Answer:
(a)
(b)
Explanation:
Part (a)
The total length of copper cord L=86.3 m
The cross sectional area A=1.71×10⁻⁶m²
The resistivity of copper p=1.72×10⁻⁸Ω
Thus the resistance of extension cord is
Part (b)
The resistance of trimmer Rt=17.9 ohms
When voltage of 120V is applied then the current I is passing through series circuit is
Thus the voltage across the trimmer is:
<h2>
The balloon is moving when it is halfway down the building at 20.78 m/s.</h2>
Explanation:
We have equation of motion v² = u² + 2as
Initial velocity, u = 0 m/s
Acceleration, a = 9.81 m/s²
Displacement, s = 0.5 x 44 = 22 m
Substituting
v² = u² + 2as
v² = 0² + 2 x 9.81 x 22
v² = 431.64
v = 20.78 m/s
Velocity at 22 m = 20.78 m/s
The balloon is moving when it is halfway down the building at 20.78 m/s.
A: Renewable resources make cleaner energy.
D: It often costs more to produce energy from renewable resources.
E: More local suppliers can provide energy from renewable resources to customers
Explanation:
Renewable sources of energy are cleaner and more accessible source of energy. They are easily replenished.
With current usage metrics, they can satisfactorily meet the energy demand of the world without affecting their supply.
- Renewable energy include biomass, wind energy, wave energy, solar energy e.t.c
- These energy sources are easily replenished.
- To produce energy from renewable sources, it usually costs more.
- Most equipment and devices that produces energy from renewable sources are highly pricey.
- Renewable energy is the future of energy production.
- Most smart cities around the world have solely relied on harnessing this source of energy.
- They no carbon emission to the environment and would not lead to climate change.
learn more:
Non - renewable source of energy brainly.com/question/3386515
#learnwithBrainly
Answer:
(a) 1.11sec
(b) 14.37m/s
(c) 31.78m
Explanation:
U = 18m/s, A = 37°, g = 9.8m/s^2
(a) t = UsinA/g = 18sin37°/9.8 = 18×0.6018/9.8 = 1.11sec
(b) Ux = UcosA = 18cos37° = 18×0.7986 = 14.37m/s
(c) R = U^2sin2A/g = 18^2sin2(37°)/9.8 = 324sin74°/9.8 = 324×0.9613/9.8 = 31.78m