not renewable resources
So that leaves D, but D is partly absurd too.
Natural gas burning does not produce gases to turn the turbines. Natural gas is burned to produce HEAT, just like on the stove in my kitchen. The heat is used to boil water, and the steam from the boiling water is what turns the turbines to generate electrical energy.
But I guess you gotta pick <em>choice-D</em> as the answer.