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3 years ago

Which of the following values has the greatest number of significant figures? Justify your answer?

Physics

1 answer:

Bumek [7]3 years ago

7 0

The highest value with greatest significant figures is 0.0004200 grams.

Answer: Option A

Explanation:

Significant numbers are values, often measurements that contribute to the accuracy of the value. We'll start by calculating significant numbers with the first digit without zero. Calculate the number of significant digit from a series of numbers.

These have several rules to be followed for the calculation of number of significant figure at a given value. Following lead with zeros are not significant rules, we have, for option A, number of significant figure number values as 4. And, option D, we have the significant figure number value as 3. While for option B, significant figure all non-zero digits so as 3.

For option C, we have significant figure as 2 as rule is if the digit ends "0" and no decimal point, then all zeros between the position where decimal point is and non-zero numbers are not significant. Thereby, the greatest significant figure value be the option A following the rule of trailing zeros.

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The __________ lobe contains the area of the cortex involved in auditory processing called the primary __________ cortex. A. par

Vlada [557]

The temporal lobe contains the area of the cortex involved in auditory processing called the primary auditory cortex.

The temporal lobe is associated with auditory processing and olfaction.
The primary auditory cortex is the part of the temporal lobe which processes auditory information.

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3 years ago

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What effect does a catalyst have on a system in equilibrium?

Jet001 [13]

ANSWER:

What effect does a catalyst have on a system in equilibrium?

The system is unaffected.

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3 years ago

Synchronous communications satellites are placed in a circular orbit that is 3.59 107 m above the surface of the earth. What is

suter [353]

Answer: $0.223 m/s^{2}$

Explanation:

We can solve this with the Law of Universal Gravitation and knowing the acceleration due gravity $g$ of an object above the surface of the planet decreases with the distance (height) of this object from the center of the planet.

Well, according to the law of universal gravitation:

$F=G\frac{m_{E}m}{r^2}$ (1)

Where:

$F$ is the module of the force exerted between both bodies

$G=6.67(10)^{-11}\frac{m^{3}}{kgs^{2}}$ is the gravitational constant

$m_{E}=5.98(10)^{24} kg$ is the mass of the Earth

$m$ are the mass of each communications satellite

$r=R_{E}+h$ is the distance between the center of the Earth and the satellite

$R_{E}=6.38(10)^{6} m$ is the radius of the Earth

$h=3.59(10)^{7} m$ is the height of the satellite, measured from the Earth's surface

On the other hand, we know according to Newton's 2nd law of motion:

$F=mg$ (2)

Combining (1) and (2):

$G\frac{m_{E}m}{r^2}=mg$ (3)

Isolating $g$ :

$g=\frac{G M_{E}}{r^2}$ (4)

Remembering $r=R_{E}+h$ :

$g=\frac{G M_{E}}{(R_{E}+h)^2}$ (5)

$g=\frac{(6.67(10)^{-11}\frac{m^{3}}{kgs^{2}})(5.98(10)^{24} kg)}{(6.38(10)^{6} m+3.59(10)^{7} m)^2}$

Finally:

$g=0.223 m/s^{2}$

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3 years ago

Can a physical quantity have different dimensions in different systems of units?

Mars2501 [29]

Answer: yes a quantity have different dimensions in different system of units . No,because in different system of units doesn't change the quantity but it only changes the numerical.

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3 years ago

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A cat, walking along the window ledge of a new york apartment, knocks off a flower pot, which falls to the street 280 feet below

Harlamova29_29 [7]

H = 280 ft, the height of the flower pot.
g = 32 ft/s²

Neglect air resistance.
Note that 1 ft/s = 15/22 mi/h

The initial vertical velocity is zero.
Let v = the velocity with which the flower pot hits the ground.
Then
v² = 2gh
= 2*(32 ft/s²)*(280 ft)
= 17920 (ft/s)²
v = 133.866 ft/s

Also,
v = (133.866 ft/s)*(15/22 (mi/h)/(ft/s)) = 91.272 mi/h

Answer: 133.9 ft/s or 91.3 mi/h

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3 years ago