Answer:
Energy
Explanation:
KBr: periodic table def
Answer: Is that a question?
Explanation:
Show the mathematical equation for
calculating the number of Neutrons an
atom has using its Atomic Number and
Atomic Mass
Answer:
ysyywhwywywyyeueueuwieheheuhrr9
a car travels 15 miles in 30 minutes . calculate the average speed
Answer:
15/30 = .5 miles/m
Explanation:
v = d/t
velocity = 15 / 30
What current is used to power the Untied States power grid? O alternating current O direct current
Answer:
Alternating
Explanation:
It is alternating because it is easy to distribute long distance.
Direct current is found in batteries and have large voltage drop over distance.
Answer:
alternating
Explanation:
it was right on my quiz
A girl and her bicycle have a total mads of 42 kg. At the top of the hill her speed is 4 m/s. The hill is 14.3m high and 112m long. If the force of friction as she rides down the hill is 20N, what us the speed at the bottom.
Answer:
13.78 m/s
Explanation:
Given that:
The mass of the girl & her bicycle = 42 kg
The speed at the top of the hilll= 4 m/s
The height of the hill = 14.3 m
The length of the hill (distance) = 112 m
The frictional force = 20 N
To find the speed at the bottom of the hill; we need to carry out the following processes.
The workdone by gravity = mass × acceleration due to gravity × Δh
= 42 × 9.8 × ( 14.3 - 0 )
= 5885.88 joules
The workdone by the friction = Force × distance = - 20 × 112 (since she is riding down the hill)
The workdone by the friction = -2240 Joules
The initial Kinetic friction = 1/2 mv²
= 1/2 × 42 × 4²
= 336 Joules
The final kinetic energy = Initial Kinetic energy + total work
The final kinetic energy = (336 + 5885.88 - 2240) Joules
The final kinetic energy = 3981.88 Joules
Using the final kinetic energy = 1/2 mv²
3981.88 = 1/2 × 42 × v²
3981.88 = 21 v²
v² = 3981.88/21
v² =189.61
v = [tex]\sqrt{189.61}[/tex]
v = 13.78 m/s
Therefore, the speed at the bottom = 13.78 m/s
What must happen to the electric current in power lines before it can safely enter your home?
It passes through a step-up transformer.
It passes through a turbine.
It passes through a generator.
It passes through a step-down transformer.
Answer: use the step down transformers to reduce these voltages in the power lines before they are supplied to the users.
Explanation:
Answer:
It passes through a step-down transformer.
Explanation:
Electric current in power lines must be stepped down before they enter our homes because they carry a very high voltage.
The voltage can destroy appliances that have very low voltage.
In this regard, a step down transformer is used to achieve this effect. The transformer brings the voltage to a level fit to consumers to use. When voltage is stepped down, appliances can work perfectly.what is the speed of a horse in meters per second that runs a distance of 1.2 miles in 2.4 minutes
(v) Which of the following is
responsible for wearing out of bicycle
tires?
(a) Muscular force
(b) Magnetic force
(c) Frictional force
(d) Electrostatic force
Why are Physical changes Not represented by Equations
Physical changes are not represented by equations because it does not involve rearrangement of atoms.
WHAT IS A PHYSICAL CHANGE:A physical change is a change that does not involve formation of new substances. Since no new substances are formed, this means that the atoms of the substance is not broken or rearranged. Unlike chemical changes, physical changes involves a change in state of matter.Therefore, physical changes are not represented by equations because it does not involve rearrangement of atoms.
Learn more about physical change at: https://brainly.com/question/864557
An Ewok accelerates (at a light jog) at 5 m/s/s with only 20 newtons of force. What is the mass of our furry friend?
Answer:
4 kgExplanation:
The mass of the object can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{20}{5} \\ [/tex]
We have the final answer as
4 kgHope this helps you
Answer:
XD
Explanation:
XD furry friend
Furry's muck eachother
Answer it and get 100 points.
Answer:
because metals a good conductor of electricity.
Explanation:
Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points. The free electrons in metals can move through the metal, allowing metals to conduct electricity.
Explanation:
Metals are good conductors of electricity and are ducitile i.e. can be drawn into thin wires hence they are used for making wires.
PLEASE HELP COME UP WITH 5 MULTIPLE CHOICE QUESTIONS FROM HEALTH RELATED FITNESS AND SKILL RELATED QUESTIONS
Answer:
1. What is not considered a cardiovascular workout?
A. Jogging
B. Sit ups
C. Jump Ropes
D. Burpees
Explanation:
I am sorry, I am in middle school and I only have one question.
A canoe accelerates 3 m/s/s when a force of 6 newtons is applied to it. What is the mass of the canoe and passengers?
The average force of a baseball is 18.9 N. Its mass is 0.145 kg.
Find the acceleration.
2.
a 130 m/s2
b
156 m/s2
С
75 m/s2
d
110 m/s2
Answer:
a
Explanation:
using f=ma
a=f/m
=18.9/0.145
=130.344
=130
Drawing a ray diagram for an object far from convex lens requires how many rays?
Question 12 options:
one
two
three
four
Answer
4
Explanation:
four rays can also explain the ray diagram if the object is at infinity
explain the difference between the three types of friction
Answer:
Static Friction
It is the friction that exists between a stationary object and the surface on which it's resting.
Sliding friction
It is the resistance created by two objects sliding against each other.
Rolling friction:-
It is the force resisting the motion when a body rolls on a surface.
help please....................
Answer:
a. arranging from least to higher pressure exerted by object B ,D A, C
b object B exert maximum pressure on surface because pressure is indirectly proportional to the surface area from the above figure we can easily conclude that object a have least surface area so, it exert more pressure on surface.
c.object C exert minimum pressure on surface because pressure is indirectly proportional to the surface area from the above figure we can easily conclude that object a have large surface area so, it exert less pressure on surface.
Explanation:
17. If a good is a luxury, what type of response will it cause?
a man of mass 50 kg climbs up stairs each of height 0.2 m in 20 seconds .calculate the power of the man
A car changes its velocity from 40.0 m/s to -5.0 m/s in 5.0 seconds what was the car average acceleration
Answ40x-50 =2334
Explanation:
idk
What would be the cause of bubbles appearing on the surface of a leaf? A.Photosynthesis is occurring and bubbles of oxygen gas are being absorbed into the plant leaf from the water. B.Photosynthesis is occurring and bubbles of oxygen gas are being released into the surrounding area.
If the focal length of a concave mirror is 18cm, find its radius of curvature.
Given :
The focal length of a concave mirror is 18 cm.
To Find :
The radius of curvature of the concave mirror.
Solution :
We know,
[tex]\text{Focal length}=\dfrac{\text{Radius of curvature}}{2}\\\\F=\dfrac{R}{2}\\\\R = 18\times 2\ cm\\\\R = 36 \ cm[/tex]
Therefore, the radius of curvature of concave mirror is 36 cm.
Hence, this is the required solution.
Atom A and Atom B have the same number of protons and neutrons, but they do not have the same number of electrons.
Which statement describes the atoms?
The atoms have the same chemical symbol.
The atoms have the same charge.
The atoms have different atomic numbers.
The atoms have different atomic masses.
Answer:
The answer is C- the atoms have different. A. Topic numbers
Explanation:
if they have the same neutrons and protons but not electrons the atomic numbers cant be the same if they dont have all 3 of the same numbers.
(on edge 2020-2021)
The atoms have different atomic numbers.
The atomic number of an atom is equal to the number of protons in its nucleus. Since Atom A and Atom B have the same number of protons and neutrons, they have the same atomic mass, which is the sum of protons and neutrons in the nucleus.
However, the number of electrons in an atom can vary. An atom is electrically neutral, which means it has the same number of protons and electrons. If Atom A and Atom B have different numbers of electrons, they will have different charges. One atom may have gained or lost electrons, making it either negatively charged (anion) or positively charged (cation), while the other remains neutral.
The chemical symbol of an element represents the identity of the element, and it is determined by the number of protons in the nucleus, which is the atomic number. Since the atoms have different atomic numbers, they will have different chemical symbols.
Therefore, the correct statement is that the atoms have different atomic numbers, as their atomic numbers determine their chemical identity.
To learn more about neutrons, here
https://brainly.com/question/31977312
#SPJ2
A fast car (Car A) and a slow car (Car B) both travel the same distance. Which car takes more time to do this? Explain.
Answer:
Input work is the work done on a machine as the input force acts through the input distance. This is in contrast to output work which is a force that is applied by the body or system to something else. Output work is the work done by a machine as the output force acts through the output distance.Jan 15, 2020 whhdbd dhd dvd s bs sbs shs shs sh s
Explanation:
avsvsyxsgzvs zvx shs dhx xbx dhd dvd dj
Planets A and B have the same size, mass, and direction of travel, but planet A is traveling through space at half the speed of planet B. Which statement correctly explains the weight you would experience on each planet? A. You would weigh less on planet B because it is traveling twice as fast as planet A. B. You would weigh the same on both planets because their masses and the distance to their centers of gravity are the same. O C. You would weigh more on planet B because it is traveling twice as fast as planet A. D. You would weigh the same on both planets because your mass would adjust depending on the planet's speed.
Answer:
B. You would weigh the same on both planets because their masses and the distance to their centers of gravity are the same.
Explanation:
Given that Planets A and B have the same size, mass.
Let the masses of the planets A and B are [tex]m_A[/tex] and [tex]m_B[/tex] respectively.
As masses are equal, so [tex]m_A=m_B\cdots(i)[/tex].
Similarly, let the radii of the planets A and B are [tex]r_A[/tex] and [tex]r_B[/tex] respectively.
As radii are equal, so [tex]r_A=r_B\cdots(ii)[/tex].
Let my mass is m.
As the weight of any object on the planet is equal to the gravitational force exerted by the planet on the object.
So, my weight on planet A, [tex]w_A= \frac {Gm_Am}{r_A^2}[/tex]
my weight of planet B, [tex]w_B=\frac {Gm_Bm}{r_B^2}[/tex]
By using equations (i) and (ii),
[tex]w_B=\frac {Gm_Am}{r_A^2}=w_A[/tex].
So, the weight on both planets is the same because their masses and the distance to their centers of gravity are the same.
Hence, option (B) is correct.
1.
How do you assess these words : "Terrorists ", "pretty"; "gay"? Are
your assessment based on unfo unded generalizations or facts?
Answer:
Terrorists:scary,ruthless,morbid. Pretty:beautiful,sweet. Gay:happy,sweet,nice
Explanation:
Reeee
PLEASE HELP ME
Which statement below accurately compares resistance and resistivity?
A. Resistance does not depend on size, shape, or amount of a material, while resistivity does.
B. Resistivity does not depend on size, shape, or amount of a material, while resistance does.
C. Resistance and resistivity both depend on size, shape, or amount of a material.
D. Resistance and resistivity are two words for the same physical property of a material and are measured in ohms.
Anna is sitting in a moving cart and throws a ball straight up. Theoretically, the ball should land in the cart, but it lands on the ground a little before the cart. What is the reason for the difference in the ranges of the ball and the cart?
Answer:
Reason for the difference in the ranges of the ball and the cart:
"the average speed of the cart is less than the instant speed of the cart at the time of throwing the ball".
Explanation:
Assuming that the air friction is negligible.
Given that the ball lands on the ground a little before the cart.
So, the range of the ball is more than the range of the cart in the same time interval.
Let the instant speed of the cart is v m/s at the time of throwing the ball in the vertically upward direction, so the speed of the ball in the horizontal direction = v m/s.
Let t be the total time of flight of the ball.
As the gravitational force is acting in the downward direction so it will not change the horizontal velocity of the ball.
So, the range covered by the ball [tex]= vt[/tex] m.
Let u be the average speed of the cart for the time t s (same as the time of flight of ball).
So, the distance by the cart [tex]= ut[/tex] m
As the range of the ball is more than the range of the cart in the same time interval, so
[tex]vt > ut \\\\\Rightarrow v>u.[/tex]
So, the reason for the difference in the ranges of the ball and the cart is "the average speed of the cart is less than the instant speed of the cart at the time of throwing the ball".
Explain how do global winds impact weather in an area?
Answer:
As the warmer air over the equator rises, colder air from the poles rushes toward the equator to take its place. Global winds push air masses around Earth and bring changes in the weather. In the United States, global winds called the prevailing westerlies push air masses from west to east.
Explanation:
Answer:
As the warmer air over the equator rises, colder air from the poles rushes toward the equator to take its place. ... Global winds push air masses around Earth and bring changes in the weather. In the United States, global winds called the prevailing westerlies push air masses from west to east.
Explanation:
Which refers to the rate of change in velocity?
speed
acceleration
direction
magnitude
Answer:
acceleration
Explanation:
it is the time rate change in velocity
Answer:
acceleration
Explanation:
