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OverLord2011 [107]
3 years ago
7

Which of the remaining designs has the highest thermal efficiency? Which of the remaining designs has the highest thermal effici

ency?
Physics
1 answer:
VashaNatasha [74]3 years ago
7 0

Answer:

DEVICE E

Explanation:

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A man pushes his child in a grocery cart. The total mass of the cart and child is 30.0 kg. If the force of friction on the cart
Ber [7]
Newton's second law states that the resultant of the forces applied to an object is equal to the product between the object's mass and its acceleration:
\sum F = ma
where in our problem, m is the mass the (child+cart) and a is the acceleration of the system.

We are only concerned about what it happens on the horizontal axis, so there are two forces acting on the cart+child system: the force F of the man pushing it, and the frictional force F_f acting in the opposite direction. So Newton's second law can be rewritten as
F-F_a = ma
or
F=ma + F_f

since the frictional force is 15 N and we want to achieve an acceleration of a=1.50 m/s^2, we can substitute these values to find what is the force the man needs:
F=(30 kg)(1.5 m/s^2)+15 N=60 N
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4 years ago
An ac source of period T and maximum voltage V is connected to a single unknown ideal element that is either a resistor, and ind
torisob [31]

Answer:

This satisfy the above given condition so we can say that this capacitor.

Explanation:

Let's take one by one option and check whether is wrong or right

<u>For inductor:</u>

I=I_osin(wt-\frac{\pi }{2})

Given that at t=T/4 ,I=0 and we know that

w=\dfrac{2\pi }{T}

So at T/4

I=I_osin(\frac{2\pi }{T}\times \frac{T}{4}-\frac{\pi }{2})

I=0 A

At t=T/2

I=I_osin(\frac{2\pi }{T}\times \frac{T}{2}-\frac{\pi }{2})

I=I_o

It means that this not a indutor.

<u>For capacitor:</u>

I=I_osin(wt+\frac{\pi }{2})

At T/4, I=0

At t=T/2

I=I_osin(\frac{2\pi }{T}\times \frac{T}{2}+\frac{\pi }{2})

I= -I_o

This satisfy the above given condition so we can say that this capacitor.

6 0
4 years ago
Avogadro‘s number was calculated by determining The number of atoms in
Lady_Fox [76]

Answer:

12 grams of the isotope carbon-12.

Explanation:

hope it helps you and give me a brainliest

7 0
2 years ago
Which feature in this graph represents:
Rom4ik [11]

Answer:

almost 100% positive its B but dont take me up on it

3 0
3 years ago
What is the relationship between potential and kinetic energy in chemical reactions?
astraxan [27]

Answer:

2 and 3

Explanation:

because that's how kinetic and potential energy work

3 0
3 years ago
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