Two very light1
neutral metal spheres (A and B) hanging from insulating string are at rest
touching each other. An insulated, positively charged rod is brought in contact with A (on the side
opposite from B) and then removed. (Assume the spheres do not move because of the normal force
between the rod and sphere, nor do the spheres move before the rod touches A.) How do the spheres
move? Explain.
Answer:
The spheres do not move.
Explanation:
Both spheres start neutral, meaning they have an equal number of positive and negative words.
The spheres are metal, so they are conductors. When the positively-charged rod touches sphere A, the negative charges in both spheres are attracted towards the rod, and the positive charges in both spheres are repelled away.
When the rod is removed, sphere A will have a negative charge, and sphere B will have a positive charge. The electrostatic force will pull the spheres together. Since they are already touching, the spheres will not move.
Samuel placed a plastic container upside down over a paperclip. He held a strong magnet up to the side of the bowl and the paperclip moved toward the magnet. Which best explains the result of Samuel's investigation. A. The magnet caused a balanced force on the paperclip. B. The magnet caused a non-contact force on the paperclip. C. The magnet increased the amount of energy in the paperclip. D. The magnet reduced the net force acting on the paperclip.
Answer:
The magnet caused a non-contact force on the paperclip.
Match the correct numbers and letters together please.
A wave in physics is a moving disturbance in the energy level of a field.
A transmitter is an electronic device that generates and amplifies a carrier wave, modulates it with a meaningful signal derived from speech, music, TV or other sources, and broadcasts the resulting signal from an antenna.
The antenna is an apparatus to receive or transmit electromagnetic waves and convert respectively to or from an electrical signal.
Receiver is one of the several electronic devices that receive electromagnetic waves, or signals transmitted as such.
Therefore, the correct description of a transmitter, a receiver and an antenna is given above.
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two harmonic waves are described by y1= (4m) sin (8/mx-300/s t) y2=(4m) sin (8/mx-300/s t-2) what is the wavelength of the resultant wave ?
The combined wave has a wavelength of 0.785 meters, which is the same as the combined wavelength of the two component waves. Duration is the interval between a wave's summit or valley and the succeeding wave.
What is a wave length?The distance between two successive peaks or troughs of a wave is measured in terms of its wavelength. It is often measured in meters, centimeters, or nanometers and is the inverse of frequency. The length of a wave is the distance it travels before repeating its pattern.
⇒ y₁ = ( 4 m)sin ( (8x/m) - (300t/s) )
⇒ y₂ = ( 4 m)sin ( (8x/m) - (300t/s) - 2 )
⇒ 0.785 m
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Reginald Esuke from Cameroon ran down a mountain slope in just 62.25 min. How much work was done if the power developed during Esuke’s descent was 585.0 W?
The amount of work which was done if the power developed during Esuke’s descent was 585.0 W is equal to 2,184,975 Joules.
What is work done?The work done (W) by an object can be calculated by multiplying the force acting on it by the perpendicular distance covered by the physical object over a specific period of time. This ultimately implies that, work done (W) and energy (E) have the same unit i.e Joules (J).
Mathematically, the work done (W) by an object can be calculated by using the following formula:
Work done = power × time
Additionally, we would convert the unit of time in minutes to seconds by multiplying by 60 seconds.
Substituting the given parameters into the work done (W) formula, we have the following;
Work done = 585.0 × 62.25 × 60
Work done = 2,184,975 Joules.
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Question:
(a) What is the electric field strength due to a point charge of 2.4 at a position 8.6 cm away from the charge?
(b) What is the magnitude of the electric force on a charge of −3.4 that is 8.6 cm away from the point charge in part a?
(c) Draw a sketch of the two charges, from parts a and b, and indicate the direction of the electric force on the second charge due to the original point charge.
(a) The electric field strength (E), due to a point charge is a measure of how much force an object would experience per unit of charge if it were placed in the field.
To calculate it, you need the charge of the point, the distance from the point charge, and a constant called Coulomb constant (k). The formula is E = k * q / r^2, where q is the charge, r is the distance and k is Coulomb constant. In this case, the charge is 2.4 Coulombs and the distance is 8.6 cm, when you calculate this you get E = 2.3*10^8 N/C.
So the electric field strength at a point 8.6 cm away from a point charge of 2.4 C is 2.3*10^8 N/C.
(b) The magnitude of the electric force on a charge of -3.4 microcoulombs that is 8.6 cm away from a point charge of 2.4 microcoulombs can be calculated using Coulombs law:
F = k * (q1*q2)/r^2
where k is Coulombs constant, q1 is 2.4 microcoulombs, q2 is -3.4 microcoulombs, and r is 8.6 cm.
The force magnitude is approximately equal to 1.97 * 10^-5 N.
Note that the direction of the force will be repulsive as the charges are opposite in sign.
(c) I won't draw a sketch for you, but to draw a sketch of two charges yourself:
You can draw a small circle for each charge, with the size of the circle representing the magnitude of the charge. Label the first charge with a + sign to indicate it's positive and the second charge with a - sign to indicate it's negative. Draw an arrow from the second charge towards the first charge to indicate the direction of the electric force, it should be pointing from the negative charge to the positive charge because the force is attractive.
I hope this helps some, I'm sorry I cannot answer completely.
What happens to Compton after
he jumps from the plane?
Answer:
In January 2012, Compton suffered a heart attack. On 25 February 2012, he died at one of his daughters' home in Washington. His wife Donna preceded him in death in 1994. Buck Compton was survived by two daughters and four grandchildren.
Explanation:
In January 2012, Compton suffered a heart attack. On 25 February 2012, he died at one of his daughters' home in Washington. His wife Donna preceded him in death in 1994. Buck Compton was survived by two daughters and four grandchildren.
The United States is heading for its biggest political and constitutional crisis since the Civil War, and in the next three or four years there is a high risk of mass violence, the collapse of federal authority, and the division of the country into Republican and Democratic enclaves.
In the statement above. i believe that the United States is heading for its biggest political and constitutional crisis since the Civil War, and in the next three or four years there is a high risk of mass violence is a false statement.
What is the Civil War about?The American Civil War, also known as the War Between the States, was a conflict that lasted from 1861 to 1865 and resulted in the deaths of an estimated 620,000 soldiers and civilians.
The war was fought primarily in the Southern United States and pitted the Confederate States of America, made up of 11 southern states that had seceded from the United States, against the United States of America (the Union). The main cause of the war was the disagreement over the institution of slavery and states' rights.
Therefore, It is important for individuals and leaders to engage in peaceful and democratic processes to address any issues or conflicts that may arise. It is not productive to speculate on potential crises or violence.
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See full question below
The United States is heading for its biggest political and constitutional crisis since the Civil War, and in the next three or four years there is a high risk of mass violence, the collapse of federal authority, and the division of the country into Republican and Democratic enclaves. Explain
The figure shows blocks with different masses hanging from a spring or combination of two
springs. All the springs are ideal and have spring constants of k. Which of the following
correctly ranks the systems in order of most stored elastic potential energy to least stored
Without the figure, it's difficult to determine the correct ranking of the systems in order of most stored elastic potential energy to least stored. The ranking would depend on the specific masses of the blocks and the displacement of the spring(s) in each system. The spring constant (k) is the same in all systems, so it does not affect the ranking.
In general, the system with the greatest stored elastic potential energy will be the one in which the spring(s) is most stretched or compressed. The more the spring(s) is stretched or compressed, the more potential energy it has stored. The mass of the block will also affect the amount of stored energy, as a heavier block will stretch or compress the spring(s) more than a lighter block.
Without the exact information about the masses and the displacement of the springs, It's not possible to determine the ranking of the systems.
A student wants to lift design a wheel and axle to lift a 400 N bucket of water from the bottom of a well. She already has a wheel with a 50 cm radius, and she is able to steadily apply an 80 N force. What should the radius of the axle be so that she can lift the bucket with this simple machine?
0.4 cm
64000 cm
10 cm
16000 cm
The radius of the axle is 10 cm. Option C is the answer.
Solving for the radius of the axle:The mechanical advantage of a wheel and axle is equal to the ratio of the radius of the wheel to the radius of the axle.
To lift a 400 N bucket of water with an applied force of 80 N, the mechanical advantage needed:
M.a = Weight
force applied
W = 400 N
F = 80 N
M.a = 400 N / 80 N
M.a = 5.
To get a mechanical advantage of 5, the radius of the axle should be 1/5th the radius of the wheel,
i.e r = 50 cm / 5
r = 10 cm.
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A fish tank is 20 inches by 12 inches by 12 inches. What is its volume in m * m ^ 3
As the fish tank is 20 inches by 12 inches by 12 inches, its volume is 47194744.32 mm³.
What is volume?The space that any three-dimensional solid occupies is known as its volume. These solids can take the form of a cube, cuboid, cone, cylinder, or sphere.
1 inch = 0.0254 meters.
20 inches = 20 × 0.0254 meters = 0.508 meters = 508 mm.
12 inches = 12 × 0.0254 meters = 0.3048 meters = 304.8 mm.
Hence, The volume of the fish tank = length × width × height
= 508 mm × 304.8 mm × 304.8 mm.
= 47194744.32 mm³
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The most powerful ice breaker in the world was built in the former Soviet Union. The ship is almost 150 m long, and its nuclear engine generates 56 MegaWatts (56 E^6 W) of power. How much work can this engine do in 1.0 hour? (1 hour = 3600 seconds)
The work done by the engine is 2.016×10¹¹ J.
What is work done?Work is said to be done whenever a force moves an object through a distance.
To calculate the work done by the engine, we use the formula below.
Formula:
W = Pt..................... Equation 1Where:
W = Work doneP = Powert = TimeFrom the question,
Given:
P = 56 mega Watts = 56×10⁶ Wt = 1 hours = 3600 secondSubstitute these values into equation 1
W = 56×10⁶×3600W = 2.016×10¹¹ JHence, the work done is 2.016×10¹¹ J.
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Using the density- temperature graph, compare the behaviour of water density and the density of any other liquid as the temperation increases
Two forces that are F1 =15N (east) and F2 = 7N (west) act on a body in a frictionless floor. The displacement of the body is 6 m, what is the work done by forces on the body?
Answer:
The net force acting on the body is F1 - F2 = 15 N - 7 N = 8 N (east). Since the displacement of the body is 6 m in the same direction as the net force, the work done by the forces on the body is W = Fnet x d = 8 N x 6 m = 48 J (Joules).
Explanation:
above
What is the impedance of a parallel circuit with an inductive reactance of 50 ohms, a capacitive reactance of 30
ohms, and a resistance of 100 ohms?
4
Select one:
O a. 200
O b. 300
c. 600
O d. 900
The impedance of the circuit is 200 ohms. Option A
What is the impedance?We know that the resistor would have to be that element that we find in the circuit which can be able to offer opposition to the flow of current in the circuit. It is also possible that the other components of the circuit could be able to offer an opposition to the flow of current and this is what we call the impedance of the circuit that is under consideration.
Then we have that;
Z = 1/√(1/R)^2 + (1/XL - 1/XC)^2
Z = impedance
R = the resistance
XC = capacitive reactance
XL = Inductive reactance
Where;
R = 100 ohms
XL = 50 ohms
XC = 30 ohms
Then;
Z = 1/√(1/100)^2 + (1/50 - 1/30)^2
Z = 1/√(0.0001) + (0.02 - 0.03)^2
Z =200 Ohms
The impedance has been obtained above.
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2. A football of mass 2.5kg is lifted up to the top of a cliff that is 180 m high. How much potential energydoes the foot ball gain?
Answer: 4.41 kN
Explanation:
Potential energy formula = mass x acceleration due to gravity x height
= 2.5 x 180 x. 9.8 = 4410 N or 4.41 kN
