Answer:
a) Qh= 6750 kJ
b) e = 0.296
c) = 390.625° C
Explanation:
Given:
Work done, W = 2000 kJ
Heat flow, Q = 4750 kJ
Temperature at which heat flows out, = 275° C
a) Now, the heat flow through the engine (Qh)
Qh = W + Q
or
Qh = 2000 + 4750
or
Qh= 6750 kJ
b) The efficiency (e) is given as:
on substituting the values, we get
or
e = 0.296
c)
where,
is the temperature at which heat flow
on substituting the values, we get
or
= 390.625° C
Recall that the force on an object is related to the mass and acceleration of that object by the formula F = ma, where m is the mass of the object and a is its acceleration. What happens when we double F? Well, you might remember from algebra that, in order to keep our equality true, if we double one side, we must also double the other, so our equation becomes 2F = 2ma. Now, this means one of two things: either the mass has doubled, or the acceleration has doubled.
We can tell right away that it'd be absurd if a race car doubled in mass every time it hit the gas, so the quantity doubling must be the <em>acceleration. </em>If we call the car's current velocity v1, we'll be adding the doubled acceleration to get its new velocity. Mathematically, v = v1 + 2a.
We can now conclude that, by doubling the force:
- The acceleration of the car will double,
- The mass of the car will stay the same, and
- The velocity of the car will increase by double the original acceleration
Answer:
Doppler radar is very useful for determining the presence of a tornado.
Explanation:
Doppler radar is the special type of radar that uses the principal of Doppler effect to find velocity about the object at any distance. It can be used for many purpose like radar gun, aviation, on air weather etc.
Thus, It can also determine the presence of tornado.
Field at the center is zero because net electric field on the surface is same.
Water=hydrosphere
wind=atmosphere
ice=cryosphere
organisms=biosphere
I think!!