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3 years ago

8

Hey there! I need help with this question, it's about electromagnets. No absurd answers, please. I will be flagging them. Thanks

!

2 answers:

lozanna [386]3 years ago

3 0

Answer: D Moreecethadev get's 5 stars, Thanks.

Explanation:

Answer is D.

VLD [36.1K]3 years ago

3 0

Answer: I think it’s C. because it definitely needs more wire but it also needs a higher voltage to pick up more, so I don’t know but I think C.

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3 years ago

Which best describes a difference between laser light and regular light?

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How much time would it take for the sound of thunder to travel 2000 meters if sound travels of 330 meters per sec

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3 years ago

Read 2 more answers

A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the 7) magnitude of the change

IRISSAK [1]

Answer:

Change in momentum will be -4.4 kgm/sec

So option (A) is correct option

Explanation:

Mass of the ball is given m = 0.10 kg

Initial velocity of ball $v_1=25m/sec$

And velocity after rebound $v_2=-19m/sec$

We have to find the change in momentum

So change in momentum is equal to $=m(v_2-v_1)=0.1\times (-19-25)=-4.4kgm/sec$ ( here negative sign shows only direction )

So option (A) will be correct answer

5 0

3 years ago

A glass window 0.33 cm thick measures 87 cm by 36 cm. How much heat flows through this window per minute if the inside and outsi

mojhsa [17]

Answer:

6.38 x 10^4 J

Explanation:

d = 0.33 cm = 0.33 x 10^-2 m, Area = 87 x 36 cm^2 = 0.87 x 0.36 m^2

ΔT = 14 degree C, t = 1 min = 60 second

K = 0.8 W / m K

Heat = K A ΔT t / d

H = 0.8 x 0.87 x 0.36 x 14 x 60 / (0.33 x 10^-2)

H = 6.38 x 10^4 J

7 0

3 years ago