Answer:
Yes it is possible to control to some extent
Explanation:
Yes it is possible to control to some extent. Explanation: In general there are two types of magnets : permanent and temporary (electromagnets). ... On the other hand permanent magnet cannot be switched on and off but the magnetic properties can be altered event to an extent when it loses all its magnetic properties.
The efficiency of lever is always less than 100%why
Answer:
The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, the efficiency is always less than 100 percent.
How many atoms are in 3MgCl2?
Answer:
3MgCl2 has 9 atoms.
Explanation:
The Element Magnesium (Mg) has 3 atoms.
The Element Chloride (Cl) has 6 attoms.
Their fore 6 + 3 is 9 of course. 3MgCl2 has 9 atoms.
BTW: 3MgCl2 is a molecular compound as well as H2O and CO2.
Two people travel from Columbus to Cleveland, one by car at an average velocity of 90km/h, and one by plane at an average velocity of 300km/h. Can their displacements be equal
Answer:
Explanation:
Yes , their displacement may be equal .
Suppose the displacement is AB where A is starting point and B is end point .
The car is covering the distance AB by going from A to B on straight line . On the other hand plane goes from A to C , then from C to D and then from D to B . In this way plane reaches B from A on a different path which is longer than path of the car . In the second case also displacement of plane is AB . In the second case distance covered is longer but displacement is same that is AB .
Why are very high temperatures and pressures required for fusion to occur?
to generate the neutrons that are needed to break the nuclei
to overcome the repulsion between the protons in the nuclei that join
to maintain the proper conditions to keep the chain reaction going
to keep the uranium fuel separate from the control rods
Answer:
so as to over come the repulsion between the protons in nuclei that join
Explanation:
it requires high temperature so that the nucleus starts moving at rapid speed which in turn increases their kinetic
In nuclear reactions, very high temperatures and pressures required for fusion to occur so as to to overcome the repulsion between the protons in the nuclei that join.
What are nuclear reactions?There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
Learn more about nuclear reactions,here:
https://brainly.com/question/16526663
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Amoeba have mitochondria. What is the name of the process that breaks down glucose sugar into usable energy for the cell? (2 words)
Answer:
cellular respiration
Explanation:
Which do you think requires more Work, lifting a 100 N load a vertical distance of 2 m or lifting a 10 N load a vertical distance of 4 m?
Answer:
Lifting 100 N 2 meters is much more work.
Explanation:
Remark
The formula is F * d = W
Givens
F = 100 N
D = 2 m
or
F = 10 N
D = 4 m
Solution
Work = 100 * 2
Work = 200 Joules
Work = 10 * 4
Work = 40 J
Kate is pulling her doll in a wagon. Which arrow shows us the force of Kate pulling the wagon?
Answer:
3
Explanation:
Trust me its the right answer
help please asappp.
Answer:
Radio
Explanation:
As the stonger the waves get the more compressed they get
Refraction occurs when a wave changes______ as it passes through a different medium.
plsss help me
what factors affect electrostatic force?
Answer:
The first factor is the amount of charge on each object. The greater the charge, the greater the electric force. The second factor is the distance between the charges. The closer together the charges are, the greater the electric force is.
Explanation:
explain about the laws of reflection
Answer:
The law of reflection states that the angle of reflection equals the angle of incidence—θr = θi. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface.
Explanation:
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Camina con otro compañero, al mismo tiempo y al mismo paso. Quién se mueve tú o tu compañero? Razona tu respuesta
Answer:
Fricción.
Explicación:
Caminando con otro compañero al mismo tiempo y al mismo ritmo, el movimiento se produce debido a la fricción del suelo y la suela de los zapatos porque la fricción es la fuerza que ayuda en el movimiento de los objetos de un lugar a otro. Si no hay fricción entre el suelo y la suela de los zapatos, no podemos dar un paso por lo que podemos decir que la fricción nos mueve hacia adelante.
Ted lifts a 10N weight at a height of 1.5 m in 1 second. Johnny lifts a 10N weight at a height of 1.5 m in 2 second. Which statements are correct? A. Johnny and Ted did the same amount of work B. Ted did more work C. Johnny and Ted expanded the same power D. Ted expanded more power E Johnny did more work F. Johnny expanded more power
Answer:
he affirmations the correct ones are: A and D
Explanation:
To find out which expressions are correct, let's calculate the work and power done by each person
the expression for work is W = F and
the expression for power is P = W / t
In this case the work is positive because the beast is in the same direction of displacement.
Ted
W₁ = 10 1.5
W₁ = 15 J
P₁ = 15/1
P₁ = 15 w
Johnny
the job
W₂ = 10 1.5
W₂ = 15 J
the potential
P₂ = 15/2
P₂ = 7.5 w
therefore we see that the work of both is the same, but Ted developed twice as much power as Johnny
when resisting the affirmations the correct ones are: A and D
PLS HELP
1.) When there are equal forces from opposite directions acting on an object, the forces are said to be which of the following? (4 points)
A.) Positive
B.) Negative
C.) Balanced
D.) Gravitational
2.) If you want to cause an object to move, what should you do? (4 points)
A.) Apply balanced forces.
B.) Apply neutral forces.
C.) Apply potential forces
D.) Apply unbalanced forces.
Answer:
B
Explanation:
True or False – All transformations fit the Law of Conservation of Energy.
Answer:
The correct answer is true.
A 100 N force is applied to a pulley to lift a 500 N object. What is the actual mechanical advantage of the pulley?
Please help, I'm tired of trolls.
Please answer fast
A 50 kg boy jumps off the front of a 1.5 kg skateboard moving forward. Find the skateboard's velocity
immediately after the boy jumps, assuming that the skateboard's initial velocity is 3.5 m/s and the boy's
velocity when jumping off the front is 5 m/s?
Answer:
The speed is 1.35 m/s
Explanation:
(m1+m2) vi= m1+m2v2
(50+1.5) (3.5)=50 (5+v2) +1.5 v2
180.25= 250+ 51.5 v2
180.25- 250+ 51.5 v2
-69.75= 51.5 v2
v2= -1.35 m
5. Aunt Jane weighs 145 pounds. What is her weight in Newtons?
Answer:
i think its 644
Explanation:
A)This part controls the amount of light entering the eyes. A= Iris B= Pupil Give reason for your answer.
Answer:
Iris
Explanation:
Iris can be described as a part of the eyes which regulates the amount of light that enters the eye. The iris is made up of various muscles that control the size of the pupil
When a person is in a well-lighted room, the iris decreases the size of the pupil so that a low amount or medium amount of light is absorbed into the pupil. Also when an individual steps into a dark room the iris increases the size of the pupil so that a high amount of light penetrates the pupil.
Hence without the iris the amount of light that enters the eye cannot be controlled.
In which reaction are the atoms of elements rearranged?
A. a neutron fuses with plutonium-239 to form plutonium-240.
B. two isotopes of hydrogen fuse to form helium.
C. sodium combines with chlorine to form sodium chloride.
D. uranium-235 breaks apart into krypton, barium, and three neutrons.
Answer:
C. sodium combines with chlorine to form sodium chloride
Explanation:
Answer:
C. sodium combines with chlorine to form sodium chloride.
Explanation:
Why did you need a permanent magnet? What do you think would happen if you increased the
number of permanent magnets? (dc motor)
Permanent magnets are important for their industrial uses especially when it comes to power generation and electric motors. The induction process for turbines and generators needs permanent magnets to turn mechanical motion into energy.
Exposing magnetized magnets to opposing external fields produces a demagnetizing effect. This effect is most apparent in permanent magnet materials having a non-linear demagnetization curve, such as Alnico. ... Other factors such as SHOCK and VIBRATION have very little effect on today's permanent magnet materials.
Where is the magnet that causes Earth’s magnetic field? What is this magnet made of?
HELPPPP PLEASEE!
Answer:
The magnetic field of Earth is created by currents of electricity that flow in the molten center.
Explanation:
Which person has kinetic energy but does not have potential energy?
Answer:
a person walking on a flat side walk
Explanation:
hope this helped :)
If a car has a velocity of 85 km/hr, how long will it take to accelerate to 45 km/hr if the acceleration is -3 km/hr/sec?
Answer:
Time, t = 13.34 seconds.
Explanation:
Given the following data;
Initial velocity, u = 85km/hr to meters per seconds = 85*1000/3600 = 23.61 m/s
Final velocity, v = 45km/hr to meters per seconds = 45*1000/3600 = 12.5 m/s
Acceleration, a = -3 km/hr/sec to meters per seconds square = -3*1000/3600 = -0.833m/s²
To find the time;
Acceleration = (v - u)/t
-0.833 = (12.5 - 23.61)/t
-0.833t = -11.11
t = 11.11/0.833
Time, t = 13.34 seconds.
A cart with an initial velocity of 5.0 m/s experiences a constant acceleration of 2.0 m/s2. What is the cart's displacement during the first 6.0 s of its motion? *
If an element forms a 2+ ion, in which group of the periodic table would you expect to find it? A. 2 B. 1 O c. 17 D. 18
Answer:
A
Explanation:
It would be with the group 2 metals.
11. Improvement on communication skill is a
A. Social Benefits
B. Emotional Benefits
C. Mental Benefits
D. Physical Benefits
12. Reducing anxiety, depression, and negative mood.
A. Social Benefits
B. Emotional Benefits
C. Mental Benefits
D. Physical Benefits
13. Have stronger bones, muscles and joint and lower risk of developing osteoporosis.
A. Social Benefits
B. Emotional Benefits
C. Mental Benefits
D. Physical Benefits
Answer:
11.A
12.C
13.D
Explanation:
12.might be emotional benefits but they are often associated with our mental health , which is why I gave the answer C . its up to u now
A student observes a model of two bonded atoms. She is told that both atoms are nonmetals. Which of the following is a valid conclusion?
A. The student is looking at a model of atoms held together by a covalent bond.
B. The student is looking at a model of a metalloid.
C. The student is looking at a model of a crystal lattice.
D. The student is looking at a model of atoms held together by an ionic bond.
Answer:A
Explanation: it’s a covalent bond plus i just took mines
Point P is located 1.7 m from fixed point charge q. The electric field Ē at point P is 8.6 x
10-2 N/C, directed away from the point charge. What is the magnitude of q? Let the
electrostatic constant k = 8.99 x 10°N • m²/C2.
O
A. 2.8 10-11 C
0
B. 4.8 * 10-11 C
O.C. -4.8 x 10-11 C
D. 1.5 x 10-10
Answer:
2.8 × 10^-11 C
Explanation:
The computation of the magnitude of q is shown below;
The electric field at point P because of point charge Q is provided by,
E = 8.6 × 10^-2 N/C
And, the separation between charge Q and P is r = 1.7m
Now According to the Coulomb's law,
E = kQ ÷ r²
8.6 × 10^-2 = 9 × 10^9 × Q ÷ (1.7)²
8.6 × 10^-2 × 2.89 ÷ 9 × 10^9 = Q
Q = (8.6 × 2.89 ÷ 9) × 10^-11
Q = 2.76 × 10^-11 C
= 2.8 × 10^-11 C
What is the electric field created by a voltage of 85 V at a distance of 5.0 m?
Answer:
E = = 17
Explanation:
We will use the equation E = We plug in our known values