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3 years ago

14. What is the standard deviation for the numbers 75,83,96,100,121 and 125?

Physics

1 answer:

seraphim [82]3 years ago

3 0

Answer:

2√109 about 20.88

Explanation:

The mean of this set of numbers is (75+83+96+100+121+125)/6 is 100. Next step is ((75-100)^2+(83-100)^2+(96-100)^2+(100-100)^2+(121-100)^2+(125-100)^2)/6 this result is called deviation. Square root the deviation(436) then you set the standard deviation.

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Three children are at work.one is pushing a chair, another is pushing the sofa and the third one is pushing an empty trolley .wh

kari74 [83]

Answer:sofa

Explanation:the weight of the mass of that object can be heavy (er) than the rest

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3 years ago

The compass is a small bar magnet that’s free to spin. Based on what you observed, is the coil of wire with current passing thro

OverLord2011 [107]

Answer:

yes, it is a magnet.

Explanation:

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2 years ago

At highway speeds a car can accelerate at 1.7 m/s2.

Vaselesa [24]

Answer: 2.5 seconds

Explanation:

We know that the acceleration is:

a(t) = 1.7 m/s^2

To get the velocity function, we must integrate over time, and we will get:

v(t) = (1.7m/s^2)*t + v0

Where v0 is the initial velocity, in this case, we assume that we start at 23.6m/s, then the initial velocity is:

v0 = 23.6 m/s

Then the velocity equation is:

v(t) = (1.7m/s^2)*t + 23.6 m/s

Now we want to find the value of t such v(t) = 27.8 m/s

Then:

v(t) = 27.8 m/s = (1.7m/s^2)*t + 23.6 m/s

27.8 m/s - 23.6 m/s = (1.7m/s^2)*t

4.2 m/s = (1.7m/s^2)*t

4.2m/s/(1.7m/s^2) = t = 2.5 s

Then at that acceleration, you need 2.5 seconds.

6 0

2 years ago

The temperature at which all molecular motion stops is

34kurt

Answer:

Zero Kelvin

Explanation:

The average kinetic energy of the particles in a gas is related to the absolute temperature of the gas by (for an ideal monoatomic gas):

$E_K = \frac{3}{2}kT$

where

k is the Boltzmann constant

T is the absolute temperature

The average kinetic energy is the energy possessed by the particles due to their motion; we see that this energy becomes zero when T = 0, which means when the substance reaches a temperature of zero Kelvin. Therefore, this means that at this temperature all the particles stop moving.

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2 years ago

True or False: Dimensional analysis can give you the numerical

Serjik [45]

Dimensional analysis is a method of checking the dimensions of each value in an equation. I will give you an example.

$E=mc^2$

Is a know equation which equates energy and mass. So our question is, is this true or not? The method is following:

knowing that c has the dimension of [m/s] and m has [kg], what is the dimension of E? So here the dimensional analysis begins.

$E = mc^2 \Rightarrow [E] = \text{kg} \cdot \left( \frac{\text{m}} {\text{s}}\right)^2 = \text{kgms}^{-2}$

This can be used also to solve "equations" to prove certain dimensions of unknown constants.

4 0

2 years ago