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3 years ago

Solar energy is: expensive renewable inefficient during winter all of the above

Physics

2 answers:

creativ13 [48]3 years ago

3 0

Solar energy is free and renewable.

Its efficiency is determined by the photovoltaic or heat-exchanging equipment used, and the efficiency of the infrastructure built to interconnect them. None of that depends on the time of the year. For a given amount of solar energy absorbed by the collector, the amount of useful output energy doesn't change with the season.

Mazyrski [523]3 years ago

3 0

All of the above is the right answer for Odesseyware.

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A block is hung by a string from the inside roof of a van. when the can goes straight ahead at a speed of 28 m/s, the block hang

Elis [28]

Answer:

θ =28.07⁰

Explanation:

when van moves around an unbanked curve, horizontal component of normal force is equal to centripetal force

$F_{c}= F_{n} sin\theta$

$F_{n}sin\theta= \frac{mv^{2} }{r}$ ---(1)

There is no motion in vertical direction, so vertical component of normal force is balanced with weight of block i.e.

$F_{n}cos\theta= mg$ ----(2)

divide (1) and (2)

$\frac{F_{n}sin\theta}{F_{n}cos\theta} = \frac{\frac{mv^{2} }{r} }{mg}$

$tan \theta=\frac{v^{2} }{rg}$

$\theta=tan^{-1} \frac{v^{2} }{rg}$

v = 28 m/s

r = 150 m

g = 9.8m/ $s^{2}$

θ = 28.07⁰

5 0

3 years ago

A man has a weight of 100 Newtons. How much work is done if he climbs 4meters up a ladder?

Aliun [14]

Answer:

400 J

Explanation:

Work is done when a force that is applied to an object moves that object.

The work is calculated by multiplying the force by the amount of movement of an object

W = F * d

here the man has to work against the gravitational field. (against his weight)

F =100 N

Work done = F * d

= 100 * 4

= 400 J

7 0

4 years ago

Which two actions would weaken an electromagnet?

Semenov [28]

Answer:

Decreasing the number of warps of wire

Replacing the steel core of the magnet with a plastic core

Explanation:

But I’m not exactly sure about your answers these are the two answers I had

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3 years ago

What is An invention created for fun called ?

Fantom [35]

Answer & Explanation:

A provisional patent application, also called a PPA, shows your invention as being in the process of getting a patent. This means that you will be safe from others copying your idea while your patent application is still being processed.

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4 years ago

A star's parallax angle is 0.8. How far away is the star in parsecs? Astronomy

kramer

Distance= 1/arc seconds

1/.8= 1.25 parsecs away

3 0

3 years ago

Read 2 more answers