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Veseljchak [2.6K]
2 years ago
6

Billy ran 800m in 240s. What is his speed? Round to two decimal places Your answer

Physics
2 answers:
Serjik [45]2 years ago
8 0

Answer:

Speed=3.33m/s

Explanation:

Distance(d)=800m\\Time(t)=240sec\\Now,\\Speed=\frac{Distance}{Time} \\\\Speed=\frac{800}{240} \\\\Speed=3.33m/s

Ilia_Sergeevich [38]2 years ago
4 0

<u>Answer</u>:

Speed = 3.33 m/s

<u>Explanation</u>:

Formula:

Speed = distance / time

<em>Here distance is 800 metres and time is 240 seconds</em>

<em>Using the formula:</em>

Speed = 800 / 240

Speed = 3.33 m/s

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Explanation:

One way of classifying stars is by their temperature .

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Star and planet formation

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The scientific method means that all theories are put to the test. By measuring or calculating the temperature, age and composition of other planets and stars the theories can be tested. If observed values of these parameters are not predicted by theories, then the theories are wrong and need to be revised or replaced.

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According to the Law of Reflection, the angle of incidence the angle of reflection. O A. is greater than B. is less than C. equa
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Answer:

C. Equals

Explanation:

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Is energy matter? Is gravity matter? Why or why not
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Determine which heat transfers below are due to the process of conduction. I) You walk barefoot on the hot street and it burns y
Rudik [331]

I) You walk barefoot on the hot street and it burns your toes.

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II) When you get into a car with hot black leather in the middle of the summer and your skin starts to get burned.

Just like in the previous example, the hot leather is in direct contact with your skin (I guess if you're going to drive naked). Thermal energy from the leather will transfe to your skin, then to the rest of your body. This is also conduction.


III) A flame heats the air inside a hot air balloon and the balloon rises.

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IV) A boy sits to the side of a campfire. He is 10 feet away, but still feels warm.

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The answer is A) 1 and 2.

3 0
3 years ago
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An object is made of glass and has the shape of a cube 0.13 m on a side, according to an observer at rest relative to it. Howeve
Vlad1618 [11]

Answer:

v=0.9833\ c

Explanation:

The density changes means that the length in the direction of the motion is changed.

Therefore,

$\text{Density} = \frac{m}{lwh}$

Given :

Side,  b = h = 0.13 m

Mass, m = 3.3 kg

Density = 8100 kg/m^3

So,

$8100=\frac{3.3}{l \times 0.13 \times 0.13}$

$l=\frac{3.3}{8100 \times 0.13 \times 0.13}$

l = 0.024 m

Then for relativistic length contraction,

$l= l' \sqrt{1-\frac{v^2}{c^2}}$

$0.024= 0.13 \sqrt{1-\frac{v^2}{c^2}}$

$0.184=  \sqrt{1-\frac{v^2}{c^2}}$

$0.033=  1-\frac{v^2}{c^2}}$

$\frac{v^2}{c^2}= 0.967$

$\frac{v}{c}=0.9833$

v=0.9833\ c

Therefore, the speed of the observer relative to the cube is 0.9833 c (in the units of c).

3 0
3 years ago
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