perimeter of a rectangle = 2(L+B)
90=2(L+B)
90/2=L+B
45=L+B
The conservation of energy always holds true even when not clearly observable in machines that are less than 100% efficient. More often than not a machine will suffer energy losses (e.g. consider for a cooling fan: friction between the rotating blades, drag resistance in the air the fan is pushing around, resistance in the wire, and heat radiating/conducting away from the circuitry).
Answer:
ΔΦ = -3.39*10^-6
Explanation:
Given:-
- The given magnetic field strength B = 0.50 gauss
- The angle between earth magnetic field and garage floor ∅ = 20 °
- The loop is rotated by 90 degree.
- The radius of the coil r = 19 cm
Find:
calculate the change in the magnetic flux δφb, in wb, through one of the loops of the coil during the rotation.
Solution:
- The change on flux ΔΦ occurs due to change in angle θ of earth's magnetic field B and the normal to circular coil.
- The strength of magnetic field B and the are of the loop A remains constant. So we have:
Φ = B*A*cos(θ)
ΔΦ = B*A*( cos(θ_1) - cos(θ_2) )
- The initial angle θ_1 between the normal to the coil and B was:
θ_1 = 90° - ∅
θ_1 = 90° - 20° = 70°
The angle θ_2 after rotation between the normal to the coil and B was:
θ_2 = ∅
θ_2 = 20°
- Hence, the change in flux can be calculated:
ΔΦ = 0.5*10^-4*π*0.19*( cos(70) - cos(20) )
ΔΦ = -3.39*10^-6
Answer:
0
Explanation:
Given:
initial velocity, 
distance of telescope from the launch pad, 
time after which the observation starts, t = 3 min.
Now, from the equation of motion:
Which indicates that the after the given time the rocket would have fallen down on the ground if it did not had an acceleration of its own.
<span>✡ Answers:
Good
- </span><span>The reason that people and animals can walk. Because of friction we are able to walk one foot to the other.
- Prevents accidents, like being able to slam on a cars break and sliding endlessly.
Bad:
- When trying to go faster, friction can prevent that. In a car, or even trying to roller skate.
- It will damage the object that is sliding. Weather its skinning your knee of busting a tire. </span><span><span>✡</span>
</span>
✡Hope this helps<span>✡
</span>
