Explanation:
Coefficient of kinetic friction is the resistive force that opposes the motion of a body as it moves and is in contact with another body.
It is found by dividing the frictional force by the normal force.
Friction is a force that opposes motion. Static friction is for bodies that are not in motion Kinetic friction is for moving bodies.why is area called scalar quantity
Answer:
Explanation:
Commonly area is a scalar quantity because there is no need of direction to define and also follow the algebrac summation. When we talk about vector there exist a frame of reference with a certain orogin
can you plz make me brainliast?
Answer:
I dont know what to answer so im just gonna say ok
Abby is 5 feet tall and casts a 4 foot long shadow of her older brother Ethan is standing next to her and casts a 4.6 shadow how much taller than Abby us Ethan
Answer:
0.6 ☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎
As you play baseball, you notice that your hand hurts less when you catch the ball by allowing your hand to move a bit. This happens by
Group of answer choices
Decreasing the momentum of the ball
Increasing the time of contact
Increasing the impulse
Increasing the force
Answer:
I believe the answer is D or B mostly D
Explanation:
HELPPPP LOOK AT THE SCREENSHOT TO ANSWER THE QUESTIONS
17. Which object or objects are traveling at a constant velocity?
1. A
2. B
3. C
4. D
5. E
18. Which object is accelerating?
1. A
2. B
3. C
4. D
19. Which object or objects are sitting still?
1. A
2. B
3. C
4. D
5. E
20. On average, which object is traveling at the fastest velocity?
1. A
2. B
3. C
4. D
5. E
Explanation:
17. B and D.
18. C.
19. A and E.
20. B
hope it helps. :)
a tow truck pulls a 2,000-kg car with a force of 4,000 N. what is the acceleration of the car?
A) 0.5 m/s2
B) 2 m/s2
C)200 m/s2
D)2,000 m/s2
Answer:
B
Explanation:
using f=ma
a=f/m
=4000/2000
=2 m/s2
Q1- Trick question a guy was floating in space, he had 30 seconds to get back to the international space station. Did he make it in time?
Answer:
yes____________??__________
help! 20 points
A scientist has two radioactive substances. One emits beta particles, and the other emits alpha particles. He thinks that since the alpha particles are larger, they are more dangerous to humans. Is he correct? Why or why not?
No, because beta particles move faster and can penetrate into the human body more easily.
No, because neither type of particle is dangerous to humans.
Yes, because alpha particles move more slowly, and therefore leave more lasting damage to humans.
Yes, because the larger particles carry more energy and can cause more damage to cells.
Answer:
No, because beta particles move faster and can penetrate into the human body more easily.
Explanation:
Some beta particles are capable of penetrating the skin and causing damage such as skin burns. However, as with alpha-emitters, beta-emitters are most hazardous when they are inhaled or swallowed.
Answer:
answer is A
Explanation:
if a tree falls in the woods and nobody is there to hear it, does it really make noise
Answer: Yes
Explanation: Because, Yes.
1. Draw the free body diagram for a parked car
2. Draw the free body diagram for a book being pushed across a smooth desk with no friction
3. Draw the free body diagram for a book being pushed across an old table top with a bumpy surface
Answer:
can't do it here
Explanation:
can't draw in here sorry dude
Katie kangaroo takes 0.25hours (15mins) to reach her friends house which is 7.5 miles away how fast was she hopping.
Answer:
30mph
Explanation:
7.5 miles / .25 hours = 30 mph
If a projectile is launched with no gravity acting on it which of the following is the trajectory?( pls hurry and do not comment if you don’t know )
Answer:
2nd one,
Its keep going, never return back
Answer:
The straight line.
Explanation:
I did this in an exam.
explain why competitive athletes do not smoke give as many reasons as you can
Answer:
Your muscles need oxygen to perform their function, and a reduction in the oxygen making its way to them means that muscles don't work as effectively. ... These negative effects are why most athletes don't smoke.
Explanation:
Which waves are used in medicine?
______
A. Gamma and Microwaves
B. X rays and Gamma
C. X rays and Infrared
D. Radio waves and UltraViolet
Answer:
C
Explanation:
Calculate the wave speed for a wave with a wavelength 2m and frequency of 0.3 Hertz?V
wavelength X frequency
Answer:
0.6m/s
Explanation:
Given parameters:
Wavelength = 2m
Frequency = 0.3hz
Unknown:
Speed of the wave = ?
Solution:
To find the speed of the wave, we must understand that this parameter depends on the frequency and wavelength of the wave.
So;
V = f∧
F is the frequency
∧ is the wavelength
Now, insert the parameters and solve;
V = 0.3 x 2 = 0.6m/s
Question 4 What is used to change the voltage in electrical lines? ( induction coils Generators Transformers magnets
Answer:
Transformers
Explanation:
Transformers are things that changer the amount of voltage in an electric line.
Colors are comprised of light rays of different what?
Answer:
Different wavelengths
Explanation:
A circuit consists of a wire, a lightbulb, a switch, and a battery. What would
happen if the switch were replaced with a section of wire?
O A. The voltage and resistance would both decrease.
OB. The voltage would decrease, and the resistance would increase.
O C. The voltage would increase, and the resistance would decrease.
O D. The voltage and resistance would be the same.
Answer: D
Explanation: I took the test on A P E X
D. The voltage and resistance would be the same.
How a light bulb in a circuit with a battery works?If the light bulbs are connected in parallel, the current flowing through the light bulbs combine to form the current flowing in the battery, while the voltage drop is 6.0 V across each bulb and they all glow.
In a series circuit, every device must function for the circuit to be complete.
Electricity needs a path to follow to get from one destination to another. And the journey is always the same:
Power – Electricity always starts from a source, like a battery or an outlet.
A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction.
This type of reaction involves the transfer of electrons from one material to another via an electric circuit.
In electronics, a circuit is a complete circular path that electricity flows through. A simple circuit consists of a current source, conductors and a load.
The term circuit can be used in a general sense to refer to any fixed path that electricity, data or a signal can travel through.
Therefore,
If the switch were replaced with a section of wire ,the voltage and resistance would be the same.
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During a basketball game, a player moves forward 6 meters, backwards 3 meters, and then forward 7 meters over the span of 12 seconds. What is the player's average velocity?
A. 0.83 m/s backward
B. 1.33 m/s backward
C. 0.83 m/s forward
D. 1.33 m/s forward
Answer:
0.83m/s forward
Explanation:
Velocity is the displacement divided by time.
Velocity = [tex]\frac{displacment}{time}[/tex]
Displacement is the distance moved in a specific direction;
→ 6meters forward
← 3meters backwards
→ 7 meters forward
Net displacement =7m + 3m = 10m forward
So;
Velocity = [tex]\frac{10}{12}[/tex] = 0.83m/s forward
The retina of the eye does all of the following except __________.
Answer:
C. rollback
Explanation:
The retina of the eye is located inside the eye making it impossible for the retina to roll back. Only the eye itself can rollback.
A student sits on the roof of their house which is 16 meters high. She can launch water balloons (horizontally) from a slingshot at 26 m/s. How far will each balloon travel (horizontally)?
A. 67.06 m
B. 17.06 m
C. 0.06 m
D. 47.06 m
Answer:
The horizontal distance traveled by the water balloons is 47.06 m.
D. 47.06 m
Explanation:
Given;
height of the house, h = 16 m
horizontal velocity of the water balloons, v = 26 m/s
The time taken for the water balloons to hit the ground is given by;
[tex]t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2*16}{9.8} }\\\\t = 1.81 \ s[/tex]
The horizontal distance traveled by the water balloons is given by;
x = vt
x = 26 x 1.81
x = 47.06 m
Therefore, the horizontal distance traveled by the water balloons is 47.06 m.
According to Ohm’s law, which combination of units is the same as the unit for voltage?
ohm ÷ ampere
ampere × ohm
ohm + ampere
ampere ÷ ohm
Answer:
B: ampere x ohm
Explanation:
Took the test
Answer:
option B
Explanation:
took the test hope this helps :)
Which best describes the materials that make up an electrical cord? a metallic conductor lacking free electrons surrounded by a rubber insulator with free electrons a metallic conductor with free electrons surrounded by a rubber insulator lacking free electrons a metallic insulator with free electrons surrounded by a rubber conductor lacking free electrons a metallic insulator lacking free electrons surrounded by a rubber conductor with free electrons Save and Exit der Vark this and return
Answer:
The behavior of an object that has been charged is dependent upon whether the object is made of a conductive or a nonconductive material. Conductors are materials that permit electrons to flow freely from particle to particle. An object made of a conducting material will permit charge to be transferred across the entire surface of the object. If charge is transferred to the object at a given location, that charge is quickly distributed across the entire surface of the object. The distribution of charge is the result of electron movement. Since conductors allow for electrons to be transported from particle to particle, a charged object will always distribute its charge until the overall repulsive forces between excess electrons is minimized. If a charged conductor is touched to another object, the conductor can even transfer its charge to that object. The transfer of charge between objects occurs more readily if the second object is made of a conducting material. Conductors allow for charge transfer through the free movement of electrons.
In contrast to conductors, insulators are materials that impede the free flow of electrons from atom to atom and molecule to molecule. If charge is transferred to an insulator at a given location, the excess charge will remain at the initial location of charging. The particles of the insulator do not permit the free flow of electrons; subsequently charge is seldom distributed evenly across the surface of an insulator.
While insulators are not useful for transferring charge, they do serve a critical role in electrostatic experiments and demonstrations. Conductive objects are often mounted upon insulating objects. This arrangement of a conductor on top of an insulator prevents charge from being transferred from the conductive object to its surroundings. This arrangement also allows for a student (or teacher) to manipulate a conducting object without touching it. The insulator serves as a handle for moving the conductor around on top of a lab table. If charging experiments are performed with aluminum pop cans, then the cans should be mounted on top of Styrofoam cups. The cups serve as insulators, preventing the pop cans from discharging their charge. The cups also serve as handles when it becomes necessary to move the cans around on the table.
Electrical conductors are made up of metals such as, copper, aluminum, etc. These metals are used to make wires. Most wires are made out of copper because it conducts electricity with high flexibility and very little resistance.
What is conductor ?
"A conductor, or electrical conductor, is a substance or material that allows electricity to flow through it. In a conductor, electrical charge carriers, usually electrons or ions, move easily from atom to atom when voltage is applied."
What is electricity ?
"Electricity is both a basic part of nature and one of the most widely used forms of energy. The electricity that we use is a secondary energy source because it is produced by converting primary sources of energy such as coal, natural gas, nuclear energy, solar energy, and wind energy, into electrical power."
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The direction of a moving object will not change if the net force acting on it is
Answer:
The direction of a moving object will not change if the net force acting on it is zero.
Explanation:
If there is a net force acting on a body, the body may accelerate, slow down, or change direction. In other words, an unbalanced net force may change the state of motion of a body.
The only way a moving object will not change its direction if the body is moving with a constant velocity, meaning all the forces acting on the body are in equilibrium (or balanced). In other words, the net force acting on it is zero, and the speed, as well as direction, would not change.
Therefore, we conclude that the direction of a moving object will not change if the net force acting on it is zero.
What is the magnitude (size) and direction of the cumulative force acting on the car shown in the picture above?
A.
2500 N up
B.
30 N to the right
C.
30 N to the left
D.
2500 N down
The vertical forces cancel, so only the horizontal forces are included in the net force. If the right is positive and the left is negative, then
50 N + (-20 N) = 30 N
so the net force is (B) 30 N to the right.
Answer:
(B) 30 N to the right.
Explanation:
When atoms of an element are excited, they emit specific wavelengths of light. How is this similar to a fingerprint when Fraunhofer lines are taken into account and useful for determining elements within a star?
Answer:
As you may know, each element has a "fixed" number of protons and electrons.
These electrons live in elliptical orbits around the nucleus, called valence levels or energy levels.
We know that as further away are the orbits from the nucleus, the more energy has the electrons in it. (And those energies are fixed)
Now, when an electron jumps from a level to another, there is also a jump in energy, and that jump depends only on the levels, then the jump in energy is fixed.
Particularly, when an electron jumps from a more energetic level to a less energetic one, that change in energy must be compensated in some way, and that way is by radiating a photon whose energy is exactly the same as the energy of the jump.
And the energy of a photon is related to the wavelength of the photon, then we can conclude that for a given element, the possible jumps of energy levels are known, meaning that the possible "jumps in energy" are known, which means that the wavelengths of the radiated photons also are known. Then by looking at the colors of the bands (whose depend on the wavelength of the radiated photons) we can know almost exactly what elements are radiating them.
yall think aliens real? for me no, because people been trying to search for them through telescopes and stuff for years. but still no sign of them, so they are not real, since there is no evidence, it leads us to the answer, no. we are alone in the universe. but that's only in my opinion...(I might be wrong.)
how about everyone else? how do yall feel about aliens, and us being alone?
Answer:
Personally I don't believe aliens exist maybe they do who knows but i don't think so.
Explanation:
A bus accelerates 25 m/s" and the bus has a mass of 150kg. What is the force on the bus?
Answer:
150 I would believe that it is the correct answer
Suppose a rollerblade racer finnished a 132 meter race in 18 seconds. What is the average speed of the rollerblade racer
Answer:
As = 7.33 [m/s]
Explanation:
To solve this problem we must use the definition of the average speed, which is equal to the relationship between the distance over time.
As = x/t
where:
As = average speed [m/s]
x = distance = 132 [m]
t = time = 18 [s]
As = 132/18
As = 7.33 [m/s]
why do some people suffer for nose bleed at higher altitudes?
Answer:because of small amount of oxygen
Explanation:
If you get higher by the atmosphere the air will start to decrease
