Question

Why aren't permanent magnets really permanent?

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Science
Physics

Related Physics Q&A

Find answers to questions asked by students like you.

Q: The pulley system shown in the figure (Figure 1) is used to lift a 52-kg crate. Note that one chain ...

A:    

Q: Why is the magnitude of the electric field zero midway between identical point charges?

A: It is because two equal and opposite electrical forces are acting towards each other. As both the po...

Q: A supertrain of proper length 100 m travels at a speed of 0.95c as it passes through a tunnel having...

A: Click to see the answer

Q: Does charge flow through a circuit or into a circuit? Explain.

A: A circuit is a closed loop in which electrons can travel.

Q: A home experimenter wants to make a 1Ω resistor from a 1 mm diameter carbon rod from a mechanical pe...

A: Given Resistance R = 1 ohm Diameter D = 1 mm = 1 x 10-3 m Resistivity ρ = 3.5 x 10-5 ohm.m

Q: Constants A loaded tractor-trailer with a total mass of 4100 kg traveling at 3.2 km/h hits a loading...

A: Given Mass m = 4100 kg Initial velocity u = 3.2 km/h Final velocity v = 0 m/s Duration t = 0.58 s

Q: What condition is necessary for a process to be adiabatic?

A: Click to see the answer

Q: If you rub an inflated balloon against your hair and place it against a door, by what mechanism does...

A: When a neutral thing is rubbed along with another neutral than due to gain some energy the surface a...

Q: The acceleration of a ball as it rolls down a ramp is 4 m/s2. The ball is referred to 2 s after it s...

A: Click to see the answer

Q: A violin string playing the note 'A' oscillates at 440Hz. What is the period of the string's oscilla...

A: Click to see the answer

Q: Why is it dangerous to touch the terminals of a high voltage capacitor even after the charging circu...

A: A capacitor can store energy  equal to  (1/2)CV2  which is very high for high voltage.   For a high ...

Q: A car accelerates from rest at 4 m/s2. What is the velocity of the car after 4 seconds?

A: Click to see the answer

Q: Why do objects float in liquids denser than themselves?Explain.

A: When an object is submerged in a liquid, it experiences a buoyant force. The value of the buoyant fo...

Q: The doorbell on your house requires a 12 volt alternating current. A transformer having a primary wi...

A: Click to see the answer

Q: What is the DeBroglie wavelength of a 1,200 kilogram corvette traveling at a rate of 25 meters per s...

A: Click to see the answer

Q: Two objects (m1 = 5.35 kg and m2 = 3.10 kg) are connected by a light string passing over a light, fr...

A: Mass of the object 1,

Q: If you stand next to a wall on a frictionless skateboard and push the wall with a force of 40 N, how...

A: Click to see the answer

Q: Item 9 A0.30 kg billiard ball traveling at a speed of 13 m/s strikes the side rail of a pool table a...

A: Mass of the billiard ball,

Q: A 20 ohm resistor and a 60 ohm resistor are connected in parallel to a voltage source. If the curren...

A: Click to see the answer

Q: What generally happens to the temperature of rising air? Of sinking air?

A: Click to see the answer

Q: A Carnot engine is operated between two heat reservoirs at temperatures 520 K and 300 K. If the engi...

A: Click to see the answer

Q: What evidence (i.e., predictions and observations) might change scientists’ minds about astrology?

A: Astrology has not demonstrated its effectiveness in controlled studies and has no scientific validit...

Q: The strong man can withstand the tension force exerted by the two horses pulling in opposite directi...

A: Click to see the answer

Q: A particle is moving around in a circle and its position is given in polar coordinates as x = Rcosθ,...

A:  

Q: Between current and voltage , which remains the same for a 10 ohm and a 20 ohm resistor in parallel ...

A: Voltage is constant in parallel combination in the circuit.

Q: What beat frequency will occur when a 370Hz and 374 Hz sound source are sounded together?

A: Click to see the answer

Q: A concave lens refracts parallel rays in such a way that they are bent away from the axis of the len...

A: (a) Only diagram A is correct and light rays passing through optical center are not deviated. In dia...

Q: A Carnot engine operates between 170 degrees C and 20 degrees C. How much ice can the engine melt fr...

A: Click to see the answer

Q: A 2.0-kg block slides down a frictionless incline from point A to point B. A force (magnitude P = 3....

A: Click to see the answer

Q: What is the effect on the current in a wire if both the voltage across it and its resistance are hal...

A: Click to see the answer

Q: A boy pulls a 5-kg cart with a 20-N force at an angle of 30° above the horizontal for a length oftim...

A: Click to see the answer

Q: If the voltage impressed across a circuit is held constant while the resistance doubles, what change...

A: Click to see the answer

Q: Two people are at the gym having a debate about how much energy is required to bench press a certain...

A: Answer It doesn't matter how fast you lift.  

Q: Sam, whose mass is 68 kgkg , straps on his skis and starts down a 58 mm -high, 20∘20∘ frictionless s...

A: Click to see the answer

Q: In the figure above, block M2 = 20 kg is on a ramp of theta = 25 degrees and the coefficient of fric...

A: Consider the free-body diagram of the blocks-pulley system.

Q: Two identical cars collide head on. Each car is traveling at 100 km/h. The impact force on each car ...

A: Click to see the answer

Q: A car has a mass of 1700 kg, a drag coefficient of 0.35, a rolling resistance coefficient of 0.01, a...

A: It is given that

Q: A proton moves with a speed of 0.985c. (a) Calculate its rest energy.  MeV (b) Calculate its t...

A: a) The rest mass energy is, b) The value of the total energy is,  

Q: An electron has a momentum with magnitude three times the magnitude of its classical momentum. (a) F...

A:   (a)

Q: A point moves with deceleration along the circle of radius R so that at any moment of time its tange...

A: The tangential acceleration equals the centripetal acceleration as the particle moves with decelerat...

Q: A 10,000-watt motor operates an elevator weighing 5000 newtons. Assuming no frictional losses, how h...

A: Click to see the answer

Q: Calculte the power of a hair dryer that operates on 120V and draws a current of 10A?

A: Click to see the answer

Q: Here the stone is sliding down a friction-free incline. (a) Identify the forces that act on it, and ...

A: Click to see the answer