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Pavel [41]
2 years ago
14

Madelyn wanted to learn what sorts of things around the house are magnetic. She took a magnet around and touched it to many thin

gs to see if it tried to stick. Here are the items she tried and what she found. What can Madelyn conclude from the above results?
A. All silver objects are magnetic. B. Not all metals are magnetic. C. All magnetic metals are silver. D. All metals are magnetic.
Physics
1 answer:
madreJ [45]2 years ago
7 0

Answer:

b.

Explanation:

i just finished a chapter about this

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Alexeev081 [22]
D=rt
when biker A catches biker B, the time they've been riding is the same, so 
t=t, or d/r=d/r
the rates are 6.4 and 4.7, so
d/6.4=d/4.7
biker B is 34m ahead, so 
(d+34)/6.4=d/4.7
multiply both sides by 6.4*4.7:
4.7(d+34)=6.4d
4.7d+=6.4d+159.8
1.7d=159.8
d=94 meters

Another way to think of it is that biker A gains 1.7 meters on B every second (6.4-4.7=1.5), so the time it'll take for him to gain 34 meters is 34/1.7=20 seconds. In that time, biker B travels 4.7*20=94 meters
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3 years ago
Dish-shaped reflectors are used to steer microwaves in order to establish communications links between nearby buildings. Those r
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A "screen" or even just a set of parallel bars are highly reflective to electromagnetic waves as long as the open spaces are small compared to the wavelengths.

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2 years ago
A car tire rotates with an average angular speed of 32 rad/s. In what time interval will the tire rotate 3.5 times? Answer in un
stiks02 [169]

Answer:

\Delta t = 0.687\ s

Explanation:

given,

Angular speed of the tire = 32 rad/s

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now,

Time interval of the car to rotate 7π rad

using equation

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\Delta t=\dfrac{7\pi}{32}

\Delta t = 0.687\ s

Time taken to rotate 3.5 times is equal to 0.687 s.

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dangina [55]

Answer:

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3 years ago
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