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4 years ago

Zeros are always considered significant digits when they are to the left of the decimal point

Physics

1 answer:

maksim [4K]4 years ago

7 0

Answer:

Zeros to the left of a decimal can be insignificant place holders, such as in 0.043 (two significant figures).

They can be significant if they are between two digits who themselves are significant, such as in 101.000 (three significant figures).

In the case of a number like 1,000 we can see there is only one significant figure. The zero digits are not between sigfigs.

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PLEASE HELP, THANK YOU!.. :)

Firlakuza [10]

Answer:

First Reaction:

$^{234}U$ => $^{230} Th + ^{4}He$

Second Reaction:

$^{230} Th$ => $^{226} Ra + ^{4}He$

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$^{234} U$ => $^{226}Ra + 2( ^{4} He)$

8 0

3 years ago

A continuous line of charge lies along the x axis, extending from x = +x0 to positive infinity. The line carries positive charge

yawa3891 [41]

Answer:

E = k λ₀ / x₀, the field is in thenegative direction of the x axis (-x)

Explanation:

In this problem the electric field of a line of charge is requested, the expression for the electric field is

E = k ∫ dq / r²

where k is the Coulomb constant that you are worth 9 10⁹ N m²/C², that the charge and r the distance to the point of interest, in this case it is the origin (x = 0)

let's use the definite linear density

λ₀ = dq / dx

dq = λ₀ dx

we replace and integrate

E = k λ₀ ∫ dx / x²

E = k λ₀ ( -1 / x)

we evaluate the integral from the lower limit of load x = x₀ to the upper limit x = ∞

E = - k λ₀ (1 /∞ - 1 / x₀)

E = k λ₀ / x₀

as the field is positive the direction is away from the charges, so it is in the negative direction of the x axis (-x)

7 0

4 years ago

Periods ughhh

Lerok [7]

Answer:

1. acceleration value

2. 20 m

3a. when you throwing somethinb upward

3b. when a thing reach maximum height after throwing upward

4. (entire only) velocity = diaplacement/ time = 0/91 = 0

speed = distance/time = 200/91 = 2.2 m/s

5. (40-20)/4 = 5 m/s²

6. displacement using phytagoras get 50 m

velocity = displacement/time = 50/(6+4) = 5 m/s

7. 0, it turn back to the base

8. speed = distance/time = (240*2)/(4+6) = 48 km/h

9. s = (4+14)*3/2 =27 m

3 0

3 years ago

A skydiver prepares to jump out of a plane.Explain how gravity and air resistance will affect the motion of the sky diver before

aliina [53]

Explanation:

the skydiver will be pulled back when parachute is opened they will be moving at a constant speed..

4 0

3 years ago

In which of the following units is acceleration expressed

Fittoniya [83]

There are no correct choices on the list you provided. Any unit of acceleration is (a unit of length) divided by (a unit of time, squared).

4 0

4 years ago