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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

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 cooling effect inside a refrigerator is produced by

nlexa [21]

Actually, when the refrigeration liquid is vaporized, the cooling effect is produced

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3 years ago

The amplitude of a lightly damped oscillator decreases by 4.2% during each cycle. What percentage of the mechanical energy of th

ra1l [238]

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

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

7 0

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

alina1380 [7]

The correct answer for this would be "A car traveling the speed limit" this is because the car is not accelerating, and all the other answers are wrong because the objects in those are accelerating <span />

5 0

3 years ago

Read 2 more answers

Which of the following is true? A. Drivers entering a driveway or alley should yield to bicyclists and pedestrians on the sidewa

slega [8]

Explanation:

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8 0

3 years ago