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kondor19780726 [428]
3 years ago
11

What do you need to build a working electric motor?

Physics
1 answer:
FrozenT [24]3 years ago
5 0

Answer: <u><em>D a source of electricity</em></u>

Explanation: I have done that question please tell me if it is correct

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What does the big bang theory explain?
kotegsom [21]
The answer is c because the big bang theory is about how the universe was created by infinite energy 
6 0
3 years ago
A river has a steady speed of 0.566 m/s. A student swims upstream a distance of 1.57 km and returns (still swimming) to the star
MArishka [77]

Answer:

3503.72 seconds

819.96 seconds

Explanation:

V_r=Velocity of river = 0.566 m/s

V_s=Velocity of student = 1.17 m/s

Distance to travel = 1.57 km = 1570 m

So,

Time = Distance / Speed

\frac{1570}{V_s-V_r}+\frac{1570}{V_s+V_r}=t\\\Rightarrow t=\frac{1570}{1.17-0.566}+\frac{1570}{1.17+0.566}\\\Rightarrow t=3503.72\ s

Time taken by the student to complete the trip is 3503.72 seconds

In still water

\frac{1570}{V_s}+\frac{1570}{V_s}=t\\\Rightarrow t=\frac{1570}{1.17}+\frac{1570}{1.17}\\\Rightarrow t=2683.76\ s

The difference in time between moving water and still water is 3503.72-2683.76 = 819.96 seconds

5 0
2 years ago
If an object has zero acceleration, does it have to have zero velocity?
adelina 88 [10]

Answer:

Yes, the velocity would also be zero.

Explanation:

Acceleration is the change in velocity over time, therefore, there has to be a change in velocity for something to accelerate. which means without acceleration, the object has no velocity.

3 0
3 years ago
Help !!
777dan777 [17]
<span>One leg is  = 12 m, and the other leg is 16 m. </span>
3 0
3 years ago
The area of the bar over r = 2 is 0.234. what is the area of the bar over r = 4?
natita [175]
The area of the bar over r=4 is 0.468
4 0
3 years ago
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