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3 years ago

How many significant figures are in 107 moles of sodium

Physics

1 answer:

Blizzard [7]3 years ago

8 0

Answer:

3 significant figures

Explanation:

here zero is counted as one of the significant figures since it lies next to an integer.

hence the number has 3 sfg

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A lamp is 10% efficient. How much electrical energy must be supplied to the lamp each second if it produces 20 J of light energy

Leto [7]

Answer:

200J

Explanation:

200J is 100%, 10% of 200J would be 20J

3 0

3 years ago

If a lightning occurred exactly 1 mile from your location, how many seconds will it take for the sound waves created by the thun

timama [110]

Answer:

5 seconds

Explanation:

sound travels 1 km in roughly 3 secs so 1 mile in roughly 5 secs.

4 0

3 years ago

What is the carrying capacity of an ecosystem

abruzzese [7]

n ecological terms, the carrying capacity of an ecosystem is the size of the population that can be supported indefinitely upon the available resources and services of that ecosystem. Living within the limits of an ecosystem depends on three factors:

<span>the amount of resources available in the ecosystem,the size of the population, and<span>the amount of resources each individual is consuming.</span></span>

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3 years ago

What is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields.

Charra [1.4K]

Explanation:

Given that,

Electric field, E = 7900 V/m

Magnetic field, $B=9.1\times 10^{-3}\ T$

(a) Let v is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields. The magnitude of electric force and the magnetic force balance each other as :

$qE=qvB$

$v=\dfrac{E}{B}$

$v=\dfrac{7900\ V/m}{9.1\times 10^{-3}\ T}$

$v=8.68\times 10^5\ m/s$

(b) Let r is the radius of the electron orbit. The radius of the motion of electron is given by :

$r=\dfrac{mv}{qB}$

$r=\dfrac{9.1\times 10^{-31}\ kg\times 8.68\times 10^5\ m/s}{1.6\times 10^{-19}\ C\times 9.1\times 10^{-3}\ T}$

$r=5.4\times 10^{-4}\ m$

Hence, this is the required solution.

3 0

3 years ago

An object accelerates to a velocity of 230 m/s over a time of 2. 5 s. The acceleration it experienced was 42 m/s2. What was its

11Alexandr11 [23.1K]

An object accelerates to a velocity of 230 m/s over a time of 2. 5 s. The acceleration it experienced was 42 m/s2. Its initial velocity will be 125 m/s

final velocity = 230 m/s

time = 2.5 second

acceleration = 42 $m/s^{2}$

initial velocity = ?

acceleration = final velocity - initial velocity / time

42 = (230 - u) / 2.5

u = 125 m/s

Its initial velocity will be 125 m/s

To learn more about acceleration here :

brainly.com/question/12550364

#SPJ4

8 0

1 year ago