What are 2 uses for this tiny electromagnet?

Physics

2 answers:

Ray Of Light [21]4 years ago

6 0

Electromagnets are used in all kinds of electric devices, including hard disk drives, speakers, motors, and generators, as well as in scrap yards to pick up heavy scrap metal. They're even used in MRI machines, which utilize magnets to take photos of your insides!

Nata [24]4 years ago

3 0

It's not necessarily so tiny. We can't really tell, but look at the size of the paper clips.

Anyway, it doesn't really matter.

If you actually HAD this machine, it could be very useful, in EXACTLY the situation shown in the picture: Your lab partner is a clumsy klutz ... during the electromagnet experiment, s/he emptied a whole 2-pound box of paper clips all over the floor of the lab, and the teacher wants every one of them picked up, RIGHT NOW ! Your partner gets down on knees and starts picking the clips up off the floor, one at a time. But YOU have this wonderful machine that you've been working with in the lab ! YOU get down on your knees, switch it ON, and you slowly wave the coil with the iron core back and forth, a few inches above the floor. All of the paper clips slide over to you and snap themselves onto the electromagnet, just like you see in the picture. THEN you hold it over the empty box and switch the power OFF. All the clips fall off of the magnet and into the box, and the teacher immediately gives you an A for that lab.

Or ... you could use it as a real-world teaching tool. Just carry it with you everywhere you go for a whole day, and try it on everything. Whatever you do all day, switch the electromagnet ON, and see what it sticks to and what it doesn't ..... bugs, spoons, books, toilet paper, smartphone, phone in the house, newspaper, car steering wheel, windows, computer, computer mouse, real mouse, pencil, earbuds, vape smoke, your blue hoodie, skateboard, scooter, tires, rocks, water, goldfish, donuts, Coke, Pepsi, raw burger meat, cooked burger meat, the bun, nails, nickels, dimes, quarters, pennies, dollar bills, coins from other countries, ketchup, drumstick from a drum, drumstick from a chicken, your baby brother, a notebook, a compass, the schoolbus, a plastic trash can, a bathroom faucet, a kitchen faucet, etc. etc. etc. Find 10 or 20 things that DO stick to it when it's ON, and 10 or 20 things that DON't. You'll learn so much that by the end of the day, you'll be able to LOOK at something and TELL whether it'll stick to the electromagnet or not, without even trying it. Your friends will be amazed.

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Suppose you take a 50gram ice cube from the freezer at an initial temperature of -20°C. How much energy would it take to complet

notsponge [240]

Answer:

The amount of energy required is $152.68\times 10^{3}Joules$

Explanation:

The energy required to convert the ice to steam is the sum of:

1) Energy required to raise the temperature of the ice from -20 to 0 degree Celsius.

2) Latent heat required to convert the ice into water.

3) Energy required to raise the temperature of water from 0 degrees to 100 degrees

4) Latent heat required to convert the water at 100 degrees to steam.

The amount of energy required in each process is as under

1) $Q_1=mass\times S.heat_{ice}\times \Delta T\\\\Q_1=50\times 2.05\times 20=2050Joules$

where

$'S.heat_{ice}$ ' is specific heat of ice = $2.05J/^{o}C\cdot gm$

2) Amount of heat required in phase 2 equals

$Q_2=L.heat\times mass\\\\\therefore Q_{2}=334\times 50=16700Joules$

3) The amount of heat required to raise the temperature of water from 0 to 100 degrees centigrade equals

$Q_3=mass\times S.heat\times \Delta T\\\\Q_1=50\times 4.186\times 100=20930Joules$

where

$'S.heat_{water}$ ' is specific heat of water= $4.186J/^{o}C\cdot gm$

4) Amount of heat required in phase 4 equals

$Q_4=L.heat\times mass\\\\\therefore Q_{4}=2260\times 50=113000Joules\\\\$ $\\\\\\\\$ Thus the total heat required equals $Q=Q_{1}+Q_{2}+Q_{3}+Q_{4}\\\\Q=152.68\times 10^{3}Joules$