3 years ago

How many nonradioactive elements can be found in smartphones?

1 answer:

4 0

What you need to do here is a little bit of research, namely into what smartphones are made of. Once you find each component, you can find out what elements are in each component, and from there simply find whatever elements are not radioactive.

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Calculate the speed of a car that travels 355km in 15 hours , a good answer please

Ludmilka [50]

Answer:

23.67 km / hr

Explanation:

car travels 355 km (d)

duration = 15 hrs (t)

average speed formula = v = d / t

v = 355 km / 15 hr

v = 23.67 km / hr

8 0

3 years ago

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A 0.03 kg baby sea turtle moves across the sand toward the ocean at 0.3 m/s. What is her kinetic energy in Joules?

lina2011 [118]

Answer:

.00135 j

Explanation:

K.E. = 1/2 m v^2

= 1/2 * .03 * .3^2 = .00135 j

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3 years ago

A sample of oxygen gas at 25.0Â°c has its pressure tripled while its volume is halved. What is the final temperature of the gas?

Marat540 [252]

Answer:

447 K

Explanation:

25 C = 25 + 273 = 298 K

Assuming ideal gas, we can apply the ideal gas law

$\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}$

$T_2 = T_1\frac{P_2}{P_1}\frac{V_2}{V_1}$

Since pressure is tripled, then $P_2 / P_1 = 3$ . Volume is halved, then $V_2 / V_1 = 0.5$

$T_2 = 298*3*0.5 = 447 K$

4 0

3 years ago

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Why do different substances have diffrent properties

Artist 52 [7]

Different elements require different levels of energy to make or break a bond

8 0

4 years ago

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An object initially at rest experiences an acceleration

lidiya [134]

Answer:

1.4m/s

Explanation:

Average velocity is the total distance covered divided by the total time taken.

Average velocity = $\frac{total distance }{time }$

Total time taken = 5s + 6s = 11s

The first distance covered = velocity x time = 1.4 x 5 = 7m

second distance covered = velocity x time = 1.4 x 6 = 8.4m

So;

Average velocity = $\frac{7 + 8.4}{11}$ = 1.4m/s

5 0

3 years ago