Answer:
60
Explanation:
because it shows he is moving at a low speed
Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many neutrons does potassium have?
19
58
20
39
Answer:
20
Explanation:
Atomic number is same as the number of protons of an atom and atomic mass is equal to the sum of number of protons and number of neutrons of an atom.
Atomic number = 19
So, number of protons (p) = 19
Atomic mass = 39
So, sum of number of neutrons and number of protons (n + p) = 39
Number of neutons (n)
= (n + p) - p
= 39 - 19
= 20
Potassium’s atomic number is 19, and its atomic mass is approximately 39, then Potassium would have 20 neutrons present inside its nucleus, therefore the correct answer is option C.
What is the atomic number?The total number of protons present in an atom is known as the atomic number of that atom. The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.
While the atomic mass of an atom is the sum of the total number of protons and the number of neutrons present inside of any atom.
atomic number= total number of protons
atomic mass = total number of protons + total number of the neutrons
As given in the problem Potassium’s atomic number is 19, this means Potassium has 19 protons
Potassium has an atomic mass of about 39
39 = total number of protons + total number of the neutrons
39 = 19 + total number of the neutrons
total number of the neutrons = 39-19
=20
Since potassium has an atomic mass of about 39 and an atomic number of 19, it would have 20 neutrons in its nucleus. Option C is the right response.
Learn more about the atomic number from here
brainly.com/question/14190064
#SPJ5
Trey is testing a properly working resistor in a circuit and finds its value to be far lower than he expects what’s a likely error
A. The resistor is faulty
B. The circuit is energized
C. He didn’t cut a lead on the resistor
D. The resistor is installed backwards
Which element does not have the same number of electrons in its outermost shell as the other elements in its group?(1 point)
hydrogen (H)
bromine (Br)
boron (B)
helium (He)
Answer:
The answer is helium (He)
Explanation:
Because helium is in the group 18, and the other elements of group 18 have 8 electrons in it's outermost, while helium just have 2 electrons
Helium (He) does not have the same number of valence electrons as other elements in its group.
The periodic table is divided into groups with the last number of the group coinciding with the number of electrons that an element in the group has in its outermost or valence shell.
Helium is in group 18 which means that it should have the same number of valence electrons as :
NeonArgonKryptonXenon and,RadonYet Helium only has 2 valence electrons. We can therefore conclusively say that Helium does not have the same number of valence electrons as other elements in its group.
More information is available at https://brainly.com/question/20944279.
write any two important of gravitational force?
Answer:
Explanation:
Gravitational force is important because:
1. because of the gravitational force of the earth, the atmosphere is present around its surface, which is crucial for sustainability of life on earth
2. we are able to perform motion due to the force of gravity
What is the importance of physics???
MAKE IT QUICK!!!
Answer:
Physics is the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms. And a more detailed working definition of physics may be: The science of nature, or that which pertains to natural objects, which deals with the laws and properties of matter and the forces which act upon them. Quite often, physics concentrates upon the forces having an impact upon matter, that is, gravitation, heat, light, magnetism, electricity, and others.
Physics helps us to understand how the world around us works, from can openers, light bulbs and cell phones to muscles, lungs and brains; from paints, piccolos and pirouettes to cameras, cars and cathedrals; from earthquakes, tsunamis and hurricanes to quarks, DNA and black holes. Physics helps us to organize the universe. It deals with fundamentals, and helps us to see the connections between seemly disparate phenomena.
Physics provides quantitative and analytic skills needed for analyzing data and solving problems in the sciences, engineering and medicine, as well as in economics, finance, management, law and public policy. Physics is the basis for most modern technology, and for the tools and instruments used in scientific, engineering and medical research and development. Manufacturing is dominated by physics-based technology.
To understand the fundamental principles of the universe, physics utilizes many workings from the other natural sciences. Because of this overlap, phenomena studied in physics (conservation of energy for example) are common to all material systems. The specific ways in which they apply to energy (hence, physics) are often referred to as the "laws of physics." Because each of the other natural sciences biology, chemistry, geology, material science, medicine, engineering, and others, work with systems which adhere to the laws of physics, physics is often referred to as the "fundamental science."
Answer:
Physics can be important in understanding the world and how it works. The main goal of physics is to understand how the universe behaves.
Explanation:
if the radius of a coin is 1 cm then calculate its area.
Answer:
3.14*1²
3.14 cm²
I hope this will help
Answer:
3.14 cm squared
Explanation:
I hope this will help.
what are the examples of Inertia of motion
Seat belts tighten in a car when it stops quickly.
Men in space find it more difficult to stop moving because of a lack of gravity acting against them.
When playing football, a player is tackled, and his head hits the ground.
EXAMPLES ARE GIVEN BELOW:
HOPE IT'S HELPFUL FOR U MATE
when an apple falls towards the earth the earth moves up to meet the apple. Is it true? If yes, why is the earth motion not noticeable ?
Answer:
Explanation:
The apple also exerts an equal and opposite force on the earth but earth does not move because the mass of apple is very small,due to which the gravitational force produces a large acceleration in it (a=F/m) and we can see the apple falling towards the earth but the mass of earth is very large,the same gravitational .
Please could someone help me?
Answer:
I) 18.75 m/s
ii) for 10 second
HELP!!
A particular electric car is supplied with 300 kJ of chemical energy by the battery. Of this, a total of 70.5 kJ of energy is wasted as heat.
Calculate the overall efficiency of the electric car.
[tex]\\ \sf\longmapsto 300-70.5=229.5kJ[/tex]
We know
[tex]\boxed{\sf Efficiency=\dfrac{Used\:Energy}{Supplied\:Energy}\times 100}[/tex]
[tex]\\ \sf\longmapsto Efficiency=\dfrac{229.5}{300}\times 100[/tex]
[tex]\\ \sf\longmapsto Efficiency=\dfrac{229.5}{3}[/tex]
[tex]\\ \sf\longmapsto Efficiency=76.5\%[/tex]
Carter is at the burger joint. To get there he traveled 5 blocks right and 10 blocks up. What coordinates did Carter start from?
Currently Carter is at 11 (Swimming pool)
Hope it helps you.. pls mark brainliest if it helps you
Drag each tile to the correct box.
Arrange in the correct order the actions and reactions that occur when the
Federal Reserve uses the required reserve ratio in its expansionary
monetary policy
Hiles
ince
Households and businesses
take out more loans,
GDP increases
The money supply increases.
Banks have more money
to lend
Federal reserve decreases the required reserve ratio.
Banks have more money to lend
Money supply increases
Interest rates fall
Households and business take out more loans
Purchases and investments increases.
There are two types of monetary policies, Expansionary and Contractionary.
The government decides the monetary policy based on the economy of a country. The government will have expansionary monetary policy when it requires more money in the economy. Interest rates are lowered and money supply is increased. This results increase in Gross Domestic products of the country and the economy strengthens.
Learn more at https://brainly.com/question/24325773
Answer:
Below is the answer
Explanation:
TUOI 7. A stone dropped from a window reaches the ground in 1.5 seconds. Calculate the height of the window above the ground
The height of the window above the ground is 11.025m
The first step is to write out the parameters given in the question
U(initial velocity)= 0
Time= 1.5 seconds
Acceleration due to gravity= 9.8
Therefore the height of the window can be calculated as follows
S= ut + 1/2gt²
= 0(1.5) + 1/2(9.8)(1.5²)
= 0 + 1/2(9.8)(2.25)
= 1/2(22.05)
= 0.5×22.05
= 11.025
Hence the height of the window above the ground is 11.025m
Click on the link below to learn more
https://brainly.com/question/11853995?referrer=searchResults
Suppose high tide is at midnight, the water level at midnight is 3 m, and the water level at low tide is 0.5 m. Assuming the next high tide will occur 12 hours later (at noon), find the time, to the nearest minute, when the water level is at 1.125 m for the second time after midnight.
We have that the time, to the nearest minute, when the water level is at 1.125 m for the second time after midnight is
[tex]t=10.0hours[/tex]
From the Question we are told that
Maximum height [tex]h_{max}=3m[/tex]
Minimum height [tex]H_{min}=0.5m[/tex]
Time for next high tide will occur[tex]T=12 hours =>720 min[/tex]
Generally Average Height
[tex]h_{avg}=\frac{3+0.5}{2}\\\\h_{avg}=1.75[/tex]
Therefore determine Amplitude to be
[tex]A=h_{max}=j_{avg}\\\\A=3-1.75\\\\A=1.25[/tex]
Generally, the equation for Time is mathematically given by
At t=0
[tex]h(x)=Acos(Bx)+h_{avg}[/tex]
Where
[tex]B=\frac{2\pi}{P}\\\\B=\frac{2\pi}{720}\\\\B=8.73*10^{-3}[/tex]
Therefore
[tex]h(t)=Acos8.73*10^{-3}(t)+h_{avg}[/tex]
Hence the Time at [tex]T=1.125[/tex] is
[tex]1.125(t)=1.25cos(8.73*10^{-3})(t)+1.75[/tex]
[tex]-0.1249t=1.75[/tex]
[tex]t=10.0hours[/tex]
For more information on this visit
https://brainly.com/question/22361343
for minimum deviation inside the prism the angle of emergence should be equal to
Answer:
Originally Answered: Why should angle of incidence be equal to angle of refraction for minimum deviation in a triangular glass prism? The angle of incidence is equal to angle of refraction only if the angle od deviation is 0.
Explanation:
not sure but
Don't Forget To Follow, Brainliest, And Give Me Heart :)
An athlete runs four laps of a 400 m track. What is the athlete's total displacement?
Answer:
○ 0 [tex]\checkmark[/tex]
Explanation:
Even if the athelete runs four laps of a 400 m track, its displacement will be 0 because the displacement is the shortest distance from its to final position. And, here the final and initial position is same since he comes to its initial position after covering certain distance. So, displacement is 0.
A force of 5N accelerates a mass by 2 m/s². What will be the acceleration if the force and mass were increased to twice their original value?
Answer:
4m/s4
Explanation:
Maya and Kenzie are discussing oil spills and how they impact the environment. How can humans help reduce the impact of oil spills?
Answer:
Using physical and chemical clean up methods to remove the oil
Explanation:
What is the dimensional formula of Modulus of Elasticity?
Lets find
[tex]\\ \sf\longmapsto Modulus\:of\:elasticity=\dfrac{Stress}{Strain}[/tex]
[tex]\\ \sf\longmapsto \dfrac{\left[ML^{-1}T^{-2}\right]}{\left[M^0L^0T^0\right]}[/tex]
[tex]\\ \sf\longmapsto \left[ML^{-1}T^{-2}\right][/tex]
D 2. Which of the following is an example of a specific goal?
O I want to lose weight.
I want to get stronger.
O I want to be able to walk one mile in 15 minutes.
I want to improve my speed.
I want to improve my speed
Answer:
D
Explanation:
can radiowaves penetrate clouds
What is principle of liver??
Answer:
lever: Principle of the Lever
lever: Principle of the LeverIt has been found by experiment that two equal forces acting in opposite directions, i.e., clockwise and counterclockwise, and applied to a uniform lever at equal distances from the fulcrum counteract each other and establish a state of equilibrium, or balance, in the lever.
How many degrees are there between the direction of motion and the force of
friction?
A. 270
B. 90
C. 180
D.0
Answer:
180°
Explanation:
Friction, if it exists, ALWAYS opposes motion or attempted motion.
I need help with this
Answer:
D, B, A, E, C
Explanation:
KE = m*g*h
PE = (1/2)m*v²
1. d
2. b
3. a
4. e
5. c
What is the dimension of Gravitation constant h?
[tex]\\ \sf\longmapsto Gravitational\:Constant(G)[/tex]
[tex]\\ \sf\longmapsto \dfrac{Force\times (distance)^2}{Mass\times Mass}[/tex]
[tex]\\ \sf\longmapsto \dfrac{\left[MLT^{-2}\right]\left[ML^1T\right]^2}{\left[M^1LT\right]\left[M^1LT\right]}[/tex]
[tex]\\ \sf\longmapsto \left[M^{-1}L^3T^{-2}\right][/tex]
Answer:
Or, G = [M1 L1 T-2] × [L]2 × [M]-2 = [M-1 L3 T-2]. Therefore, the gravitational constant is dimensionally represented as M-1 L3 T-2.
Explanation:
Hope it help you
Imagine that you are using a similar computer simulation to conduct an experiment on ph value of different liquid hand soap solutions and water. What is a potential source for error in such a computer model?
Please help!!
The computer model would rely on the labeled pH values of various hand soap brands however the labled pH value might not be entirely accurate, which could comprise the accuracy of the computer model.
Inaccuracies in the simulation's underlying chemistry model could be a potential source of mistake in an experiment involving the pH values of several liquid hand soap solutions and water.
The outcomes could differ from actual behavior if the model does not adequately represent the intricate chemical interactions that control pH fluctuations. Furthermore, because they might not exactly match the varied properties of real hand soap solutions, the simulation's assumptions and parameters could introduce bias. Disparities between simulation results and empirical findings may also result from inadequate consideration of temperature impacts and ambient factors. To reduce such possible mistakes, careful simulation validation against empirical data and chemistry model modification are required.
To know more about empirical data, here
brainly.com/question/32634558
#SPJ3
Two friends are carrying a 200-kg crate up a flight of stairs. The crate is 1.25 m long and 0.500 m high, and its center of gravity is at its center. The stairs make a 45.0° angle with respect to the floor. The crate also is carried at a 45.0° angle, so that its bottom side is parallel to the slope of the stairs (Fig. 2). If the force each person applies is vertical, what is the magnitude of each of these forces?
Let consider the whole system to be at equilibrium where the net force is zero. The forces [tex]F_A[/tex] and [tex]F_B[/tex] are acting in the upward direction while the weight (w) of the crate is acting in the downward direction.
The force at equilibrium in the y-direction is computed as:
[tex]\sum F_y = ma_y[/tex]
[tex]F_A +F_B= mg[/tex]
[tex]\mathbf{F_A = mg -F_B}[/tex] ---- (1)
Recall that the weight w = mg
where;
mass (m) = 200 g g(constant gravity) = 9.8 m/s²w = 200 × 9.8
w = 1960 N
The torque about the bottom end is also zero. i.e.
[tex]\sum \tau=0[/tex]
∴
[tex]F_B L_Z - wL_w = 0[/tex] --- (2)
[tex]F_B L_Z= wL_w[/tex]
[tex]F_B = \omega (\dfrac{L_w}{L_z})[/tex]
[tex]F_B =1960\times (\dfrac{0.375\times cos 45^0}{1.25\times cos 45^0})[/tex]
[tex]F_B =1960\times (0.3)[/tex]
[tex]\mathsf{F_B = 588 \ N}[/tex]
Replacing the value for the force of B into equation (1); we have:
[tex]F_A = mg - F_B[/tex]
[tex]F_A = 1960 - 588[/tex]
[tex]\mathsf{F_A = 1372 N}[/tex]
Thus, we can conclude that the magnitude of these forces i.e force B and force A are 588 N and 1372 N respectively.
Learn more about the equilibrium of forces here:
https://brainly.com/question/24018969?referrer=searchResults
A greater applied force is required to move an object with a greater mass than one with a smaller mass.
True
False
Answer:
True
Explanation:
The bigger an object is, the more force you must apply to move the object. Think about it like moving a mouse compared to moving an elephant. You can't move the elephant by yourself, because you don't have enough strength or force to move it. But, you can easily pick up a mouse, because it requires less force, or strength. Hope this helped :)
Answer:
I don't know
Explanation:
sorry but I will help u next time kk
A apartie undergoes two displacement.The one has amagnitude of 150cm and makes an angle of 120 degrees with that positive x-axis.The resultant of the two displacement is 140cm at 35 degrees to the positive x-axis .Find the magnitude and direction of second displacement
Answer:
A = 150 cm at 120 degc
Where A + B = C find B
B = C - A add -A to both sides
Ax = 150 cos 60 = -75
Ay = 150 sin 60 = 129.9
Likewise
Cx = 114.7
Cy = 80.3
Bx = Cx - Ax = 114.7 + 75 = 189.7
By = Cy - Ay = 80.3 -129.9 = -49.6
B = (189.7^2 + 49.6^2)^1/2 = 196.7 length of B vector
tan B = By / Bx = -49.6 / 189.7 B = -14.65 deg
Also
sin B = By / B = -49.6 / 196.1 = -14.65 deg
So B is 196.1 cm at -14.65 deg
why does a stone sink and a ship float
Answer:
A stone is more dense than water and the air in draft of the boat is less dense than water.
