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2 years ago

What do you need to build a working electric motor?

Physics

1 answer:

FrozenT [24]2 years ago

5 0

Answer: D a source of electricity

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

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Which exercise program is least effective for developing cardiovascular fitness?

Vanyuwa [196]

Please lord thank you please thank you

6 0

2 years ago

Read 2 more answers

If the diameter of the space station is 730 m , how many revolutions per minute are needed for the "artificial gravity" accelera

nignag [31]

For circular motion we know that

F=ma=v^2/r 

Therefore: 

v = sqrt (rma) 

Also, for cicular motion: 

rev/min. = 60v/(2r*pi) 

So your equation is: 

rev./min = 60sqrt(rma)/(2pi*r) 

For the mass (m) we can just use 1 kg.

rev./min = 60sqrt(730*1*9.8)/(2pi*730) =60sqrt(7154)/(4584.4)
rev./min = 60sqrt(7154)/(4584.4) =1.11 rev/min

the answer is 1.11 rev/min

4 0

2 years ago

A lion has a mass of 45 kg. Answer the following questions about it, using correct units. a. The lion runs at a speed of 14.2 m/

Eva8 [605]

A) The kinetic energy of an object is given by:
$K= \frac{1}{2}mv^2$
where m is the mass of the object, and v its speed. For the lion in our problem, m=45 kg and v=14.2 m/s, so its kinetic energy is
$K= \frac{1}{2}mv^2= \frac{1}{2}(45 kg)(14.2 m/s)^2=4537 J$

b) the increase in gravitational potential energy of the lion is given by:
$\Delta U = mg \Delta h$
where g is the gravitational acceleration, and $\Delta h$ is the increase in altitude of the lion. In this problem, $\Delta h=28 m$ , so the increase in gravitational potential energy is
$\Delta U=mg \Delta h=(45 kg)(9.81 m/s^2)(28 m)=12361 J$

c) When the fox reaches the top of the tree, its gravitational potential energy is
$U=mgh=(1.8 kg)(9.81 m/s^2)(3.8 m)=67 J$
As it jumps, its kinetic energy is
$K= \frac{1}{2}mv^2= \frac{1}{2}(1.8 kg)(8.1 m/s)^2=59 J$
So the total mechanical energy of the fox as it jumps is
$E=U+K=67 J + 59 J =126 J$

6 0

2 years ago

What is the American psychology Association ethical principle of psychology and code of conduct based upon

solmaris [256]

The correct answer is B

4 0

2 years ago

A cyclist is travelling eastwards at a velocity

VMariaS [17]

Answer:

0.02 m/s^2

Explanation:

change in velocity= 4.5m/s - 2.3m/s = 2.2 m/s

acceleration= change in velocity/change in time

acceleration= 2.2/120= 0.0183

= 0.02 (to 2 significant figures)

8 0

2 years ago