Which of the following is a common ground water contaminant

The precision of a laboratory instrument is ± 0.05 g. The accepted value for your measurement is 7.92 g. Which measurements are

skelet666 [1.2K]

Answer:

7.89 7.91

Explanation:

The ranges of measurement lie between 7.92-0.05 and 7.92+0.05

7.87g and 7.97g

3 0

3 years ago

Read 2 more answers

A Ferris wheel has radius 5.0 m and makes one revolution every 8.0 s with uniform rotation. A person who normally weighs 670 N i

DaniilM [7]

Answer:

The apparent weight of the person as she pass the highest point is $N = 458.8 \ N$

Explanation:

From the question we are told that

The radius of the Ferris wheel is $r = 5.0 \ m$

The period of revolution is $T = 8.0 \ s$

The weight of the person is $W = 670 \ N$

Generally the speed of the wheel is mathematically represented as

$v = \frac{2 \pi r}{T }$

substituting values

$v = \frac{2 * 3.142 * 5}{8 }$

$v = 3.9 3 \ m/s$

The apparent weight (the normal force exerted on her by the bench) at the highest point is mathematically evaluated as

$N = mg - \frac{mv^2}{r}$

Where m is the mass of the person which is mathematically evaluated as

$m = \frac{W}{g}$

substituting values

$m = \frac{670}{9.8}$

$m = 68.37 \ kg$

So

$N = 68.37 * 9.8 - \frac{68.37 * {3.93}^2}{5}$

$N = 458.8 \ N$

5 0

3 years ago

If a person is walking along at 1.4m/s. How long will it take that person to walk one time around a high school track?

ratelena [41]

Answer:

285.7s

Explanation:

Given parameters:

Speed of the person = 1.4m/s

Unknown:

Time it takes to walk one time round the track = ?

Solution:

The circumference of the track is 400m for a standard pitch.

Now;

Speed = $\frac{distance}{time}$

Time = $\frac{distance }{speed }$

Now insert the parameters;

Time = $\frac{400}{1.4}$ = 285.7s

8 0

3 years ago

What work is done by a system on its environment when an ideal gas is maintained at a constant pressure of 200 newtons/meter2 du

Crank

Answer:

Work done done by a system on its environment is W=40 Joules

Explanation:

Given:

Ideal gas is maintained at a constant pressure $P=200 \frac{N}{m^{2}}$

Change in Volume $d v= -0.2 m^{3}$

To find:

Work done by a system during an Isobaric Process

Solution:

In a Isobaric Process, constant pressure is maintained, $P=200 \frac{N}{m^{2}}$

According to the formula,

work done $\bold{W=P \times d v}$

Substitute the values of pressure and change in volume in the above formula,

$=200 \times -0.2$

$=40 \text { Joules }$

Result:

Work done done by a system W= -40 Joules

8 0

3 years ago

Read 2 more answers

In the chemical reactions of chemosynthesis, microscopic organisms use heat and inorganic compounds to produce food for themselv

zhuklara [117]

D. endothermic

Explanation:

Since the chemosynthesis reaction uses up heat and other inorganic compounds to produce food for themselves, the process is endothermic.

In an endothermic reaction, heat is absorbed from the surrounding.
The surround will then become colder at the end of the reaction.
Since the chemosynthesis reaction uses up heat, it is an endothermic reaction.
Exothermic reactions liberates heat to the surrounding.
The surrounding becomes hotter at the end of the change.

learn more:

Enthalpy changes brainly.com/question/10567109

#learnwithBrainly

7 0

3 years ago