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3 years ago

7

Julian ran 8 laps in 12 minuets. At that rate, how long will it take him to run 12 miles

1 answer:

LuckyWell [14K]3 years ago

8 0

It will take him 18 minutes b/c it takes him about 1.5 minutes to run 1 mile, therefore 1.5 times 12 is 18 minutes.

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Why are convenience samples are not desirable?

Igoryamba

Answer:

The disadvantages: Convenience samples do not produce representative results. If you need to extrapolate to the target population, convenience samples aren't going to get you there. ... Much larger convenience samples are not more accurate than small probability samples.

8 0

2 years ago

John's gross monthly salary is $2,000 starting next month, John receives a 15% raise power month. also starting next month, 30%

timama [110]

John's gross monthly salary is $2000.

John receives a 15% raise in his salary.

So first we have to find 15% of $2000.

15% of 2000 = $(2000)(\frac{15}{100})$

= $\frac{(2000)(15)}{100}$

= $\frac{30000}{100}$

= $300$

John's salary including the raise = $ $(2000+300)$ = $2300.

Now 30% of his monthly paycheck withheld for taxes.

30% of 2300 = $(2300)(\frac{30}{100})$

= $\frac{(2300)(30)}{100}$

= $\frac{69000}{100}$

= $690$

So the amount of tax deducted = $690.

John's net monthly income = $ $(2300-690)$ = $1610.

So we have got the required answer.

5 0

2 years ago

A spinning giant star of initial radius R1 and angular speed ω1 suddenly collapses radially inward reaching a new radius R2 = 0.

tiny-mole [99]

Answer:

K1/K2=4

Step-by-step explanation:

The kinetic energy of a rotating sphere is given by:

$K=\frac{I*\omega^{2} }{2}$

The moment of inertia of a solid sphere is given by

$I=\frac{2MR^{2} }{5}$

The initial kinetic energy is therefore

$K_1=\frac{2MR^{2}*\omega^{2} }{10}$

$K_1=\frac{MR_1^{2}*\omega^{2} }{5}$

The final kinetic energy is given by

$K_2=\frac{MR_2^{2}*\omega^{2} }{5}$

Therefore the relation K1/K2 if R2 = 0.5R1

$\frac{K_1}{K_2} =\frac{5M(R_1)^{2}*\omega^{2} }{5*M(0.5R_1)^{2} \omega^{2}}$

The text says nothing about the final angular velocity just the collapse of the collapse of the radius

$\frac{K_1}{K_2} =\frac{1 }{(0.5)^{2} }=4$

3 0

2 years ago

The perimeter of a rectangular tray is 28 inches. The length of the tray is 2 inches longer the width of the tray. Determine the

sergeinik [125]

Step-by-step explanation:

perimeter=28

length=2x

width=x

28=2(x+2x)

28=2x+4x

28=6x

28/6=6x/6

4.67=x

width=4.67

length=2×4.67

=9.34

4 0

3 years ago

Find the volume of the cone. Round your answer to the nearest tenth.

oee [108]

Answer:

15205.3

Step-by-step explanation: H=30 R²=484 3.14=π →= rounded up to tenth V = Volume

<em><u>formula (no numbers): H x R² x π ÷</u></em><u> </u> $\frac{1}{3}$ <u> (or 3) </u><em><u>= V</u></em>

<u><em>how i got the answer : 30 x 484 x 3.14 ÷ 3 = 15205.31 → 15205.3</em></u>

4 0

2 years ago