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3 years ago

11

Tara's cell phone plan costs $39.00 a month, which includes 100 text messages. After she uses all of her text messages, it will

cost her $.15 per text message

1 answer:

vekshin13 years ago

5 0

I think it is $585.hope it is right

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What type of relationship does this graph show?

Schach [20]

Negative because the graph goes down

8 0

4 years ago

a bullet moving with a velocity of 100m/s pierce a block of wood and moves out with a velocityof 10 m/s.if the thickness of the

erma4kov [3.2K]

The emerging velocity of the bullet is <u>71 m/s.</u>

The bullet of mass <em>m</em> moving with a velocity <em>u</em> has kinetic energy. When it pierces the block of wood, the block exerts a force of friction on the bullet. As the bullet passes through the block, work is done against the resistive forces exerted on the bullet by the block. This results in the reduction of the bullet's kinetic energy. The bullet has a speed <em>v</em> when it emerges from the block.

If the block exerts a resistive force <em>F</em> on the bullet and the thickness of the block is <em>x</em> then, the work done by the resistive force is given by,

$W=Fx$

This is equal to the change in the bullet's kinetic energy.

$W=Fx=\frac{1}{2} m(u^2-v^2)......(1)$

If the thickness of the block is reduced by one-half, the bullet emerges out with a velocity v<em>₁.</em>

Assuming the same resistive forces to act on the bullet,

$F(\frac{x}{2} )=\frac{1}{2} m(u^2-v_1^2)......(2)$

Divide equation (2) by equation (1) and simplify for v<em>₁.</em>

$\frac{\frac{Fx}{2} }{Fx} =\frac{(u^2-v_1^2)}{(u^2-v^2)} \\\frac{100^2-v_1^2}{100^2-10^2} =\frac{1}{2} \\v_1^2=5050\\v_1=71.06 m/s$

Thus the speed of the bullet is 71 m/s

3 0

3 years ago

IN WHAT CONDITION DO SOUND ECHO

DerKrebs [107]

Answer:

The conditions necessary for hearing the echo. The distance between the sound source and the reflecting surface must not be less than 17 metres where the time period between hearing the original sound and its echo should not be less than 0.1 of a second.

6 0

3 years ago

Gas stored in a tank at 273 k has a pressure of 388kpa. The safe limit for the pressure is 825kpa at whst temperature Will gas r

vagabundo [1.1K]

Answer:

The answer to your question is T2 = 580.5 °K

Explanation:

Data

Temperature 1 = T1 = 273°K

Pressure 1 = P1 = 388 kPa

Pressure 2 = P2 = 825 kPa

Temperature 2 = ?

Process

1.- Use the Gay-Lussac law

P1/T1 = P2/T2

-Solve for T2

T2 = P2T1/P1

-Substitution

T2 = (825)(273) / 388

-Simplification

T2 = 225225 / 388

-Result

T2 = 580.5 °K

6 0

4 years ago

Charles Lindbergh, for his attempt at a solo transatlantic flight, was very reluctant to have any extra weight on his plane, he

CaHeK987 [17]

Very reluctant to have any extra weight on his plane when he attempted his solo transatlantic flight, Charles Lindbergh

Explanation:

““Very reluctant” appropriately modifies the subject of the Equal clause Charles Lindbergh.

Nevertheless, Charles Lindberg addresses the sentence in the question. And claim that, "It was... the justification and be reluctant" renders Lindberg's hesitation rather than Lindberg himself immune to the judgment.

In comparison to sounding wordy, this structure deliberately undermines the essence of the expression by moving the emphasis to a tangential topic.

3 0

3 years ago