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dem82 [27]
3 years ago
10

You pour 250 g of tea into a Styrofoam cup, initially at 80∘C and stir in a little sugar using a 100-g aluminum 20∘C spoon and l

eave the spoon in the cup. Assume the specific heat of tea is 4180 J/kg⋅∘C and the specific heat of aluminum is 900 J/kg⋅∘C. Part APart complete What is the highest possible temperature of the spoon when you finally take it out of the cup?
Physics
1 answer:
jok3333 [9.3K]3 years ago
3 0

To solve this problem it is necessary to apply the concepts related to the conservation of energy and heat transferred in a body.

By definition we know that the heat lost must be equal to the heat gained, ie

Q_g = Q_l

Where,

Q = Heat exchange

The heat exchange is defined as

Q = c_p m \Delta T

Where,

c_p = Specific heat

m = mass

\Delta T= Change in Temperature

Therefore replacing we have that

Q_g = Q_l

c_{p-tea} m \Delta T =  c_{p-al} m \Delta T

Replacing with our values we have that

0.25*4180*(80-T) = 0.1*900*(T-20)

11.61*(80-T) = T-20

T= \frac{948.8}{11.61}

T = 75.24\°C

Therefore the highest possible temperature of the spoon when you finally take it out of the cup is 75.24°C

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Based on its surface features, the most important event on Venus in the past billion years or so was _______.a) the eruption of
ira [324]

Answer:

Correct answer is (c) a global "repaving" that erased essentially all the surface features that had existed earlier

Explanation:

Venus underwent cyclic process which erased the proved of other craters about billion years back. This is termed Venus global resurfacing event.

4 0
3 years ago
If a velocity is positive which would most likely yield a negative acceleration
Aleksandr [31]

Answer:

A time that is less than half an hour

Explanation:

it says velocity is positive so it would yield to a negative acceleration

5 0
3 years ago
A horse pulls a cart along a flat road. They start from rest and as time goes on their speed increases. Consider the following f
Anna11 [10]

Answer:

Forces 1 and 2 cannot have equal magnitudes.

Force 1 exceeds force 2.

Explanation:

Numbering the given statements:

  1. The force of the horse pulling on the cart.
  2. The force of the cart pulling on the horse.
  3. The force of the horse pushing on the road .
  4. The force of the road pushing on the horse.
  • When a horse pulls a cart along a flat road starting from the state of rest, the horse applies a force on the ground in downward-back direction diagonally and as its reaction it moves forward. During this action there is also a reaction force by the road on the horse which exceeds the force of the horse on the ground and as a result the horse moves forward.
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5 0
3 years ago
Spinning situations???
Papessa [141]
Just like mass, energy, linear momentum, and electric charge, angular momentum is also conserved.

The wheel has angular momentum.  I don't remember whether it's
up or down (right-hand or left-hand rule), but it's consistent with
counterclockwise rotation as viewed from above.

When you grab the wheel and stop it from spinning (relative to you),
that angular momentum has to go somewhere.

As I see it, the angular momentum transfers through you as a temporary
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of (merry-go-round) + (you) + (wheel) is rotating around the big common
axis, counterclockwise as viewed from above, and with the magnitude
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7 0
3 years ago
Read 2 more answers
Select the true statements: check all that apply check all that apply oxidizing agents can convert co into co2. a reducing agent
andrew11 [14]

Answer:

1.) True

2.) True

3.) False

Explanation:

1.) Oxidizing agents can convert co into co2.

This is true

Carbon monoxide burns in the oxygen to produce carbon dioxide

2.) A reducing agent gets oxidized as it reacts.

This is true

Because it loses electrons and is oxidized in a chemical reaction. 

3.) If something is reduced, it is formally losing electrons.

This is false.

If something is reduced, it is gaining electrons.

7 0
3 years ago
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