Answer:
The correct option is (C).
Explanation:
Electric current can be direct or alternating.
The direct current flows only in one direction. It is unidirectional.
The alternating current or an C current reverse its direction periodically.
So, the correct statement regarding the alternating current is (c) i.e. Electrons reverse direction periodically.
Scott is making a chart to show the difference between chemical reactions and nuclear reactions. Which part of his chart is incorrect? Chemical Reaction Nuclear Reaction Line 1 Happens in the nucleus of atoms Happens between atoms Line 2 Forms new compounds Forms new atoms and radioactive particles Line 3 Involves small amounts of energy Involves large amounts of energy
Answer:
The incorrect part of the chart is;
Line 1
Chemical [tex]{}[/tex] Reaction [tex]{}[/tex] Nuclear Reaction
Line 1 Happens in the nucleus of atoms [tex]{}[/tex] Happens between atoms
Explanation:
The given chart can be presented as follows;
Chemical Reaction [tex]{}[/tex] Nuclear Reaction
1. Happens in the nucleus of atoms [tex]{}[/tex] Happens Between atoms
2. Forms new compounds [tex]{}[/tex] Forms new atoms
3. Involves small amounts of energy [tex]{}[/tex] Involves large amounts of energy
From the above chart, line 1 is incorrect because a chemical reaction happens between the valence electrons of the reacting atoms while a nuclear reaction is the reaction that takes place between the nucleus of two or more atoms or the nucleus of an atom and a subatomic particle to produce one or more than new nuclide of a new atom with a change in the mass of the nucleus being represented by the large amount of energy in the reaction. Therefore, a nuclear reaction takes place in the nucleus of an atom, forms new atoms and involves large amounts of energy
The correct arrangement is presented as follows;
Chemical Reaction [tex]{}[/tex] Nuclear Reaction
1. Happens Between atoms [tex]{}[/tex] Happens in the nucleus of atoms
Part G Assume that friction causes the car to lose 37,800 joules of energy as it travels from the top of the first hill to the bottom.
What's the car's velocity at the bottom of the first hill? Use your answer from part C (416,500) and the formula v= to determine the answer.
(This formula is the kinetic energy formula, rearranged to find v.) 2KE
Answer:
29.9 m/s
Explanation:
answer on edumentum
Answer:
Because energy is conserved, the kinetic energy at the bottom of the first hill is the potential energy at the top of the hill, minus energy lost from friction:
KE = 416,500 J – 37,800 J = 378,700 J
To find the velocity of the car, plug the values for KE and m into the formula and solve:
The roller coaster car has a velocity of about 29.9 meters/second at the bottom of the first hill.
Explanation:
edmentum
13. How much work does a 35 N force do to lift a potted plant from the floor to a shelf 6 m high?
F = 35N
Id=6m
Wa
Answer:
W= 210 N
Explanation:
Just use work = Fparallel*d
W= 35*6
W= 210 N
4
12. The term, bullet, is often incorrectly applied to the:
a. primer, which includes primer powder, gunpowder, the bullet, and the
casing material that holds them all together.
b. cartridge, which includes primer powder, gunpowder, the bullet, and the
casing material that holds them all together.
c. anvil, which includes primer powder, gunpowder, the bullet, and the casing
material that holds them all together.
d. headstamp, which includes primer powder, gunpowder, the bullet, and the
casing material that holds them all together.
Answer:
B. Cartridge, which includes primer powder, gunpowder, the bullet, and the
casing material that holds them all together.
Explanation:
It is right trust me.
In an experiment, you test whether the number of times you rub a cloth against a balloon changes how long it will stick against the wall. You start by rubbing the balloon 10 times with the cloth and stick it to the wall. You repeat this three times and record your results in a table.
Observation
Number of Times Balloon is Rubbed by Cloth Trial #1 Trial #2 Trial #3
10 6 seconds 20 seconds 20 seconds
What statement best reflects why you should do repeated trials in an experiment? (2 points)
a
Rubbing the balloon against a cloth 10 times produces very different results each time it is repeated.
b
The first trial is right because it is done with new materials that give the best results.
c
The second and third trials were wrong because they were very different from the first trial.
d
You would make a wrong conclusion if it were based on the first trial in the experiment.
Fishing boats use sonar to locate schools of fish. What characteristic of sound is most important for this application of sonar?
Sound waves reflect off some surfaces
Sound waves diffract around corners
Sound waves interfere when they overlap
Sound waves spread out from a source
Answer:
A sonar device sends pulses of sound waves down through the water. When these pulses hit objects like fish, vegetation or the bottom, they are reflected back to the surface. The sonar device measures how long it takes for the sound wave to travel down, hit an object and then bounce back up.
draw the graph of the cooling curve of Naphtalene; hence discuss the cooling curve of Nephtalene
Answer:
soory but i cant under stand it proper can explain
A 110 kg fire-fighter descends down a pole. He experiences 530N of
friction.
d. Determine the fire-fighters weight
e. Draw an FBD
f. Determine the Fnet
What force can be seen when North Pole is brought near to South Pole
Answer:
Explanation:
The answer is magnetic force
Answer:
Magnetic forces which causes attraction between the two poles
Explain how tangential speed depends on distance.
What variables must be known to determine the observed frequency of a wave?
Answer:
The frequency, 'f', of a wave is given by the speed, 'v' of the wave and the wavelength, λ, of the wave
f = v/λ
The frequency, 'f', of a wave is also given by the inverse of the period, 'T', of the wave which is the time it takes the wave to complete an oscillation or a cycle
f 1/T
Therefore, the variables to be known to determine the frequency of a wave includes either, the velocity and the wavelength of the wave or the period of oscillation (the wave cycle) of the wave
Explanation:
state the Newton's law of cooling
Explanation:
Newton's law of cooling (or heating) states that the temperature of a body changes at a rate proportional to the difference in temperature between the body and its surroundings. It is a reasonably accurate approximation in some circumstances. dTdt=−k(T−T0), where k is a positive constant.
Answer:
Q=h.A.(T(t)-Tenu)
Explanation:
If a machine increases force it must apply the force over a long distance? True or false
Answer: The machine must apply the force over a shorter distance. That's because a machine doesn't change the amount of work and work equals force times distance. Therefore, if force increases, distance must decrease
FALSE
HOPE THIS HELPS
A construction worker drops a hammer from a 15 m high building. How fast is it going before it hits the ground?
Answer:
12.1 m/s
Explanation:
v^2-u^2=2as
v^2-0=g(15)
A 500N car is pulled up to 20m plank to a flat form 5m above the ground by an effort of 150N parallel to the plank. Calculate Velocity Ratio?
Answer:
4
Explanation:
Velocity ratio is the ratio of distance moved by effort to the ratio of distance moved by load
Velocity ratio = Distance moved by effort / Distance moved by load
Distance moved by effort = 20m
Distance moved by load = 5m
20m / 5m = 4
How can we create a new element by combining all the other elements
Answer:
In order to create a new element you have to change the number of protons in a nucleus.
What do you call the material or "stuff" that a wave travels through
A medium
B wave
C decibel
D doppler
a
plastic tube which has been rubbed with animal fur and gained 3.8x10 electrons.
The diagram below shows a 1.0 x 105newton truck at rest on a hill that makes an angle of 8.0° with the
horizontal. What is the component of the truck's weight parallel to the hill? (hint: the weight was already
calculated, also you can use the work area to help you solve this.]
Answer:
[tex]it \: is \: mg \sin(8.0 \degree) \\ = 1.0 \times 10 {}^{5} \times \sin(8.0 \degree) \\ = 9.9 \times 10 {}^{4} newtons[/tex]
The component of the truck's weight parallel to the hill is 13,917.31 N.
The given parameters:
Weight of the truck, W = 1.0 x 10⁵ NInclination of the hill, θ = 8⁰The component of the truck's weight parallel to the hill is calculated as follows;
[tex]W_x = mg \times sin(\theta)\\\\W_x = W \times sin(\theta)\\\\W_x = 1\times 10^5 \times sin(8)\\\\W_x = 13,917.31 \ N[/tex]
Thus, the component of the truck's weight parallel to the hill is 13,917.31 N.
Learn more about parallel forces here: https://brainly.com/question/9719731
Who wants to do my missing physics work
Answer:
WHAT IF I HATE PHYSICS ?explain newton's second law of motion
Answer: Newtons second law of motion: the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.
Explanation:
Hope this helps you! Have a good day!
Answer:
Newton's second law states that the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.
Example:Newton's Second Law of Motion says that acceleration (gaining speed) happens when a force acts on a mass (object). Riding your bicycle is a good example of this law of motion at work. Your bicycle is the mass. Your leg muscles pushing pushing on the pedals of your bicycle is the force.
Explanation:
~Hope this helps
A lens with f = 35.0 cm is held
42.0 cm from an object. Where
does the image form?
Answer: 210 cm
Explanation:
Look up Thin Lens Equations Calculator- it helps!
The entropy of the substance seems to decrease as this substance freezes. Why is this not contradicting the second law of thermodynamics?
Answer:
See Explanation
Explanation:
While it is true that a version of the second law of thermodynamics stated with respect to entropy states that the entropy of a system only increases or remains the same. It never decreases!
It then appears to be a contradiction when the freezing of ice leads to a more ordered structure and a seeming decrease in entropy of the ice as water changes from liquid to solid.
This law of thermodynamics is not violated here because the entropy of the universe increases (freezing is an exothermic process). This outweighs the decrease in entropy of the system hence the change in entropy is positive and the second law of thermodynamics is not violated.
Does the polarity of the rocks in the Aragorn Sea suggest that it is currently expanding? Explain. Thanks This is the last question
The answer is no. Hope this helps
what is reflection of light question mark write the laws of reflection of light
Answer:
Reflection of light means the bouncing back of light in another direction after hitting a smooth polished surface
laws of reflection1) Angie of incidence is equal to the angle of reflection
2) The nornal ray, reflected ray and the incident ray all lie in the same plane
Neutrons have a
charge______.
Answer here
Answer:
neutral
Explanation:
What happens to the magnetic force as an object gets further away from the magnetic field?
what is the best thermal insulator? aluminum copper steel or glass
Answer:
Copper is a better heat conductor than glass. In general, we think of metals as good conductors. In fact, metals vary widely in their conductivity but, overall, they are better conductors of heat than most liquids and gasses. Other solids also vary in their capability to conduct heat.
Explanation:
The best thermal insulator is glass. The correct option is D.
What is thermal insulator?The prevention of heat transfer between surfaces that are in thermal contact or within a radiative influence zone is known as thermal insulation.
In addition to using the right item forms and materials, specially engineered technologies or processes can also be used to provide thermal insulation.
The term "thermal insulation" refers to the various ways we try to prevent heat from transferring from one object to another.
These two items could be the inside and outside of exterior walls in residential structures or the hot and cold faces of processing equipment in industrial settings.
Glass has a very small amount of unpaired electrons that are not in use, making it a good electrical insulator. Extremely strong electron interactions hold the atoms of glass together.
Thus, the correct option is D.
For more details regarding thermal insulator, visit:
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What 2 materials are the planets in our solar system made of?
Please answer this quickly please please please please please please please
they are made up of rock and gas
Answer:
Hydrogen and Helium. 75% Hydrogen and 25% Helium.
Explanation:
Two point sources are simultaneously creating waves with a wavelength of 6 cm. Point X lies between the two sources. It is 9 cm from one source and 15 cm from the other. What wave heights do you expect at point X? A. The waves will never get very high or low. B. The waves may get very high, but will never get very low. C. The waves may get very low, but will never get very high. D. The waves will sometimes get very high and very low.
Answer:
OPTION D (The waves will sometimes get very high and very low) is the answer.
Explanation:
Wavelength = velocity ÷ frequency
As the frequency which measures the number of waves per unit of time is inversely proportional to the wavelength, point X which lies between two sources, and one source is shorter than another, the wave heights at point x will vary as the distances from point X vary too. This means that waves at point X depending on the wave type and source will get very high at times and very low.