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3 years ago

Answer plz it a maath question

Mathematics

2 answers:

castortr0y [4]3 years ago

6 0

28x + 8y +2

have a good day / night . dear .

Leya [2.2K]3 years ago

4 0

Answer:

28x +8y +2

Step-by-step explanation:

-2( 3x+12y-5-17x-16y+4)

Combine like terms

-2( -14x-4y-1)

Distribute

28x +8y +2

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31.42cm

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A coin was flipped 150 times. The results of the experiment are shown in the following table:

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4 years ago

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3 years ago

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kondor19780726 [428]

32 plus 45 minus 6

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4 years ago

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A car has mass 1500 kg and is traveling at a speed of 35 miles/hour. what is its kinetic energy in joules? (Be sure to convert m

photoshop1234 [79]

Answer:

Factor by which kinetic energy increase = 4 times

Step-by-step explanation:

Given,

Mass of the car, v1 = 1500 kg

initial speed of car = 35 miles/h

$=\dfrac{35\times 1609.34}{3600}\ m/s$

= 15.64 m/s

Initial kinetic energy of the car is given by,

$k_1\ =\ \dfrac{1}{2}.m.v_1^2$

$=\ \dfrac{1}{2}\times 1500\times (15.64)^2\ joule$

= 183606.46 J

Final velocity of car v2 = 70 miles/hour

$=\dfrac{70\times 1609.34}{3600}$

= 31.29 m/s

So, final kinetic energy of car is given by

$k_2\ =\ \dfrac{1}{2}.m.v_2^2$

$=\ \dfrac{1}{2}\times 1500\times (31.29)^2$

= 734425.84 J

Now, the ratio of final to initial kinetic energy can be given by,

$\dfrac{k_2}{k_1}=\ \dfrac{734425.84}{183606.46}$

$=>\ k_2\ =\ 4k_1$

Hence, the kinetic energy will increase by 4 times.

7 0

3 years ago