Answer:
mass number of 38
Explanation:
Charge is 0 - No. of protons is equal to nom.of electrons, so no charge
Atomic number is 18 - Atomic number is number of protons
Mass number is 38- mass number is number of protons AND neutrons
Answer:
a mass number of 38
Explanation:
X This atom has no a negative charge .
because, number of protons (18) & electrons (18) are same. so,This atom is neutral.
X This atom has an atomic number of 20.
Because, it has 18 protons. so, This atom has an atomic number of 18.
X This atom has a positive charge
because, number of protons (18) & electrons (18) are same.so,This atom is neutral.
Example of biochemical sedimentary rock
Answer:
There are lots of examples of Biochemical Sedimentary rock. Some are:
→Limestone
→Chalk
→Coal
→Phosphorite
→Etc...
hope this helps
and ur welcm
:)
A student pushes a box with a total mass of 50 kg. What is the net force on the box
if it accelerates 1.5 m/s2?
51.5 N.
48.5 N
75N
33.3 N
Answer:
75 N
Explanation:
Apply Newton's second law:
∑F = ma
∑F = (50 kg) (1.5 m/s²)
∑F = 75 N
A 60 kg box is pushed horizontally across the floor a distance of 20 meters. The force required is 15 N. In this effort, how many joules of work are done?
Answer: 300 J
Explanation:
The Work [tex]W[/tex] done by a Force [tex]F[/tex] refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path with distance [tex]d[/tex].
When the applied force is constant and the direction of the force and the direction of the movement are parallel, the equation to calculate it is:
[tex]W=(F)(d)[/tex] (1)
Where:
[tex]F=15 N[/tex]
[tex]d=20 m[/tex]
[tex]W=(15 N)(20 m)[/tex] (2)
[tex]W=300 Nm=300 J[/tex] (3) This is the Work (taking into account [tex]1J=(1N)(1m)=Nm[/tex] )
what is the average speed of (a) a car that travels 400m in 20s. and (b) an athlete who runs 1500m in 4 minutes
Final answer:
The car's average speed is 20 m/s or 72 km/h, whereas the athlete's average speed is 6.25 m/s or 22.5 km/h. To convert from m/s to km/h, we multiply by 3.6.
Explanation:
Average Speed Calculation
To calculate the average speed of a car that travels 400m in 20s, you divide the total distance by the total time. The formula is:
Average speed = Total distance / Total time
Thus, the car's average speed is 400m / 20s = 20 m/s.
For the athlete who runs 1500m in 4 minutes (which is 240 seconds), the calculation is similar:
Average speed = 1500m / 240s = 6.25 m/s.
To convert the average speed to km /h, we need to convert meters per second to kilometers per hour. The conversion factor is 3.6 (since there are 3600 seconds in an hour and 1000 meters in a kilometer). Hence:
Car: 20 m/s * 3.6 = 72 km/h
Athlete: 6.25 m/s * 3.6 = 22.5 km/h
Matter is lost when a candle is
burned.
True or False?
Answer:
false
Explanation:
Answer:
False
Explanation:
Matter is neither created nor destroyed. When a candle is burned, the wax reacts with oxygen to produce carbon dioxide and water vapor. The matter isn't destroyed, it's merely changed.
Which list correctly identifies each particle?
Answer:
x represents an electron and y represents a proton and a neutron.
Explanation:
electrons are the smallest particle in an atom and protons and neutrons are a lot larger. thats why only protons and neutrons are weighed in atomic mass. electrons are too small to make a difference in the atom's weight.
They want you to pick choice-A , but the whole question is poor and misleading.
The picture sorta kinda roughly presents the concept of the difference in MASSES ... one proton or one neutron has as much mass as about 1,840 electrons.
But things get very complicated on the scale of atoms and their components, and there's actually no such simple concept as the physical SIZE of any of these particles.
If ya wanna be absolutely technically correct, the picture is absurd, and the question has no answer.
what mass of water in grams will fill a tank 100 cm long, 50 cm wide, and 30 cm high
Answer: 150000 g
Explanation:
Firstly, we need to calculate the volume of the tank [tex]V_{tank}[/tex]:
[tex]V_{tank}=(length)(width)(height)[/tex]
[tex]V_{tank}=(100 cm)(50 cm)(30 cm)=150000 cm^{3}[/tex] (1)
Now, [tex]V_{tank}[/tex] is the volume that has to be filled with water, this means the volume water occupies in the tank [tex]V_{water}[/tex] must be equal to the volume of the tank:
[tex]V_{water}=V_{tank}=150000 cm^{3}[/tex] (2)
On the other hand, the density of water [tex]\rho_{water}[/tex] is [tex]1 g/cm^{3}[/tex] and establishes the relation between its mass [tex]m_{water}[/tex] and its volume [tex]V_{water}[/tex]:
[tex]\rho_{water}=\frac{m_{water}}{V_{water}}[/tex] (3)
Clearing [tex]m_{water}[/tex]:
[tex]m_{water}=\rho_{water} V_{water}[/tex] (4)
[tex]m_{water}=(1 g/cm^{3})(150000 cm^{3})[/tex] (5)
Finally:
[tex]m_{water}=150000 g[/tex]
A machine lifts a 1000 N object 40 meters in 15 seconds. How much work is done by the machine
Answer:
40000 J or 40 kJ
Explanation:
Work is the net force times the distance.
W = Fd
W = (1000 N) (40 m)
W = 40000 J
Notice that the time doesn't affect the amount of work done.
Which part of a feedback mechanism is able to monitor the conditions outside of cells and usually uses nerve cells to relay this information to an integrating center?
A.) sensor
B.) effector
C.) stimulus
D.) response
Answer: A.) sensor
Explanation:
Homeostasis is the ability of the organism's inner body to regulate the internal environment in stable state with respect to the changes occurring in the external environment. It is usually done by the feedback controls.
The maintenance of homeostasis within the body is essential. The following are the factors which controls the homeostasis. These includes:
1. Stimulus: It generate a response. It is an external factor which brings change in the internal body of the organism.
2. Receptor/ sensor: It detects the external stimulus and responds to the change.
3. Control center: The information from the receptor travels along the afferent pathway towards the control center. The function of the control center is to determine the response and controls the action.
4. Effector: The information from the control center travels down the efferent pathway to the effector. The function of the effector is to balance the stimulus to regulate and maintain homeostasis.
How does balance work?
(Mass can be measured by mass.)
Answer:
2) Mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter. Weight is measured on a scale. 3) The Mass of an object doesn't change when an object's location changes. Weight, on the other hand does change with location.
Explanation:
2) How many significant figures are in the number 0.0037010?
Final answer:
The number 0.0037010 contains six significant figures, with the leading zeros serving as placeholders and therefore not significant. The significant figures are the digits 3, 7, 0, 1, 0.
Explanation:
The number 0.0037010 has six significant figures. In this number, the leading zeros are not counted because they serve only as placeholders for the decimal point. The significant figures begin with the first nonzero digit; therefore, the significant figures in this number are 3, 7, 0, 1, 0 (including the trailing zero because it is to the right of the decimal point and in a number that contains other significant figures).
When using exponential notation to express a number, like expressing 0.0037010 as 3.7010 × 10-3, it becomes clearer that all digits in the number 3.7010 are significant, and the exponent simply locates the decimal point.
Special consideration for zeros is important in significant figures. Any zero that is to the right of the decimal point and to the right of a nonzero digit is a significant figure. This is an essential concept in measurements and scientific notation for clarity and precision.
B. You are approaching a stoplight moving with a velocity of 42.0 m/s. The light turns
yellow, and you apply the brakes and skid to a stop. If your acceleration is 10.0 m/s2,
determine the displacement of the car during the skidding process
Answer:
Time needed is 2.5 seconds. The distance covered is 31.3 m
Explanation:
Answer:
displacement of the car will be 88.2 m
Explanation:
As we know that initial speed of the car is given as
[tex]v_i = 42 m/s[/tex]
after complete stop the final speed of the car is
[tex]v_f = 0[/tex]
now the deceleration caused due to applied brakes is given as
[tex]a = 10 m/s^2[/tex]
now by kinematics we will have
[tex]v_f^2 - v_i^2 = 2 a d[/tex]
[tex]0 - 42^2 = 2(-10)d[/tex]
[tex]d = 88.2 m[/tex]
Based on the image, what is the mass of the object being measured?
Triple beam balance
A. 500.10 grams
B. 501.00 grams
C. 510.0 grams
D. 600 grams
Answer: OPTION B
Explanation:
The Triple beam balance is a device you can use to measure masses very precisely.
A Triple beam balance has three different beams. Obseve in the figure that:
The beam located at the bottom has a 10-gram scale and a 0.1-gram slider. The middle beam has a 500-gram scale and a 100-gram slider. The beam located at the top has a 100-gram and a 10-gram slider.
In this case you can see that:
In the middle beam the 100-gram slider is on 500 grams. In the beam located at the top the 10-gram slider is on 0 grams. In the beam located at the bottom the 0.1-gram slider. is on 1 gram.Therefore, the mass of the object being measured is:
[tex]m=500.00\ gr+0\ gr+\ 1.00\ gr\\\\m=501.00\ gr[/tex]
((PLEAASSEE HELP ME)) A ray diagram is shown.
Which letter represents the location of the image produced by the lens?
W
X
Y
Z
Answer:
W is the answer
Explanation:
Answer: the answer is X
Explanation: the image formed by a diverging or concave lens is always virtual, erect and diminished. The image formed is on the same side as the object and always between the object and the lens. From the diagram above, X is in between object (w) and the lens
Without being able to look into the earth , a scientist would not be able to determine if this region has karst topography
True or False
Answer: False
Explanation: They can see it by karst topography!
Explanation:
Karst topography can be observed by looking into the earth’s external surface structures like barren rocky grounds, caves, underground rivers, sinkholes and other karst landscapes. Karst topography results due to erosion of limestone by the excavation of underground water. When rainwater erodes the soft rocks like limestone it begins to slowly dissolve in water. Over repeated erosion, only the rocky cliffs remain on the surface. When an underground river emerges from sinkholes in a karst landscape, the rocky remains form caves. So by studying these external surfaces itself, the scientist can determine if a region has karst topography
WORTH 50 POINTS!!!! PLZ HELP ME!! ASAP!!
Measuring: Liquid Volume Write your answers to the questions below in the spaces provide. If you need more space, use the back of this sheet. The volume of an object is the amount of space it takes up. You will often measure the volume of liquids using a graduated cylinder. (“Graduated” means that the cylinder is marked with measurement units.) Always read a graduated cylinder at eye level. Also, water in a graduated cylinder has a curved surfaces called the meniscus. Read the volume at the bottom of the meniscus. Hints: Always check the unnumbered marks on a graduated cylinder to see how many sections there are and what they measure. Also, sometimes you have to estimate a measurement between two marks. Prove to yourself that both graduated cylinders on the right contain 25 mL. What is the volume of the liquid shown in graduated cylinders 1-4 below? What is the total volume in graduated cylinder 5? 6. If the diagrams for questions 4 and 5 show the same graduated cylinder before and after the rock was added, what can you infer about the volume of the rock? ______________________________________________________________________________ 7. Think About It Describe how you can use a graduated cylinder to measure the volume of an irregular object.
Answer:
27.0
Explanation:
The mass of an object was measure on a balance and reported as 65.35g and it displaced 3.4ml. What is the density of the object
Answer: 19.220g/ml
Explanation:
An object having a mass of 65.35g and a volume of 3.4 ml will have a density of 19.220g/ml.
Given, the mass of the object is 65.35g and the volume displaced by it(which is equivalent to the volume of the object) is 3.4ml.
we know,
[tex]$density=\frac{mass}{volume}[/tex]
hence,
[tex]$density=\frac{65.35}{3.4}g/ml=19.220g/ml$\\\\[/tex]
Hence, the Density of the object is 19.220g/ml
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Which of the following would be an example of an independent variable?
THE OPTIONS ARE
1.RAINFALL
2.POPULATION
3.YEAR
4.INCOME
Answer:
Year
Explanation:
Answer:
year
Explanation:
from homeschool
If you were trying to describe the difference between power and work you could say...?
In physics, 'work' refers to the energy transfer that occurs when a force moves an object, while 'power' refers to the rate at which work is done or energy is transferred.
Explanation:In the realm of physics, work and power are two related, but distinctly different concepts. Work is essentially an energy transfer that occurs when an external force moves an object or system through a distance. For instance, you do work when you lift a box off the floor.
On the other hand, power is the rate of doing work or the rate of energy transfer. It measures how quickly work is done or energy is transferred. For instance, a powerful car engine can do a lot of work in a short amount of time.
The formal equation for power is P = W/t, with P representing power, W representing work, and t representing time. Power units are joules per second, also known as watts. A real-world example of this concept would be a 60-W lightbulb, which expends 60 J of energy per second.
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Drag each statement to the correct location on the chart. Classify the events as being a cause or an effect of pollution. urbanization oil spill smog desertification deforestation leaky landfill contaminated water
Answer:
Urbanization, oil spill, leaky landfill and deforestation are causes of pollution while desertification, smog, contaminated water are the effects of pollution.
Explanation:
Urbanization is generally associated with an increase in the number of industries. The waste materials in different forms from the factories pollute air, water and soil.
The effluents from factories released into rivers cause water pollution and harm the aquatic life. Water contaminated by industrial waste becomes unsuitable for drinking. Forests play a major role in controlling the amount of carbon dioxide in the atmosphere.
Deforestation increases the amount of carbon dioxide in the atmosphere. Oil spills usually occur in oceans and seas and it causes water pollution and threatens aquatic life.
Answer:
Cause
industrial wastes dumped into rivers
oil spilled on land mixes with runoff
sewage dumped into rivers
Effect
destroyed natural habitats
fish die-off
spread of disease
Explanation:
plato
(II) A 20.0-kg box rests on a table. (a) What is the weight of the box and the normal force acting on it? (b) A 10.0-kg box is placed on top of the 20.0-kg box, as shown in Fig. 4–43. Determine the normal force that the table exerts on the 20.0-kg box and the normal force that the 20.0-kg box exerts on the 10.0-kg box.
*Fig is Attached with answer*
Answer:
(a) Weight = Normal Force = 196.2 N
(b) Normal force table on 20 kg box = 294.3 N
Normal force 20 kg box on 10 kg box = 98.1 N
Explanation:
(a) Mass = m = 20 kg g = 9.81 m/s²
Weight = w = mg
w = 20 × 9.81
w = 196.2 N
As the box rests on the table so, normal force (NF) must be equal to the weight of the box.
NF = w = 196.2 N
(b)
m₁ = 20 kg m₂ = 10 kg
total mass = M = 30 kg
Total Weight = W = Mg
= 30 × 9.81
= 294.3 N
As both the boxes rest on the table so, normal force (NF) must be equal to the total weight of the boxes.
NF = W = 294.3 N
Weight of 10 kg box = 10 × 9.81 = 98.1 N
As the 10 kg box is placed on the top of 20 kg box, So 20 kg box must exert a normal force that is equal to the weight of 10 kg box.
Normal Force = Weight of 10 kg box = 98.1 N
The normal force acting on the body is equal to its weight, hence;
N = W = 196N
The normal force that the 20.0-kg box exerts on the 10.0-kg box is 98N
The formula for calculating the weight of an object is expressed as:
W = mg
m is the mass of the object
g is the acceleration due to gravity.
Given the following parameters
Mass of the box = 20.0kg
a) The weight of the box = 20 * 9.8
Weight of the box = 196N
Hence the weight of the box is 196N
Note that the normal force acting on the body is equal to its weight, hence;
N = W = 196N
b) if a 10.0-kg box is placed on top of the 20.0-kg box, the total mass will be;
M = 10 + 20 = 30kg
total weight = 30 * 9.8
Total weight = 294N
Since the normal force is equal to the weight, hence W = N = 294N
Weight of the 10kg box = 10 * 9.8 = 98N
Since the 10kg box is on top of the 20kg box, hence the normal force that the 20.0-kg box exerts on the 10.0-kg box is 98N
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A skater starts from rest and accelerates to 5 m/s in 4.5 s. How far did the travel in this time period?
(there is no answer choices)
Answer:
11.25 m
Explanation:
Given:
v₀ = 0 m/s
v = 5 m/s
t = 4.5 s
Find: Δx
Δx = ½ (v + v₀) t
Δx = ½ (5 m/s + 0 m/s) (4.5 s)
Δx = 11.25 m
Round as needed.
A helicopter’s speed increases from 30 m/s to 40 m/s in 5 seconds. What is the acceleration of this helicopter? m/s2
Answer:
The acceleration of this helicopter is [tex]2 m/s2[/tex]
Explanation:
In this question the velocity changes from 30 m/sto 40 m/s in 5 seconds.
Initial velocity u= [tex]30m/s[/tex]
Final velocity u= [tex]40m/s[/tex]
Time t= [tex]5s[/tex]
Acceleration is defined as the rate of change of velocity. It is given by the equation
[tex]a= \frac{v-u}{t}[/tex]
=[tex]\frac{40-30}{5}[/tex]
= [tex]\frac{10}{5}[/tex]
= [tex]2 m/s2[/tex]
All moving bodies aren’t necessarily accelerated. To be identified as accelerating, a body should have its velocity changing. Thus a body in uniform motion is not accelerating since its velocity is constant.
Answer:
A helicopter’s speed increases from 30 m/s to 40 m/s in 5 seconds.
What is the acceleration of this helicopter?
2
m/s2
Explanation:
Correct on egde
a fan acquires a speed of 180 rpm in 4s, starting from rest. calculate the speed of the fan at the end of the 5th second starting from rest. Assume angular acceleration to be uniform
Answer:
225 rpm
Explanation:
The angular acceleration of the fan is given by:
[tex]\alpha = \frac{\omega_f - \omega_i}{\Delta t}[/tex]
where
[tex]\omega_f[/tex] is the final angular speed
[tex]\omega_i[/tex] is the initial angular speed
[tex]\Delta t[/tex] is the time interval
For the fan in this problem,
[tex]\omega_i = 0\\\omega_f = 180 rpm\\\Delta t=4 s[/tex]
Substituting,
[tex]\alpha = \frac{180-0}{4}=45 rpm/s[/tex]
Now we can find the angular speed of the fan at the end of the 5th second, so after t = 5 s. It is given by:
[tex]\omega' = \omega_i + \alpha t[/tex]
where
[tex]\omega_i = 0\\\alpha = 45 rpm/s\\t = 5 s[/tex]
Substituting,
[tex]\omega' = 0 + (45)(5)=225 rpm[/tex]
Which variable is changed in an experiment?
A. The Stable Variable
B. The Graphing Variable
C. The Independent Variable
D. The Dependent Variable
Answer:The Independent Variable
Explanation: took the test
The table represents the speed of a car in a northern direction over several seconds. A 2-column table with 5 rows. The first column labeled Column 1 has entries 0, 2, 4, 6, 8, 10. The second column labeled Column 2 has entries 5, 10, 15, 20, 25, 30. Column 1 would be on the x-axis, and Column 2 would be on the y-axis. Which best lists the titles of each column? Column 1 should be titled “Time,” and Column 2 should be titled “Velocity.” Column 1 should be titled “Velocity,” and Column 2 should be titled “Time.” Column 1 should be titled “Time,” and Column 2 should be titled “Acceleration.” Column 1 should be titled “Acceleration,” and Column 2 should be titled “Time.”
Answer:
Column 1 should be titled “Time,” and Column 2 should be titled
“Velocity.” ⇒ 1st answer
Explanation:
* Lets revise some definitions of graphs
A velocity-time graph represents the speed and direction an object
travels over a period of time.
Velocity-time graph is called speed-time graph.
The vertical axis of a velocity-time graph represents the velocity of the
object and horizontal axis represents the time from the initial position
In an acceleration time graph y-axis represents the acceleration, and
x-axis represents the time
The table represents the speed of a car in a northern direction over
several seconds
That means the data in the table represent the velocity of the car in a
certain time
Time (s) Velocity (m/s)
0 5
2 10
4 15
6 20
8 25
10 30
Column 1 would be on the x-axis
x-axis represents the time
Column 2 would be on the y-axis
y-axis represents the velocity
Column 1 should be titled “Time,” and Column 2 should be titled
“Velocity.”
Answer:
the answer is A because i took the test
Explanation:
Are there human health risks from exposure (or overexposure) to gamma radiation?
Answer:
yes
Explanation:
Chemical rock formed by crystallization
of excess dissolved minerals
Answer:
heyooo!!!
Sedimentary
hope this helps!!
Explanation:
When the sediments harden, the layers are preserved. Sedimentary rocks formed by the crystallization of chemical precipitates are called chemical sedimentary rocks.
Answer: Chemical sedimentary rocks.
Explanation: Those may be a type of sedimentary rocks called "chemical sedimentary rocks". This type of rock forms when mineral constituents in solution become supersaturated and inorganically precipitate. Formed by deposit of dissolved substances, were the largest volume corresponds to masses of salts accumulated by supersaturation of seawater. When seawater is stagnant, it begins to evaporate and dissolved minerals precipitate, this process gives rise to evaporites, for example gypsum and gem salt.
The linear, step wise representation of the process of science from the traditional scientific method, while simplified, does capture the core logic of science: testing ideas with evidence.
1.)True
2.)False
Answer:
False
Explanation:
6. What percentage of water on Earth is used for drinking, household needs, community needs,
and crop irrigation?
01%
2%
03%
06%
Answer: Option C: 0.3%
Explanation: The Earth has an abundance of water, but unfortunately, only a small percentage, is even usable by humans. The other 99.7 percent is in the oceans, soils, icecaps, and floating in the atmosphere and the other 0.3% can be used.
So the correct option would be C: 0.3%