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guajiro [1.7K]
3 years ago
6

If a system requires 150 J of input work and produces 123 J of output work, what's its efficiency? A. 72% B. 122% C. 82% D. 92%

Chemistry
2 answers:
Levart [38]3 years ago
6 0
The answer is C. Fam
STALIN [3.7K]3 years ago
4 0
The answer is C. 82......
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An automated filling machine is used to fill bottles with liquid detergent. A random sample of 20 bottles results in a sample va
taurus [48]

Answer:

No, there is no evidence that the manufacturer has a problem with underfilled or overfilled bottles, due that according our results we cannot reject the null hypothesis.

Explanation:

according to this exercise we have the following:

σ^2 =< 0.01 (null hypothesis)

σ^2 > 0.01 (alternative hypothesis)

To solve we can use the chi-square statistical test. To reject or not the hypothesis, we have that the rejection region X^2 > 30.14

Thus:

X^2 = ((n-1) * s^2)/σ^2 = ((20-1)*0.0153)/0.01 = 29.1

Since 29.1 < 30.14, we cannot reject the null hypothesis.

4 0
3 years ago
Read 2 more answers
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Sever21 [200]

Answer:1:En química, el número másico o número de masa es la suma del número de protones y el número de neutrones del núcleo de un átomo. Se simboliza con la letra A (el uso de esta letra proviene de alemán Atomgewicht, que quiere decir peso atómico, aunque sean conceptos distintos que no deben confundirse).

2:

4 0
3 years ago
Which is the smallest particle into which a compound can be broken down and still remain the same compound? A. atom B. mixture C
Andre45 [30]
The smallest would be a compound
4 0
2 years ago
3.<br> КОН<br> +<br> —<br> —<br> Н3РО4<br> 1<br> +<br> K3PO4<br> —<br> Н,0<br> —
expeople1 [14]
What does this mean?
3 0
2 years ago
A ball is rolling across the floor. Every 3 seconds it travels 12 meters. Its speed, therefore, is 36 m/s. Is this problem solve
kirill [66]
No because you are supposed to do this

d = t)v
T for time and V for velocity or acceleration so what you do is take the two numbers

D= 3/12 it goes 12 meters every 3 seconds so you devide 12/3
12 \div 3 = 4
So for every second the ball roles 4 meters!
Hope this helps! :)
7 0
3 years ago
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