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andrey2020 [161]
3 years ago
8

When energy is changed from one form to another, some of the energy is lost to the surroundings as waste thermal energy. The mor

e steps needed to arrive at the desired energy or the more types of energy that are generated, the more energy is wasted.
Which object would likely have the least amount of wasted energy?

A) an electric drill
B) a solar cell
C) a car engine
D) a hydroelectric dam
Physics
2 answers:
Alex3 years ago
8 0

Answer: The correct answer is solar cell.

Explanation:

When energy is changed from one form to another, some of the energy is lost to the surroundings as waste thermal energy.

From the given options,

Electric drill: Electric drill converts the electrical energy into mechanical energy. When the drill break the the object then the mechanical energy is converted into the heat energy.

Car engine: Car engine converts the chemical energy into the thermal energy. This thermal energy gets converted into the mechanical energy. Then, this mechanical energy is used to accelerate the vehicle.

Hydroelectric dam: Here, the potential energy stored in the water at some height is converted into mechanical energy. Then, this mechanical energy is converted into the kinetic energy. Then, finally, this kinetic energy is converted into electrical energy.

In above options, there is a dissipation of energy while one form of energy gets converted into another.

The more steps needed to arrive at the desired energy or the more types of energy that are generated, the more energy is wasted.

Solar cell: The solar cell converts the solar energy into electrical energy.

Therefore, a solar cell have the least amount of wasted energy.

Taya2010 [7]3 years ago
7 0
The answer is B Solar cell just took the test
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<u><em>note:</em></u>

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sasho [114]

Answer:

The velocity of the boat with respect to the ground is 3 km/h

Explanation:

The speed of an object is different depending on the reference system you use. This is called relative speed.

A boat travels upstream, this means that it moves in the opposite direction to the river current.

A boat travels upstream, this means that it moves in the opposite direction to the river current. Then, if the boat moves in the positive direction of the x axis at 10 km / h with respect to the water of a river, the water flows in the negative direction of the x axis at 7 km / h with respect to the ground.

This causes the speed of the boat relative to the ground to be calculated as follows:  

<em>VbG = Vbw - VwG </em>

where VbG is the speed of the boat relative to the ground, Vbw is the speed of the boat relative to the water of the river and VwG is the speed of the water relative to the ground.

So: VbG=10 km/h – 7 km/h

<u><em>VbG= 3 km/h </em></u>

The direction of this velocity is in the positive x-direction.

4 0
3 years ago
Vectors A and B lie in the xy-plane. Vector A has a magnitude of 19.1 and is at an angle of 125.5º counterclockwise from the +x-
Nady [450]

Answer:

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Explanation:

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8 0
3 years ago
A car with a mass of 1,500 kg is accelerating at a rate of
AURORKA [14]

Answer:

The net force acting on the car is

3

×

10

3

Newtons.

Hope this helps you

Explanation:

Force is defined as the product of the mass of the body and its aaceleration,

⇒

F

=

m

a

Substituting the above given values we get,

F

=

(

1500

k

g

)

(

2.0

m

/

s

2

)

=

3000

N

=

3

×

10

3

N

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Harrizon [31]

Answer:

CH4

Explanation:

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(Li+)+(F-)=charges cancel out.

7 0
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