Faraday's law states that voltage cannot be increased by moving a magnet towards a coil.
a. true
b. false
The answer is false.
*Answer ASAP*
Describe how electromagnetic waves are formed and travel through space.
Electromagnetic waves are created by a charged particle that generates an electric field. The electric field creates a magnetic field. As the charged particle moves, the electric field and magnetic field keep changing, which causes the wave to move.
A hockey player has an acceleration of −3.1 m/s2. How long does it take him to come to a complete stop from a speed of 13 m/s?
If a certain mass of mercury has a volume of 0.002 m^3 at a temperature of 20°c, what will be the volume at 50°c
= 0.0020108 m³
Explanation;Using the concept on thermal expansion of matter, in this case thermal expansion of liquid mercury.V₁=0.002 m³, T₂ =20 °C
V₂= ? T₂ = 50° C
Thus, change in temperature will be; T₂ - T₁That is, 50°C - 20°C = 30 °C
The coefficient (γ) of volume expansion of Mercury at 20 °C is 0.00018 per centigrade.Therefore, the volume of mercury at 50° C will be given by;V₂ =V₁ [1 + γ(50-30)]
= 0.002 [1 + 0.00018(30)]
= 0.0020108 m³
Therefore; the volume of mercury at 50°C is 0.0020108 m³
The amount of a fossil fuel that can be extracted at a profit using current technology is called what?
four real-life examples of the results of scientific investigations
If the frequencies of two component waves are 24Hz and 20Hz, they should produce beats per second
Answer:
4 beats per second
Explanation:
When two waves of slightly different frequencies overlap, they produce an interference pattern called beat, which consists in a periodic oscillation whose frequency is called beat frequency.
The beat frequency is equal to the absolute value of the difference between the frequencies of the two original waves:
[tex]f_{beat}=|f_1 -f_2|[/tex]
In this problem, the frequencies of the two waves are:
[tex]f_1 = 24 Hz\\f_2 = 20 Hz[/tex]
So, the beat frequency is
[tex]f_{beat}=|20 Hz-24 Hz|=4 Hz[/tex]
which corresponds to 4 beats per second.
On which factor coefficient of cubical expansion depends?
Which of the following frictionless ramps (A, B, or C) will give the ball the greatest speed at the bottom of the ramp? Explain.
Answer:
The ball would have greatest speed at the bottom of ramp C
Explanation:
From the given ramps, C would generate the highest potential energy especially at the highest point that the ball starts to move down the ramp. Potential energy is the energy possessed by an object moving with a uniform velocit or at rest. Since potential energy increases with height, the potential energy gained by the ball on ramp C would cause an increase in its momentum as it glides down to the bottom of the ramp.
You replace a 200 W lamp with a more efficient 55 W LED lamp. If you leave your lights on 24 hours a day, how much energy are you saving each day by replacing this bulb?
A.21,225,000 J
B.17,280,000 J
C.4,752,000 J
D.12,528,000 J
The amount of energy will be 12,528,000 J.
What is energy?Energy represents the ability to do tasks. This could exist in several forms, including potential, kinetic, thermal, electrical, chemical, radioactive, and others.
Given data:
[tex]P_{1} = 200 W\\P_{2} = 55W[/tex]
Calculation of energy
The energy can be calculated by using the formula:
ΔW = [tex]W_{1} - W_{2}[/tex]
It is known that, w = pt
where, w is energy and p is power.
ΔW =
[tex]= P_{1}t - P_{2}t = t(P_{1}- P_{2}) \\= 86400 (200 - 55) \\= 12528000 J[/tex]
Therefore, the amount of energy will be 12,528,000 J.
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Which of the following is a change of state of a substance? A. Water placed in the freezer forms ice cubes. B. A piece of metal becomes warm in sunlight. C. A large piece of paper is cut into eight strips. D. Rain falls on dry ground and is quickly absorbed.
The temperature of an object is raised by 90oC . This is equivalent to what increase in its absolute temperature?
What two simple machines make up an axe?
A) a wedge and a lever
B) a wedge and a screw
C) a screw and a lever
D) a pulley and a lever
A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.00 s?
The ball's velocity after 3.00 seconds is -9.8 m/s. The negative sign indicates that the ball's velocity is directed downward after 3.00 seconds.
Given:
u = 19.6 m/s (upward)
t = 3.00 s
The equation for the vertical motion of an object under constant acceleration:
v = u + gt
Where:
v = final velocity
u = initial velocity
g = acceleration due to gravity
t = time
v = u + gt
v = 19.6 + (-9.8) × 3.00
v = -9.8 m/s
The negative sign indicates that the ball's velocity is directed downward after 3.00 seconds. Therefore, the ball's velocity after 3.00 seconds is -9.8 m/s.
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To find the ball's velocity after being thrown upward at a velocity of 19.6 m/s after 3.00 seconds, apply the kinematic equation, v = u + at. Using gravity's acceleration of -9.8 m/s², the final velocity is calculated to be -9.8 m/s, indicating downward movement.
The question involves calculating the velocity of a ball after 3.00 seconds when it is thrown upward with an initial velocity of 19.6 m/s. To solve this, we can use the formula v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration (which, in the case of free fall, is the acceleration due to gravity and is approximately -9.8 m/s²), and t is the time in seconds. The negative sign represents that gravity is acting in the opposite direction of the throw.
Using this formula:
u = 19.6 m/sa = -9.8 m/s²t = 3.00 sWe find the final velocity:
v = 19.6 m/s + (-9.8 m/s²) * 3.00 s = 19.6 m/s - 29.4 m/s = -9.8 m/s
This means that after 3.00 seconds, the ball's velocity would be -9.8 m/s, where the negative sign indicates that at this point, the ball is moving downwards.
what are the first 36 elememts in the periodic table
The first 36 elements in the periodic table are: H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Kr.
The first 36 elements in the periodic table are as follows:
1. Hydrogen (H)
2. Helium (He)
3. Lithium (Li)
4. Beryllium (Be)
5. Boron (B)
6. Carbon (C)
7. Nitrogen (N)
8. Oxygen (O)
9. Fluorine (F)
10. Neon (Ne)
11. Sodium (Na)
12. Magnesium (Mg)
13. Aluminum (Al)
14. Silicon (Si)
15. Phosphorus (P)
16. Sulfur (S)
17. Chlorine (Cl)
18. Argon (Ar)
19. Potassium (K)
20. Calcium (Ca)
21. Scandium (Sc)
22. Titanium (Ti)
23. Vanadium (V)
24. Chromium (Cr)
25. Manganese (Mn)
26. Iron (Fe)
27. Cobalt (Co)
28. Nickel (Ni)
29. Copper (Cu)
30. Zinc (Zn)
31. Gallium (Ga)
32. Germanium (Ge)
33. Arsenic (As)
34. Selenium (Se)
35. Bromine (Br)
36. Krypton (Kr)
These elements are arranged in order of increasing atomic number, which is the number of protons in the nucleus of an atom. The periodic table is a fundamental tool in chemistry that organizes all known elements according to their chemical and physical properties. The elements are grouped into periods (rows) and groups (columns), with elements in the same group sharing similar chemical properties. The first 36 elements include metals, nonmetals, and metalloids, and they form the basis of a wide range of chemical compounds and materials essential to life and technology.
Which formula can be used to find velocity if kinetic energy and mass are known?
V = √(2K.E/m) where v is the velocity, K.E is the kinetic energy and m is the mass.
Explanation;Kinetic energy is the energy possessed by a body when in motion. It is calculated by the formula, K.E = 1/2 MV² , where m is the mass of the body, and v is the velocity of the body.
To get Velocity from the formula, we make V the subject of the formula, such that;
K.E = 1/2mv², multiplying both side by 2;
2 k.e = mv²; then we divide both side by m.
v² = 2k.e/m; then we get the square root on both side;
v = √(2k.e/m)
There is a species of starfish called the crown of thorns. This species is responsible for killing coral reefs around the world. If you want to find out how these species have become so abundant around the world, who would you call? an astronomer a geologist a meteorologist an oceanographer Next Question Ask for help Turn it in
Answer: oceanographer
An oceanographer is a special kind of scientist who studies various aspects of ocean such as marine ecology, chemistry of oceanic water, geology linked with ocean such as plate tectonics, earthquakes and volcanic eruptions, ocean water circulation and climatic influence of ocean on landmass. An oceanographer specialized in marine biology and ecology will study the interaction of marine animals and plants with each other and with the oceanic water.
Therefore, oceanographer is a scientist which can be called upon to study the interaction of species of starfish called as the crown of thorns with the coral reefs all around the world. The oceanographer can also find out the abundance of starfish species around the world.
What is a substance?
A model rocket with a mass of 0.181 kg is launched into the air with an initial speed of 92 m/s. How much kinetic energy will the rocket have at a height of 164 m? Assume there is no wind resistance.
303 J - 747 J - 634 J - 444 J
I have tried taking the initial KE with 1/2*.181*92^2 and subtracted the final potential energy .181*9.8*164. This gets me 475, which isn't any of the choices. I picked 444 J since it was the closest, but it was wrong.
Intuition might tell us that rough surfaces on clothing would inhibit the speed of an Olympic athlete. Why is this line of thinking not true in some cases? How can controlled roughness actually promote speed?
Answer:
We associate roughness with a greater coefficient of friction, then we think that rough surfaces on clothing would inhibit the speed of an Olympic athlete. This is not always true because the amount of roughness might improve the way air pass through the fabric.
One example of controlled roughness that actually promote speed are the dimples on golf balls. Dimples create turbulence around the ball, which sucks air to the ball, making its displacement easier and promoting its speed.
An object is thrown with an initial velocity v0 forming an angle θ with an inclined plane, which a In turn it forms an α-angle α with a horizontal plane.
A) Find the distance X from the launch point to the point where the object falls. X = F (v0, θ, α, g)
B) Find the distance for v0 = 20m / s, θ = 53o , α= 36 ° , g = 9.8m / s2
a body is placed on a rough inclined plane. Why does the frictional force decrease with the increase of angle of inclination?
Electromagnetic force is present when electromagnetic fields
Answer: Interact With Charged Particles
Explanation:
Maurice pulls on the end of a spring scale. He lets go of the end and observes the spring snap back into place. What force restores the spring to its original shape?
a. tension
b. elastic
c. drag
d. applied
Answer:
Elastic Force
Explanation:
As we pull the spring from one of its end by some distance such that its length is stretched by some amount "x"
So here the restoring force on the spring is given as
[tex]F = kx[/tex]
so here we know
k = coefficient of elasticity
x = change in the length of spring
So here the restoring force on the spring will be Elastic force which always act opposite to the direction of displacement of the spring
Bill does 1500 j of work on a leaver, which is a simple machine. The lever does 1350 j of work on a stone. What is the efficiency of the leaver?
c) 90% is the efficiency of the leaver.
Efficiency is the energy output, divided by the energy input, and expressed as a percentage.
Efficiency = (1350/1500)×100
= 90%
What is the formula for efficiency?
Efficiency may be expressed as a ratio by using the following components: Output ÷ input. Output, or painting output, is the overall amount of useful work finished without accounting for any waste and spoilage. You can also express performance as a percentage by using multiplying the ratio by using one hundred.
A second class lever is the handiest lever which can promise that the attempt arm will usually be more extra than the load arm. This arrangement results in a larger attempt arm-to-load arm ratio, making the second magnificence lever the maximum robotically high-quality.
The question is incomplete. Please read below to find the missing content.
Bill does 1500 J of work on a lever, which is a simple machine. The lever does 1350 J of work on a stone.
What is the efficiency of the lever?
a)0.9%
b)1.1%
c)90%
d)111%
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Which of the following is the reason a lever is used in a shovel?
A. a lever is used to decrease effort force
B. a lever is used to decrease resistance force
C. a lever is used to increase resistance force
D. a lever is used to increase the effort force
Read “Solar Basics” on the Energy Kids website. Specifically, read text under “Two limitations of solar energy”. Use the information to answer the question. What factors affect the amount of solar energy that reaches the Earth’s surface?
Sample Response: The amount of solar energy that reaches the Earth’s surface depends on the weather, location, and time of year.
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What is a Substance?
A) a uniform mixture that can’t be separated
B) a mixture that can be separated
C) a single component that can’t be separated
D) a single component that can be separated
A substance is a single component that cannot be separated into other substances. Homogeneous mixtures exemplify this concept.
Substance refers to a single component that can't be separated into other substances through chemical means. A homogeneous mixture is a type of substance that is uniform throughout, like salt dissolved in water.
Which object has elastic potential energy? a piece of bread a ball at rest a stretched rubber band a falling leaf
A stretched rubber band has elastic potential energy.
the number of single covalent bonds that most non metallics can form