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mr Goodwill [35]
3 years ago
12

There are seven major levels of classification. Kingdom and phylum are just two of the levels. Which of the following are also m

ajor levels of classification Choose all answers that are correct. A. Class B. Order C. Family Or D. Level
Physics
1 answer:
umka2103 [35]3 years ago
5 0
The answer is B and C which is order and family! My sister had this question!
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The amplitude of a lightly damped oscillator decreases by 4.2% during each cycle. What percentage of the mechanical energy of th
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Answer:

V= A ω      maximum KE of object in SHM

V2 / V1 = .958     ratio of amplitudes since ω is constant

KE2 / KE1 = 1/2 m V2^2 / (1/2 m V1^2) = (V2 / V1)^2

KE2 / KE1 = .958^2 = .918

So KE2 = .918 KE1 and .082 = 8.2% of the energy is lost in one cycle

6 0
3 years ago
Ship A is 32 miles north of ship B and is sailing due south at 16 mph. Ship B is sailing due east at 12 mph. At what rate is the
Zielflug [23.3K]

Answer:

\dfrac{dz}{dt} =-5.6\ mile/h

Explanation:

distance between ship A and B = 32 mile

Ship A velocity in south, dx/dt = -16 mph

Ship B is sailing toward east with speed, dy/st = 12 mph

time = 1 hour

rate of change of distance between them = ?

x be the distance travel after t time

X = 32 + x

Let distance between them be z

now, using Pythagoras theorem to calculate distance between ships after 1 hours

z² = x² + y²

z² = (32 + x)² + 12²

z² = (32 - 16)² + 12²

z = √400

z = 20 miles

now, calculation of rate of change of distnace

z² = (32 + x)² + y²

differentiating both side w.r.t. time

2 z \dfrac{dz}{dt} = 2(32+x)\dfrac{dx}{dt} + 2 y\dfrac{dy}{dt}

z \dfrac{dz}{dt} =(32-16)\dfrac{dx}{dt} +y\dfrac{dy}{dt}

20\times \dfrac{dz}{dt} =16\times (-16) +12\times 12

\dfrac{dz}{dt} =\dfrac{-112}{20}

\dfrac{dz}{dt} =-5.6\ mile/h

hence, the rate is the distance between them changing at the end of 1 hour is equal to \dfrac{dz}{dt} =-5.6\ mile/h

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3 years ago
Which object has a constant speed? a racecar starting a race a car traveling the speed limit a bicycle coming to a stop a ball f
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Which of the following is true? A. Drivers entering a driveway or alley should yield to bicyclists and pedestrians on the sidewa
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