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2 years ago

Problems with solar energy include _____.

2 answers:

8 0

Third choice: inconsistencies in the availability of the resource
I think this is it. If we come to depend on solar energy, then we're expectedly out of luck at night, and we may unexpectedly be out of luck during long periods of overcast skies.

patriot [66]2 years ago

7 0

The answers are:

the inability of current technology to capture large amounts of the Sun's energy

the inability of current technology to store captured solar energy

inconsistencies in the availability of the resource

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A substance that produces H+ ion in a solution is an (n)

SpyIntel [72]

Answer:

acid

Explanation:

acid provides hydrigen ions

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3 years ago

Why is the temperature usually warmest a the equator and colder as you move towards the poles? *

Gwar [14]

Answer:

Option D, The equator gets more direct sunlight throughout the yea

Explanation:

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2 years ago

Read 2 more answers

In a lab, the mass of object A is 2.5 kg. Object A weighs:

dangina [55]

Answer:

25N

Explanation:

Assuming the lab is on earth:

w = mg = 2.5 (9.81) = 25N

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2 years ago

7. A toy car of mass 1.2 kg is driving vertical circles inside a hollow cylinder of radius 2.0m. It is moving at a constant spee

wlad13 [49]

Answer:

$N_{top}=9.8N\\N_{bottom}=33.4N$

b) $v_{min}=4.4m/s$

Explanation:

The net force on the car must produce the centripetal acceleration necessary to make this circle, which is $a_{cp}=\frac{v^2}{R}$ . At the top of the circle, the normal force and the weight point downwards (like the centripetal force should), while at the bottom the normal force points upwards (like the centripetal force should) and the weight downwards, so we have (taking the upwards direction as positive):

$-m\frac{v^2}{R}=-N_{top}-mg\\m\frac{v^2}{R}=N_{bottom}-mg$

Which means:

$N_{top}=m\frac{v^2}{R}-mg=(1.2kg)\frac{(6m/s)^2}{2m}-(1.2kg)(9.8m/s^2)=9.8N\\N_{bottom}=m\frac{v^2}{R}+mg=(1.2kg)\frac{(6m/s)^2}{2m}+(1.2kg)(9.8m/s^2)=33.4N$

The limit for falling off would be $N_{top}=0$ , so the minimum speed would be:

$0=m\frac{v_{min}^2}{R}-mg\\v_{min}=\sqrt{Rg}=\sqrt{(2m)(9.8m/s^2)}=4.4m/s$

3 0

2 years ago

6. A 73-kg woman stands on a scale in an elevator. The

olga nikolaevna [1]

Answer:

Explanation:

n = m(g +a)

n= normal force (N)

m=mass (kg)

g=acceleration of gravity

a= acceleration of elevator

rearrange:

a= n/m - g

a= (810 N/73 kg) - 9.8 m/s ^2

a= 1.3 m/s ^2 up

and the acceleration is upwards bc her weight is less than the scale reading

3 0

2 years ago