As objects convert energy, some energy is converted into unwanted energy that is not needed. true or false?

Directions: Perform the Assessment in Module 7 because that will serve as your Performance Task for Module 5, 6 & 7. Kindly

garik1379 [7]

please put your question completely....

8 0

3 years ago

Elements occur in a number of isotopic forms. In this problem, you will learn about the notation used to distinguish different i

alina1380 [7]

Answer:

Number of protons, Z = 14
Number of neutrons, N = 14

Explanation:

1) About isotopes:

Isotopes are different kind of atoms of the same element. Hence, they have the atomic number (Z), which is the number of protons, the same number of electrons (talking about to neutral atoms, not ions), and different number of neutrons N).

This is, it is the number of neutrons what distinguish different isotopes of an element.

2) About the notation used to distinguish different isotopes:

A superscript and a subscript, both to the left of the chemical symbol of the element, are used to distinguish different isotopes:

A ←------------- This superscript tells the mass number of the isotope

X ←--------- This is the chemical symbol of the element

Z ←-------------- This subscript is the atomic number of isotope

In our case, the notiation for the isotope of silicon is: ²⁸₁₄ Si

So, we have:

28 is the mass number (A)
14 is the atomic number (Z)
Si is the chemical symbol.

Now, you can answer the questions of the part A:

Number of protons: Z = 14

Number of neutrons N:

mass number = number of protons + number of neutrons

A = Z + N

⇒ N = A - Z = 28 - 14 = 14

In conclusion:

Number of protons, Z = 14
Number of neutrons, N = 14

5 0

4 years ago

Three children are playing in a pool in the back yard. One child is at the far left end of the pool and is splashing. A second c

torisob [31]

The answer is; D

When both kids splash at both ends of the pool, the waves formed from the different direction travel and meet in the middle of the pool (since they are traveling with the same speed). When the waves meet, they interact and form constructive waves. This means that when a crest meets a crest, the height doubles. This also occurs for the troughs. Therefore the sizes of the waves at the middle are twice the individual waves.

6 0

3 years ago

Read 2 more answers

What what is the equation for percent error

Stella [2.4K]

When you calculate results that are aiming for known values, the percent error formula is useful tool for determining the precision of your calculations. The formula is given by: The experimental value is your calculated value, and the theoretical value is your known value.

5 0

3 years ago

Metabolic activity in the human body releases approximately 1.0 x 104kJ of heat per day. Assuming the body is 50 kg of water, ho

Zarrin [17]

Answer:

The body temperature would rise by 47.85 °C

The amount of water the body evaporates is 4.15 kg.

This makes sense because firstly the value obtained is positive then secondly it is a normal occurrence in the real world that in a place where the temperature is high the body usually produce sweat in order to balance its internal temperature

Explanation:

Considering the relationship (between the heat released and the mass of the object) as shown below

q = msΔT

where q is the heat released per day = $1.0 * 10^{4} kJ$

m is the mass of the body = 50 kg

ΔT is the temperature rise = ?

s is the specific heat of water = $4,18kJ/kg^{o} C$

substituting values we have

$1.0 * 10^{4} kJ$ = $(50kg) (4.18kJ/kg^{o}C )$ ΔT

ΔT = $\frac{1.0 * 10^{4}kg}{(50kg)(4.18kJ/kg^{o} C)}$

= 47.85°C

To maintain the normal body temperature (98.6F = 37°C) the amount of heat released by metabolism activity must be utilized for evaporation of some amount of water

Hence

$Amount of water that must be evaporated =\frac{heat released per day}{heat of vaporization of water}$

$= \frac{1.0* 10^{4}kJ}{2.41kJ/g} \\= 4149.38g\\=4.15kg$

Note (1 kg = 1000 g)

This makes sense because firstly the value obtained is positive then secondly it is a normal occurrence in the real world that in a place where the temperature is high the body usually produce sweat in order to balance its internal temperature

7 0

3 years ago