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4 years ago

Which of the following terms best describes air

Physics

1 answer:

g100num [7]4 years ago

5 0

I think that it is a mixture because air can contain anything.

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The brakes on your automobile are capable of creating a deceleration of 4.6 m/s^2. If you are going 114 km/h and suddenly see a

drek231 [11]

Answer:

The minimum time to get the car under max. speed limit of 79 km/h is 2.11 seconds.

Explanation:

$a=\frac{V_f-V_0}{t}$

isolating "t" from this equation:

$t=\frac{V_f-V_0}{a}$

Where:

a= $-4.6m/s^2$ (negative because is decelerating)

$V_f= 79 km/h$

$V_0= 114 km/h$

First we must convert velocity from km/h to m/s to be consistent with units.

$79\frac{km}{h}*\frac{1000m}{1 km}*\frac{1h}{3600s}=\frac{79*1000}{3600}=21.94 m/s$

$114\frac{km}{h}*\frac{1000m}{1 km}*\frac{1h}{3600s}=\frac{114*1000}{3600}=31.67 m/s$

So;

$t=\frac{V_f-V_0}{a}=\frac{21.94 m/s-31.66m/s}{-4.6 m/s^2}=2.11 s$

7 0

4 years ago

Actinium-226 has a half-life of 29 hours. If 10g of actinium-226 disintegrates over a period of 145 hours,

Masteriza [31]

Answer: d) 312.5 mg

Explanation:

This problem can be solved using the Radioactive Half Life Formula:

$A=A_{o}.2^{\frac{-t}{h}}$

Where:

$A$ is the remaining amount of Actinium-226

$A_{o}=10 g$ is the initial amount of Actinium-226

$t=145 h$ is the time elapsed

$h=29 h$ is the half life of Actinium-226

Knowing this, let's find $A$ :

$A=(10 g) (2)^{\frac{-145 h}{29 h}}$

$A=0.3125 g \frac{1000 mg}{1 g}=312.5 mg$

4 0

4 years ago

Se pune<br>Numerical problems<br>Convert 100ºC to Kelvin scale

IgorC [24]

Answer:

373 K

Explanation:

To convert from °C to kelvin, you add the value to 273

Therefore,

100°C = (100+273)K

= 373K

5 0

4 years ago

You start at (8, 1). You move right 2 units. Where do you end?

ivann1987 [24]

I'm pretty sure should be shifting your transformation those two units to the right from the original function.

Moving right = subtracting

Moving left = adding

4 0

3 years ago

Svetlanka [38]

Answer:

North and east are at 90 degree, equation becomes

Explanation:

(2x 2)+[2(x+5)] 2=50 2

on solving, we get

x=12.366km/h

4 0

3 years ago