The first rubber balloon was made by Professor Michael Faraday in 1824, out of two sheets of rubber whose edges were pressed together. Hot air balloonwas the balloon to make the first recorded manned flight. It was made by the Montgolfier brothers and launched on 21 November 1783.
<span>Advantages:
- Easy to repair
- Protect the shore
- Function after minor damage
- Don't disturb the shoreline
Disadvantages:
- Expensive
- Ugly
- Ruin the surfing tourism industry
- Can be displaced easily by waves
- Don't absorb all energy due to gaps between the breakwater</span><span>
</span>
Answer:
33.6 Ns backward.
Explanation:
Impulse: This can be defined as the product of force and time. The S.I unit of impulse is Ns.
From Newton's second law of motion,
Impulse = change in momentum
I = mΔv................................. Equation 1
Where I = impulse, m = mass of the skater, Δv = change in velocity = final velocity - initial velocity.
Given: m = 28 kg, t = 0.8 s, Δv = -1.2-0 = -1.2 m/s (Note: the initial velocity of the skater = 0 m/s)
Substituting into equation 1
I = 28(-1.2)
I = -33.6 Ns
Thus the impulse = 33.6 Ns backward.
(i) The direction of the current will be in opposite direction to the magnetic field.
(ii) The magnitude of the emf induced in the circuit is 0.359 V.
(iii) The induced current if the circular coil is 0.048 A.
b(i) The magnetic flux linkage through the coil is 1.41 x 10⁻⁴ Tm².
b(ii) The radius of the coil is r√3 m.
<h3>
Direction of the current</h3>
The direction of the current will be in opposite direction to the magnetic field.
<h3>Emf induced in the circuit</h3>
Initial area of the coil = (πd²)/4
Initial area of the coil = (π x 0.225²)/4 = 0.0398 m²
Final area of the coil = (π x 0.072²)/4 = 0.001296 m²
<h3>Induced current</h3>
I = emf/R
I = 0.359/7.5
I = 0.048 A
<h3>Magnetic flux linkage through the coil</h3>
Ф = LI
Ф = 0.015 x 0.0094
Ф = 1.41 x 10⁻⁴ Tm²
<h3>Radius of the coil</h3>
where;
Learn more about inductance of coil here: brainly.com/question/17086348
Answer:
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Explanation:
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