Answer:
I am not sure about this question sry but u can try asking a tutor u don't need to use any points
Which are two pieces of evidence supporting the big bang theory?
A. black holes and pulsars
B. dark matter and dark energy
C. eclipsing binaries and quasars
D. cosmic background radiation and Hubble's law
Group of answer choices
Answer:
I think B but i'm not sure.
Explanation:
What happens to energy as frequency increases on the electromagnetic spectrum?
A dog pulls on a rope attached to a box and performs 250 J of work while dragging it across the floor a distance of 10 m. What amount of force is the dog pulling with?
Answer:
F = 25 N
Explanation:
The work done by any force is given as the product of the force and displacement produced by the application of that force. Therefore, the work done by the dog when it pulls the rope attached to the box can be given by the following formula:
[tex]W = Fd\\[/tex]
where,
W = Work done by the dog while pulling the rope = 250 J
F = Force of pull applied by the dog = ?
d = displacement of the box across the floor = 10 m
Therefore,
[tex]250\ J = F(10\ m)\\\\F = \frac{250\ J}{10\ m}[/tex]
F = 25 N
When the electric potential in a generator shifts positive, then negative and back positive, _____ is created.
Answer:
★ When the electric potential in a generator shifts positive, then negative and back positive, alternating current is created.
Explanation:
Hope you have a great day :)
Arrange the substances in the table from the MOST to the LEAST ordered particle arrangement es ) A) wood, water, neon gas B) wood, neon gas, water water, wood, neon gas D) water, neon gas, wood
Answer:
A) wood, water, neon gas
Explanation:
Matter, which constitutes every known substances is said to exists in three states namely: gaseous, solid and liquid. Each state of matter contain particles that make up their structure.
- Solids have well arranged particles that are tightly packed together to give it its solid shape. Example is wood
- Liquids have particles that are loosely packed together, hence, can still move about. Example is water
- Gases have particles that are not packed together, hence, their ability to roam freely. Example is neon gas
Based on this, the order of MOST to LEAST ordered particle arrangement is solid - liquid- gas i.e. wood - water - neon gas.
Which of the following statements are true about whether atoms tend to gain
or lose electrons?
A. Atoms with four valence electrons will always lose electrons.
B. Atoms with eight valence electrons easily lose electrons.
C. Atoms with five, six, or seven valence electrons will gain
electrons.
D. Atoms with one, two, or three valence electrons will lose
electrons.
Answer:
The true statements are;
C and D
Explanation:
The tendency of an atom to gain or lose electrons in a chemical reaction are given by its electronegativity and electropositivity respectively
Electronegativity is a measure of an atom's capacity to attract electrons from neighboring particles, with atoms that are more likely to gain an electron, being described as having a higher electronegativity
Electronegativity increases across the period with increasing number of valence electrons, therefore, elements with five, six, or seven electrons, which are located on the far right of the periodic table are said to have higher electronegativity and therefore more likely to gain electrons in a chemical reaction
Electropositivity is the quantification or measure of an element to donate or give electrons and become positively charged ions in a chemical reaction
The fewer the number of valence electrons an element has, the more likely the element will undergo a reaction by donating the valence electrons to a more electronegative atom and become positively charged
Electropositivity decreases across the period and therefore, elements with one, two, or three valence electrons which are located in groups I, II, and III, are more likely to lose electrons in a chemical reaction
Answer:
C+D
Explanation:
Which of the following can break solid rock
I would think the answer would be c
How could I track my running speed without a car or special equipment?
A Box has a weight of 54.43kg and the bottom of the box is 15 sq. Inch. How much pressure the box will exert on the floor?
Answer:8.00/in^2
Explanation:
Why are valence electrons so important?
A. They form no bonds with other atoms.
B. They are the electrons that interact with other atoms.
C. They are in the middle of the atom, shielding from the outside.
D. The number of valence electrons dictates what kind of element
the atom is.
Answer:
B. They are the electrons that interact with other atoms.
Explanation:
Valence electrons are the electrons in the outermost shell of an atom. These electrons are used by atoms to form bonds with other atoms during chemical bonding.
So, the basis by which atoms interacts with one another is through the valence electrons. Without the valence electrons, atomic combination to form compounds would not be possible. Valence electrons are the most loosely held electrons and they have the lowest ionization energy.no, this question isn't abt language arts, mathematics. Im asking u this
How are u doing? c:
Answer:
horrible, but how about you?
Explanation:
A 10 ohm a 15 ohm and a 20 ohm resistor are connected in series across a 9v supply what Current flows
Answer:
I = 0.2 A
Explanation:
The current flowing across each resistor in a series arrangement is the same throughout the circuit. So in order to calculate the current, we must first find the equivalent resistance of all three resistors. The equivalent resistance of the resistors connected in series is given as:
[tex]R = R_{1} + R_{2} + R_{3}\\R = 10\ ohm + 15\ ohm + 20\ ohm \\R = 45\ ohm[/tex]
Now we use Ohm's law for the current:
[tex]V = IR\\\\I = \frac{V}{R}\\\\I = \frac{9 volts}{45\ ohms}\\[/tex]
I = 0.2 A
When the biker is at the top of the ramp, he has a speed of 10 m/s at
the height of 25 m. The bike and person have a total mass of 100 kg.
He speeds into the spring at the end of the ramp, which slows him to
a stop. The total initial energy is
J.
Answer:
25000
Explanation:
100 x 25 x 10 = 25000
The total initial energy of the biker and the bike is 25000 J.
What is energy?Energy is the ability to do tasks. Joule is the SI unit for energy (J).
Potential energy, kinetic energy, thermal energy, chemical energy, electrical energy, and light energy are some of the several types.
Given parameters:
The bike and person have a total mass of 100 kg.
Speed of them = 10 m/s.
Height of them = 25 m.
Hence, initial kinetic energy = 1/2mv² = 1/2×100×10 joule = 500 joule.
initial potential energy = mgh = 100 ×9.8×25 joule = 24500 joule.
Hence, total initial energy = 24500 joule + 500 joule = 25000 joule.
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Gravity affects orbits in outer space.
True or False????
In an attempt to deliver a parcel on time,the dispatch rider had to ride 10 kilometers 15 degrees south east ,he then rode 11 kilometers 30 degrees north east and then takes a shortcut at 22 kilometers Find the rider's displacement
Answer:
D = 4.05 km
Explanation:
In this case, it's really neccesary to analyze the given data.
First, the rider goes 10 km SE 15°. Then 11 km 30° to the NE direction. Then, he dispatch the order, and then, takes a shorcut to get back at 22 km heading W (This is the missing data of your exercise).
According to all these data, we have the magnitude of the displacement in each part of the travel, but to know the displacement we need to know the x and y components of these magnitudes, so we can really know the total displacement of the rider.
Let's cut this by parts. Part A would be the 10 km SE, Part B 11 km 30° NE and finally Part C would be the remaining 22 km
Part A:
in this case, is heading south east, so it's going in the x-axis positive but y-axis negative so:
Dxa = 10 cos15° = 9.659 km
Dya = 10 sin15° = 2.588 km (But as we are heading south is negative) = -2.588 km
Part B:
Heading NE, it's positive in the x-axis and y-axis so:
Dxb = 11 cos30° = 9.526 km
Dyb = 11 sin30° = 5.5 km
Part C:
Finally in this part is heading west, which means is heading in the x-axis negative, and it does not have a y component so:
Dxc = Dc = -22 km
Now that we have the displacement for each part and it's components, let's calculate the displacement in X and Y:
Dx = 9.659 + 9.526 - 22 = -2.815 km
Dy = -2.588 + 5.5 = 2.912 km
To calculate the magnitude of the displacement:
D = √Dx² + Dy²
D = √(-2.815)² + (2.912)²
D = 4.05 kmHope this helps
A train left the station at 9:00am. The next stop was 629 km south. It
arrived at 2:00pm the same day. What was its speed?
Explanation:
We need to calculate the time it had travelled first:
9:00 to 12:00 = 3 hours.
12:00 to 2:00 = 2 hours
Total travel time = 5 hours.
The formula for speed is distance ÷ time (Hence, the unit for speed is m/s, kph, mph, etc.)
= 629km ÷ 5 hours
= 125.8 km/hour ~ 125.8kph
If a ball is dropped and takes 6.5 seconds to hit the ground below. How far did it fall? Remember in free fall g= -9.8 m/s/s. What is this question asking you to solve for? What variables are being used?
Answer:
See the answers below.
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]y=y_{o}+v_{o}*t+\frac{1}{2}*g*t^{2} \\[/tex]
where:
y - yo = Fall distance [m]
Vo = initial velocity = 0 (dropped)
t = time = 6.5 [s]
g = gravity acceleration = 9.8 [m/s²]
Now replacing:
[tex]y-y_{o}=0 +\frac{1}{2} *9.8*6.5^{2}\\y-y_{o}=207 [m][/tex]
The question is related to the distance between the points where the ball was dropped and the ground.
The variables used are gravitational acceleration, time, fall distance, initial velocity.
Which of the following situations will not generate stress?
a.
Driving in traffic
b.
Sleeping
c.
Opening a birthday present
d.
Watching a soap opera
Answer:
Sleeping
Explanation:
Driving in traffic is stressful because you may be late for wherever you are going,
Opening a birthday present is stressful because you don't know what is inside until you open it.
Watching a soap opera is stressful because you do not know what will happen next,
Sleeping is not stressful as long as you don't bring stressful topics to bed.
An individual drove 10 miles to his friends house. Then 15 miles to work.
Then 8 miles home. What was the distance traveled? *
0 miles
33 miles
25 miles
8 miles
Answer:
33 miles
Explanation:
10 + 15 + 8 = 33
Boyle law lab report
Answer:
what about it?
Explanation:
Answer:
its my lab report i did it in 5 minutes and it might be wrong sorry lol
Explanation:
heheheh stinky badussey
What is the density of an object with a mass of 12.0 g and a volume of 2.3 mL?
During 30.0 s, a train was moving with constant speed of 72 km/h. How far away it could relocate within this time?
Answer:
the distance is 0.6 km
Explanation:
The computation of the distance is shown below:
As we know that
Distance = Speed × time
where
Speed = 72 km/h
And, the time is 30 seconds
So, the distance is
= 72 × 30
= 0.6 km
Hence, the distance is 0.6 km
A figure skater on ice spins on one foot. She pulls in her arms and her rotational speed increases. Choose the best statement below.
1. Her angular speed increases because by pulling in her arms she creates a net torque in the direction of rotation.
2. Her angular speed increases because air friction is reduced as her arms come in.
3. Her angular speed increases because her angular momentum increases.
4. Her angular speed increases because her angular momentum is the same but her moment of inertia decreases.
5. Her angular speed increases due to a net torque exerted by her surroundings.
6. Her angular speed increases because her potential energy increases as her arms come in.
Answer:4
Explanation:
Trust me I'm a student
The rotational speed increases when the skater pulls her arms in because the moment of inertia decreases.
What is Angular momentum?It is the rotational momentum of the rotating object. It can be defined as the product of the moment of inertia and angular velocity.
[tex]L = I \omega[/tex]
Where,
[tex]L[/tex] - Angular momentum
[tex]I[/tex] - moment of inertia = [tex]mr^2[/tex]
[tex]\omega[/tex]- angular velocity
From the equation, the angular velocity of the body is inversely proportional to the moment of inertia.
When the skater pulls her arms in, the moment of inertia decrease due to a decrease in radius,
Therefore, the rotational speed increases when the skater pulls her arms in because the moment of inertia decreases.
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What is the acceleration of a sinking rock if it has a mass of 0.25 kg and has a net force of 0.44 N acting on it?
Answer: 1.76 m/s²
Explanation:
F = mass x acceleration
0.44 N = (0.25)(a)
0.44/0.25 = 1.76
a = 1.76
How many wavelengths are present in the sound wave shown?
1
2
3
4
Answer:
3
Explanation:
Just did it
Answer:
3
Explanation:
edge 2021
A student throws a 0.22 kg rock horizontally at 20.0 m/s from 10.0 m above the ground. Find the initial kinetic energy of the rock.
Answer:
44J
Explanation:
Given parameters:
Mass of rock = 0.22kg
Initial velocity = 20m/s
Distance moved = 10m
Unknown:
Initial kinetic energy of the rock = ?
Solution:
To solve this problem, we need to understand that kinetic energy is the energy due to the motion of a body.
It is mathematically expressed as;
Kinetic energy = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
Kinetic energy = [tex]\frac{1}{2}[/tex] x 0.22 x 20² = 44J
What is the equivalent resistance of the circuit?
60.0Ω
120.0V
20.0Ω
Ο Α. 20.0Ω
Ο Β. 80.0Ω
C. 40.0Ω
D. 200.0Ω
Answer: B) 80.0 ohms
Explanation:
You just add the resistance 60 plus 20 equals 80
Here, the two resistors are if connected in series, then the equivalent resistance of the circuit is the sum of the individual resistances that is 80 ohms Hence, option B is correct.
What is resistance ?Resistance is the hindrance to the current through a circuit. The resistance and current are in inverse proportionality. According to Ohm's law, the voltage across the circuit is the product of the resistance and current through the circuit.
In a parallel circuit, all components are connected in the parallel fashion and the current through each component is different. But in a series circuit, current through all the components is the same.
Equivalent resistance in a series circuit = R1 + R2 + R3 ...
For parallel circuit, 1/Req = 1/R1 + 1/R2 + ...
Here the two resistors are connected in series.
Hence, Req = 20 Ω + 60Ω = 180 Ω.
Therefore, the equivalent resistance of the circuit is 180 Ω.
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what is an example of non-renewable energy source?
Answer: coal
Explanation: Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs
four forces act at a point in the image above. calculate the resultant.
Answer:
50° and 60°
Explanation:
hope this help
I NEED HELP ASAP
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Describe how you would use vectors to represent an object moving at a constant velocity. Describe how you would use vectors to represent an accelerating object. (site 1)
Answer:
have a good day and just to let you know plz don´t copy and paste this put is into your words
Explanation:
Vector diagrams are diagrams that depict the direction and relative magnitude of a vector quantity by a vector arrow. Vector diagrams can be used to describe the velocity of a moving object during its motion. For example, a vector diagram could be used to represent the motion of a car moving down the road.In a vector diagram, the magnitude of a vector quantity is represented by the size of the vector arrow. If the size of the arrow in each consecutive frame of the vector diagram is the same, then the magnitude of that vector is constant. The diagrams below depict the velocity of a car during its motion. In the top diagram, the size of the velocity vector is constant, so the diagram is depicting a motion of constant velocity. In the bottom diagram, the size of the velocity vector is increasing, so the diagram is depicting a motion with increasing velocity
Vector diagrams can be used to represent any vector quantity. In future studies, vector diagrams will be used to represent a variety of physical quantities such as acceleration, force, and momentum. Be familiar with the concept of using a vector arrow to represent the direction and relative size of a quantity. It will become a very important representation of an object's motion as we proceed further in our studies of the physics of motion.
