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g100num [7]
3 years ago
10

(1 pt) this problem is an example of critically damped harmonic motion. a hollow steel ball weighing 4 pounds is suspended from

a spring. this stretches the spring 18 feet. the ball is started in motion from the equilibrium position with a downward velocity of 4 feet per second. the air resistance (in pounds) of the moving ball numerically equals 4 times its velocity (in feet per second) . suppose that after t seconds the ball is y feet below its rest position. find y in terms of t. take as the gravitational acceleration 32 feet per second per second. (note that the positive y direction is down in this problem.) y=
Physics
1 answer:
Zepler [3.9K]3 years ago
3 0
<span>Answer: Hooke's Law along with Newtons second Law of motion. x"+(a/m)x'+(k/m)x=F(t)/m x"+(256)x'+(96)x=0 F=-kx F=-4 x=1/3 mg=4 m=4/32 m=1/8 -4=-k* (1/3) k=12 x"+(256)x'+(96)x=0 y=C1e^(4*(1018)^(1/2)-128)*t+C2e^(-4*(...</span>
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A balloon that has been rubbed on wool has a negative charge. When the balloon is held over—but not touching—some bits of paper,
alexandr402 [8]

Answer:

This process is known as static electricity

Explanation:

When balloon is rubbed on the wool , a negative charge is usually formed. When the balloon is then held over—but not touching—some bits of paper, some of the bits jump up to the balloon. The bits which jump up to the balloon are positive charged and we know that unlike charges attract.

This process explains static electricity which is when the charges on a material are not in a balanced state.

5 0
3 years ago
Which of the following is an example of rolling friction?
il63 [147K]

Answer:

O bike tires on the road as you ride

Explanation:

is the rolling friction

7 0
3 years ago
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On an ice skating rink, a girl of mass 50 kg stands stationary, face to face with a boy of mass 80 kg. The children push off of
andrey2020 [161]

Answer:

Pretty sure its -4.8%

Explanation:

Others asked this question and got this as an answer.

5 0
3 years ago
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If the moon is a full moon tonight what will be the moon one week later waxing or waning
tatiyna

-- Starting from nothing (New Moon), the moon's shape grows ('waxes')
for half of the cycle, until it's full, and then it shrinks ('wanes') for the next
half of the cycle.

-- The moon's complete cycle of phases runs 29.53 days . . . roughly
four weeks.

-- So, beginning from New Moon, it spends about two weeks waxing until
it's full, and then another two weeks waning until it's all gone again.
 
-- After a Full Moon, the moon is waning for the next two weeks.  So it's
definitely <em>waning</em> at <em><u>one week</u></em> after Full.


5 0
3 years ago
If Faraday had used a more powerful battery in his experiments with electromagnetic induction, what effect would this have had o
dmitriy555 [2]

Answer:

The value of current generated would increase.

Explanation:

Electromagnetic induction is the process by which an electromotive force is induced due to a variation of magnetic field.

The induced current is directly proportional to rate at which the coil cuts the magnetic field. Using more powerful battery in the experiment would increase the rate at the the coil cuts the magnetic field, therefore increasing the rate of variation in the magnetic field. This effect would cause a greater deflection on the galvanometer's scale, showing an increase in the current generated.

This experiment proves that an alternating current can be produced from magnetic field.

6 0
4 years ago
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