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3 years ago

13

Which statement about the physical change of liquid water boiling into steam is true?

2 answers:

vekshin13 years ago

6 0

Answer:

(A). The heat added represent an energy change.

Explanation:

When liquid water in changed in to steam, energy change occurs as the heat given to the water helps the molecules to go farther away thus changing its physical state from liquid to steam.

This stored energy in the water molecules rises in form of vapor or steam hence energy change occur, this energy change helps in breaking the bond between the molecules thus setting them free.

taurus [48]3 years ago

3 0

A. the heat added represents an energy change

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Why does ice melt faster in water than in oil when both liquids are at the same temperature

vekshin1

Water has a high specific heat capacity. Oil has a smaller heat capacity.

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2 years ago

Read 2 more answers

A jet aircraft is traveling at 262 m/s in hor-

NeTakaya

Solution :

Speed of the air craft, $S_a$ = 262 m/s

Fuel burns at the rate of, $S_b$ = 3.92 kg/s

Rate at which the engine takes in air, $S_{air}$ = 85.9 kg/s

Speed of the exhaust gas that are ejected relative to the aircraft, $S_{exh}$ =921 m/s

Therefore, the upward thrust of the jet engine is given by

$F=S_{air}(S_{exh}-S_a)+(S_b \times S_{exh})$

F = 85.9(921 - 262) + (3.92 x 921)

= 4862635.79 + 3610.32

= $4.8 \times 10^6 \ N$

Therefore thrust of the jet engine is $4.8 \times 10^6 \ N$ .

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2 years ago

Would a ship in Lake Ontario (fresh water) float higher or lower in the water than in the Atlantic Ocean (salt water)?

ohaa [14]

Atlantic Ocean (salt water)

8 0

2 years ago

One cycle of the power dissipated by a resistor ( R = 800 Ω R=800 Ω) is given by P ( t ) = 60 W , 0 ≤ t < 5.0 s P(t)=60 W, 0≤

OLga [1]

Answer:

42.5W

Explanation:

To solve this problem we must go back to the calculations of a weighted average based on the time elapsed thus,

$Power_{avg} = \frac{P_1(t_1)+P_2(t_2)}{t_1+t_2}$

We need to calculate the average power dissipated by the 800\Omega resistor.

Our values are given by:

$P(t)=60 W, 0\leq t$

$P(t)=25 W, 5.0\leq t$

Aplying the values to the equation we have:

$Power_{avg} = \frac{P_1(t_1)+P_2(t_2)}{t_1+t_2}$

$Power_{avg} = \frac{60(5-0)+25(10-5)}{(5-0)+(10-5)}$

$Power_{avg} = 42.5W$

5 0

2 years ago

An increase in speed or velocity can be described as:

rodikova [14]

Answer:

acceleration

rhymes with accelerator

Explanation:

the increase/decrease or the sudden change in speed and direction of object

7 0

2 years ago