why are north and south poles important to magnets
Answers
Answer:
All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field.
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Related Questions
1. A baseball that has been thrown is travelling at 40m/s. If
the ball has a mass of 0.142kg, how much kinetic energy
does it have?
2. If a similar baseball was hit and travelled at 52m/s and
had 196J of kinetic energy, what is the mass of that
baseball?
3. A 4kg shot put is thrown and it has 288J of kinetic energy.
What is the mass of the shot put?
Answers
Answer:
See explanations below
Explanation:
1) KE = 1/2mv²
mass m = 0.142kg
v = 40m/s
KE = 1/2 * 0.142 * 40^2
KE = 1/2 * 0.142 * 1600
KE = 800*0.142
KE = 113.6Joules
2) KE = 1/mv^2
KE = 196
mass m = ?
velocity v = 52m/s
Substitute
196 = 1/2*m*52²
196 = 1352m
m = 196/1352
m = 0.145kg
Hence the mass of the baseball is 0.145kg
3) KE = 1/2mV^2
288 = 1/2 * 4v²
288 = 2v²\
v² = 288/2
v² = 144
v = 12m/s
The velocity of the shotput is 12m/s
What is the mass of an object that requires a force of 4,900 Newton's to accelerate 7 m/s/s
Answers
Answer:
Explanation:
Formula
F = m * a
Givens
F = 4900
a = 7 m/s^2
Solution
4900 = m * 7 Divide by 7
4900/7 = m
700 kg = m
The moon is lit by light bouncing off of it. That light reaches Earth as ____. The different shapes that the moon appears to have are called ____. The moon goes through ____ phases as it revolves around the ____ every ____ days. The phase that we see depends on how much of the ____ part of the moon we can see. This depends on the positions of the ____, ____, and ____.
Answers
Answer:
Moonlight; phases; eight; 29 days; sunlit; earth; sun; moon.
Explanation:
A moon generally do not have or possess light but rather it reflects the light from the sun.
The moon is lit by light bouncing off of it. That light reaches Earth as moonlight. The different shapes that the moon appears to have are called phases. The moon goes through eight (8) phases as it revolves around the earth every 29 days. The phase that we see depends on how much of the sunlit part of the moon we can see. This depends on the positions of the earth, sun, and moon.
The eight (8) phases of the moon include the following;
1. Last quarter half moon.
2. Waning crescent moon.
3. New moon.
4. Waxing crescent moon.
5. First quarter half moon.
6. Waxing Gibbous moon.
7. Full moon.
8. Waning Gibbous moon.
what is the the relationship between velocity and gravity?
Answers
Answer: When objects fall to the ground, gravity causes them to accelerate.
Explanation: Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls.
3. What is the difference between Synthetic Oil, Semi-Syntheic oil (Blend), High milage motor oil, and conventional motor oil?
Answers
Answer:
When evaluating synthetic blends, it's helpful to define the terms “synthetic blend” and “semi-synthetic”. Generally speaking, synthetic blends and semi-synthetic refer to the same thing: an oil that uses a combination of conventional and synthetic base oils in its formulation.
Explanation:
John attached a ball to a spring
Answers
Answer:
C down
Explanation:
The ball is pulling the spring down so this must be the direction of the force
What season would it be for someone living near locaton 3 on the Earth?
Fall
Winter
Summer
Spring
Answers
Answer:
It would be summer for someone living near location 3 on the Earth.
Explanation:
can someone helppppppppp meeeeeeeeeee plzzzzzz ill give brainliest
Answers
A 10 kg cart is attached to a rope that forces the cart to travel along a circular path. The rope has a length of 2.7 meters and has a rotational speed of 2.0 rotations per second.
Answers
Answer:
F = 4361.7 N
Explanation:
In this exercise the force of the string is asked, to solve it we use Newton's second law
F - W = m a
force is the tension of the rope
the centripetal acceleration is
a = v² / r
the angular and linear speed are related
v = w r
let's substitute
F - mg = m w² r
F = m (g + w² r)
let's reduce the magnitudes to the SI system
w = 2.0 rot / s (2π rad / 1 rev) = 4π rad / s
let's calculate
F = 10 (9.8 + (4π)² 2.7)
F = 4361.7 N
1)the car's engine power is 44000W. Explain this number in a physical sense
...
2)400g masses in April, rising steadily over 20s reaches 100m high. What power is developing in April
...
3)the bullet is fired vertically upwards at a speed of 600 / m / s. to what maximum height it would rise if there were no air resistance
...
Answers
Answer:
1) It expresses the rate (top speed) at which it can move with time.
2) P = 20 W
3) h = 18 km
Explanation:
1) Power is the rate of transfer of energy.
⇒ Power = [tex]\frac{Energy(or workdone)}{Time}[/tex]
i.e P = [tex]\frac{E}{t}[/tex]
Thus a car's engine power is 44000W implies that the engine of the car can propel the car at this rate. This expresses the rate (top speed) at which it can move with time.
2) m = 400g = 0.4 kg
t = 20 s
h = 100m
g = 10 m/[tex]s^{2}[/tex]
P = [tex]\frac{mgh}{t}[/tex]
= [tex]\frac{0.4*10*100}{20}[/tex]
= [tex]\frac{400}{20}[/tex]
P = 20 W
3) u = 600 m/s
g = 10 m/[tex]s^{2}[/tex]
From the third equation of free fall,
[tex]V^{2}[/tex] = [tex]U^{2}[/tex] - 2gh
V is the final velocity, U is the initial velocity, h is the height.
0 = [tex](600)^{2}[/tex] - 2 x 10 x h
0 = 360000 - 20h
20h = 360000
h = [tex]\frac{360000}{20}[/tex]
= 18000
h = 18 km
The maximum height of the bullet would be 18 km.
how will you include physical fitness in your life?
Answers
Answer:
I get up at 5 in the morning exercise then take a shower then go back to sleep till it's time to eat breakfast and go to school. Then at 7 or 8 o clock pm after i eat dinner at 5 i exercise at 7 then take a shower and then go to bed i do this everyday.
Explanation:
Getting off the couch or out of your seat to start walking, running, bicycling, swimming or other activity may help you lead a healthier and happier life. ... Those activities can include walking briskly, gardening, bicycling slowly or even ballroom dancing.
Does an explicit formula for a sequence make sense assuming n = 2.5? Explain
Choose the correct answer below
O A. It makes sense, but only if the term for n = 2.5 is an integer
OB. It does not make sense since n is the term number. It is not possible to have a term between the second and third terms.
OC. It makes sense since n is a variable, and variables can be any real number
OD. It does not make sense since n can be negative or positive but must be an integer.
Answers
Answer:
c
Explanation:
tbh I think it is c because of what the explanation says so
Answer:
D
Explanation:
because i got it right when guessing its d
what's electron affinity? and what is the formula of electric current?
Answers
Answer:
Electron affinity is the energy change that results from adding an electron to a gaseous atom. For example, when a fluorine atom in the gaseous state gains an electron to form F⁻(g), the associated energy change is -328 kJ/mol.
Give brainliest please.
Answer:
Electron affinity is the energy change that results from adding an electron to a gaseous atom.
Sorry I don't know about the second one.
What is the average velocity of Runner C for the first 15 seconds? Question 5 options: 1.3 m/s -2.7 m/s -1.3 m/s 2.7 m/s
Answers
Answer:
2.7 m/s
Explanation:
Took the test and got 100%
what is the economic system in the united states?
A. Capitalist economy
B. Stock Market economy
C. Global economy
D. Communist economy
Answers
Answer:
A. Capitalist economy
Explanation:
The United States is a capitalist economy. Hope this helps, thank you !!
If the Sun were the size of a small exercise ball (about 0.5 meters (m) in
diameter) and if Jupiter were the size of a golf ball, how big would Earth be
on this scale?
Answers
Answer:
the size of a pea
Explanation:
when a electric current is passed through an insulated wire that is coiled around an iron core like a nail what is created?
Answers
electromagnet
When a electric current is passed through an insulated wire that is coiled around an iron core, like a nail, an electromagnet is created.
Which mass extinction occurs the slowest?
A. Asteroids
B. Climate Change
C. Volcanic Eruption
Answers
Answer:
B. climate change
Explanation:
asteroids are too big and volaconos are probably gonna create a lot of smoke that can kill ya in seconds so I guess climate change
From the simulation and the readings that you may have recorded, what do you observe about the relation between period and frequency?
Answers
Answer: The speed of the wave appears to be constant. This is because the speed of sound depends only on the properties of the medium, and the medium is the same.
Explanation: The answer is from edmentum. Just letting you know on what not to copy and paste. Change it up.
If the horse lifts a 50 kilogram mass a vertical distance of 3 meters in 2 seconds, what is the horse’s minimum power output?
T= 2s
d= 3s
m= 50kg
Answers
Answer:
735watts
Explanation:
Power = Force*distance/time
Given
Force = mg = 50 * 9.8'
Force = 490N
distance = 3m
time = 2s
Substitute
Power = 490*3/2
Power = 1470/2
Power = 735Watts
Hence the minimum power output is 735watts
Calculate the kinetic energy of a 2kg ball moving at 5m/s
Answers
Answer:
25
Explanation:
The kinetic energy is 25
A 8.0 kg bowling ball moves at 3.0 m/s. Calculate the kinetic energy of the ball?
Answers
Answer:
Explanation:
KE = 1/2mv^2
=1/2(8)(3^2)
=4*9
=36 Joules
All changes
5. What is the major difference between the Bohr model and the currently accepted atomic
model?
O Bohr assumed that electrons could be found within an electron cloud.
O Bohr assumed that electrons move in fixed orbits.
Bohr assumed that the nucleus was positive.
Bohr assumed that electrons have very little mass.
Answers
Of the following reactions, which is a fusion reaction?
a.
uranium-235 absorbing a neutron and splitting into xenon-140, strontium-94, and two neutrons
b.
hydrochloric acid combining with sodium hydroxide to form a salt and water
c.
carbon-14 decaying into nitrogen-14 and a beta particle
d.
curium-246 combining with carbon-12 to form nobelium-254 and four neutrons
Answers
Answer:
Option D is correct.
Explanation:
It is fusion reaction.because curium combines with carbon to form a big nuclei of nobelium.[tex]Cm_{246} +C_{12}[/tex] → [tex]No_{254}[/tex]
Hence, it is the fusion reaction.
What is fusion?When two or more nuclei fuse together to form a heavy nucleus with the energy released, is called fusion.
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After running for a while, the fan becomes hot to the touch, and ever so often releases ___________________ energy into the air.
*Note* Another form of energy is released from the kettle. What is it? ______________
Answers
Answer:
thermal
Explanation:
A longitudinal wave is transporting energy from south to north. the particles in the medium will move...
east only
north and south only
north only
east and west only
30 POINTS PLEASE HELP
Answers
Answer:
north only
Explanation:
2. A 7.0 kg box, which is initially at rest at the bottom of a frictionless ramp, is pulled up the ramp by a string
When it reaches a height of 2.0 m, the box is moving at 6.0 m/s. It takes 2.0 seconds for the box to reach this height.
a) Calculate the work done by the string in pulling the box
up
the
ramp.
b) Calculate the power exerted by the string in pulling the box up the ramp.
Answers
Answer:
a) The work done in raising the block up to 2.0 m is 137.2 joules
b) The power exerted by the string in pulling the box up the ramp is 68.6 watts
Explanation:
The question examines the relationship between work energy and power
The parameters of the pulled box are;
The mass of the box, m = 7.0 kg
The height to which the box is pulled, h = 2.0 m
The velocity at which the box is moving at the 2.0 m height = 6.0 m/s
The time if takes the box to reach the height of 2.0 m = 2.0 seconds
The acceleration due to gravity, 'g' is taken as approximately 9.8 m/s²
a) The work done in raising the block up to 2.0 m = The potential energy gained by the block
The potential energy gained by the block, P.E. = m·g·h
Therefore, we have;
The work done in raising the block up to 2.0 m = P.E. = m·g·h
By substituting the given values, we get;
The work done in raising the block up to 2.0 m = 7.0 kg × 9.8 m/s² × 2.0 m = 137.2 joules
b) Power = The rate of doing work
∴ Power, P = Work done/(Time takes for the work)
The work done in raising the block up to 2.0 m = 137.2 joules
The time if takes the box to reach the height of 2.0 m = 2.0 seconds
∴ The power exerted by the string in pulling the box up the ramp, 'P' is given as follows;
P = 137.2 joules/(2.0 seconds) = 68.6 watts
The power exerted by the string in pulling the box up the ramp, P = 68.6 watts.
What are the determinants for potential energy?
Answers
A 5kg box rests on a table. a 3 kg box rests on top of the 5 kg box. what is the normal force from the table?
a. 19.6 n
b. 29.4 n
c. 49 n
d. 78.4 n
Answers
==> The total mass resting on the table is (5 kg + 3 kg) = 8 kg.
==> The total weight of that mass is (8 kg) x (9.8 m/s) = 78.4 newtons
==> The boxes are stacked. So the table doesn't know if the weight on it is coming from one box, 2 boxes, 3 boxes, or 100 boxes in a stack. The table only knows that there is a downward force of 78.4 newtons on it.
==> The table stands in a Physics classroom, and it soaks up everything it hears there. It knows that every action produces an equal and opposite reaction, and that forces always occur in pairs.
Ever since the day it was only a pile of lumber out behind the hardware store in the rain, the table has known that in order to maintain the good reputation of tables all over the world, it must resist the weight of anything placed upon it with an identical upward force. This is the normal thing for all good tables to do, up to the ultimate structural limit of their materials and construction, and it is known as the "normal force".
So the table in your question provides a normal force of 78.4 newtons. (d)
A neutron star is moving in outer space at 4,000 km/hr. What happened to the star that set it in motion on it's current course?
a
the friction in space slowed it down to 4,000 km/hr
b
an unbalanced force from a supernova set it in motion
c
it was shot further into space due to the velocity of objects around it
d
a balanced force acted on it and propelled it to 4,000 km/hr
Answers
Answer:
d
a balanced force acted on it and propelled it to 4,000 km/hr
Explanation:
For the neutrons star which is moving in outer space at 4,000 km/hr, it could only be possible as a result of the balanced force which had already acted on it. This is based on newton's law of motion which states that 'To every action, there is equal and opposite reaction'.