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raketka [301]
3 years ago
13

I need help....and please explain how you got it

Mathematics
1 answer:
ycow [4]3 years ago
3 0
I can help you! What is your problem?
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Calculate the velocity of a moving train with a mass 10,000kg and 150,000J of energy.
Viefleur [7K]
Kinetic energy possessed by moving train is E_k = 150000J.

And mass m = 10000kg.

The formula for kinetic energy is E_k = \frac{m\times v^2}{2}.

Solve for velocity:

E_k = \frac{m\times v^2}{2}\implies 2E_k = m\times v^2

v^2=\frac{2E_k}{m}\implies \underline{v = \sqrt{\frac{2E_k}{m}}}

Now put in the data:

v = \sqrt{\frac{2\times150000J}{10000kg}}\approx5.48\frac{m}{s}
5 0
3 years ago
-36 as a fraction in simplest form
Cerrena [4.2K]

Answer:

-1/2

Step-by-step explanation:


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3 years ago
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"Suppose that you are a city planner who obtains a sample of 20 randomly selected members of a mid-sized town in order to determ
frosja888 [35]

Answer: 2.093

Step-by-step explanation:

As per give , we have

Sample size : n= 20

Degree of freedom : df= n-1=19

Significance level : \alpha: 1-0.95=0.05

Since , the sample size is small (n<30) so we use t-test.

For confidence interval , we find two-tailed test value.

Using students's t-critical value table,

Critical t-value : t_{\alpha/2, df}=t_{0.025,19}=2.093

Thus, the critical value for the 95% confidence interval = 2.093

4 0
3 years ago
Subtract:(40+9)-(30+2)
Georgia [21]

Answer:

17

Step-by-step explanation:

49-32=17

Cud u make me brainliest? Im desperate. Thanks!

Hope this helps!

4 0
3 years ago
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(3x-8)(2xsquared4x-9) multiply and write the result in descending order
RSB [31]
Hello there, you can proceed with the multiplication of these factors using the FOIL method (which stands for first, outer, inner and last) multiply I assume that by descending order, you mean by decreasing power. If it were so, the answer is 6(x^3)12(x^2)-16(x^2)32x-27x+72. 
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3 years ago
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