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3 years ago

YOU GUYSS SHOULD HELPP ME WITH THISSS PLSSS I SHOULDD SUBMIT IT TOMORROW PLSSSSSSSSSS HELPPP!!

Physics

1 answer:

zhenek [66]3 years ago

8 0

Answer:

2 m and 6.25 m for a and b respectively

Explanation:

Acceleration (a) = (2-0)/2 = 1 ms^-2 for first 2s

Distance = u*t + 0.5 *a*t^2

= 0 * 2 + 0.5 * 1 * 2^2

= 2 m

btn 2 and 4s

Acceleration a = (2.5-2)/2 = 0.25 ms^-2

Distance = u*t + 0.5 *a*t^2

=2*2+0.5 *0.25*2^2

= 4.5 m

btn 4 and 5s

Acceleration a = (1-2.5)/1 = -1.5 ms^-2

Distance = u*t + 0.5 *a*t^2

= 2.5*1 + 0.5 * -1.5*1^2

= 1.75 m

Total distance Btn 2 and 5s = 4.5 + 1.75 m

= 6.25 m

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100 g of Ice at -10°C is added into a

Andrei [34K]

Answer:

The mass of the juice responsible for melting the ice is 949.043 grams.

Explanation:

By the First Law of Thermodynamics, we understand that juice releases heat to the ice, which turns into water under the assumption that interactions between the ice-juice system and surroundings are negligible and energy processes are done in steady-state. Since juice is done with water, its specific heat will be taken as of the water. The process is described by the following formula:

$m_{i} \cdot [c_{i}\cdot (T_{1}-T_{2}) - L_{f} + c_{w}\cdot (T_{2}-T_{3})] + m_{w} \cdot c_{w}\cdot (T_{4}-T_{3}) = 0$ (1)

Where:

$m_{i}$ - Mass of ice, in grams.

$m_{w}$ - Mass of the juice, in grams.

$c_{i}$ - Specific heat of ice, in joules per gram-degree Celsius.

$c_{w}$ - Specific heat of water, in joules per gram-degree Celsius.

$L_{f}$ - Latent heat of fusion, in joules per gram.

$T_{1}$ - Initial temperature of ice, in degrees Celsius.

$T_{2}$ - Melting point of water, in degrees Celsius.

$T_{3}$ - Final temperature of the ice-juice system, in degrees Celsius.

$T_{4}$ - Initial temperature of the juice, in degrees Celsius.

If we know that $m_{i} = 100\,g$ , $c_{i} = 2.090\,\frac{J}{g\cdot ^{\circ}C}$ , $c_{w} = 4.18\,\frac{J}{g\cdot ^{\circ}C}$ , $L_{f} = 334\,\frac{J}{g}$ , $T_{1} = -10\,^{\circ}C$ , $T_{2} = 0\,^{\circ}C$ , $T_{3} = 10\,^{\circ}C$ and $T_{4} = 20\,^{\circ}C$ , then the mass of the juice is:

$m_{w} = \frac{m_{i}\cdot [c_{i}\cdot (T_{1}-T_{2}) - L_{f} + c_{w}\cdot (T_{2}-T_{3})]}{c_{w} \cdot (T_{3}-T_{4})}$

$m_{w} = \frac{(100\,g)\cdot \left[\left(2.090\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (-10\,^{\circ}C) - 334\,\frac{J}{g} +\left(4.18\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (-10\,^{\circ}C) \right]}{\left(4.180\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (-10\,^{\circ}C)}$

$m_{w} = 949.043\,g$

The mass of the juice responsible for melting the ice is 949.043 grams.

5 0

3 years ago

There are 92 naturally occurring elements. How does this relate to the number of compounds?

raketka [301]

C) Elements combine in different ways to create many more than 92 compounds.

Explanation:

The number of elements we have relates to the compound formation in that, elements combine in different ways to create many more than 92.

Elements are distinct substances that cannot be split up into simpler substances. Such substances are only made up of one kind of atom.

Compounds are substances that are made up of two or more kinds of atoms joined together in a definite grouping.

Several millions of compounds are known because elements can combine in different ways.
The number of elements do not increase because new elements are discovered, it is because elements have several ways by they combine.

Learn more:

Chemical reactions brainly.com/question/3953793

#learnwithBrainly

3 0

4 years ago

Entropy is a measure of the _____ of a system. thermal energy mechanical energy disorder density

valina [46]

The answer is disorder. It would be really hard to explain without being too complicated, but the entropy is the number of possible states that a system can realize under given conditions.

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3 years ago

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The process of evaluating evidence to form an attitude is called

tatyana61 [14]

The process of evaluating evidence to form an attitude should be called Cognitive evaluation.

5 0

3 years ago

Which statement best describes a wave?

Leto [7]

Answer:

B.) A disturbance that carries energy

Explanation:

The complete statement that describes a wave would be :

A wave is a disturbance that carries energy from one place to another

Other listed options are incorrect because:

Incorrect : A.) A collision of particles ---------> Conduction

Incorrect : C.) A movement of fluids ----------> Convection

Incorrect : D.) A group of electrically charged molecules ----------> Radiation

[ Correct on Edgenuity ]

Hope this helps you have a better understanding ! :D

Have a wonderful day !

3 0

3 years ago

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