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Varvara68 [4.7K]

3 years ago

13

17. When people replace systems, even when they still work, this is an example of... *

2 answers:

Kitty [74]3 years ago

6 0

First off how is it automation, when the person who asked the question just said “when people REPLACE systems.” Automation is like the use of systems and machines. The person answered automation which is the toatal opposite of the answer, which is C, Manual labor. Manual labor is where humans work instead of the machines/systems.

So in simpler words......C.
Have a great day!

Law Incorporation [45]3 years ago

3 0

I'm gonna have to guess B) Automation sorry if I get it incorrect

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Help me find the natural logarithum of csch^-1 ((-1)/(2 sqrt(30)))

SVEN [57.7K]

The inverse hyperbolic cosecant of anything is a negative number.

In particular, csch⁻¹ [ (-1)/(2√30) ] = csch⁻¹ (≈ -0.0913) = ≈ -3.089

Whatever it is, negative numbers don't have logarithms.

3 0

4 years ago

A ball of mass m = 4.6 kg, at one end of a string of length L= 6.6 m, rotates in a vertical circle just fast enough to prevent t

VashaNatasha [74]

Answer:

v₂ = 17.98 m/s

Explanation:

given,

mass of ball = m = 4.6 Kg

length of string = L = 6.6 m

force acting toward the center is equal to the force exerted by centripetal acceleration

$m g = \dfrac{mv_1^2}{r}$

$v_1 = \sqrt{gr}$

now, calculating the speed of ball at the bottom of the circlr

work done by the gravity = change in kinetic energy

$- m g (2R) = \dfrac{1}{2}m(v_1^2-v_2^2)$

$-4 gR =v_1^2-v_2^2$

$-4 gR =g R-v_2^2$

$v_2^2 = 5 g R$

$v_2=\sqrt{5\times 9.8 \times 6.6}$

v₂ = 17.98 m/s

8 0

3 years ago

What three colors can be combined to produce any color within the visible spectrum

kramer

Answer:

red, green, and blue.

Explanation:

The primary colors of light that combine to produce any color within the visible spectrum are red, green, and blue.

7 0

4 years ago

Read 2 more answers

A hollow spherical iron shell floats almost completely submerged in water. The outer diameter is 58.2 cm, and the density of iro

vredina [299]

Answer:

0.556m

Explanation:

unit conversion

58.2 cm = 0.582 m -> the outer radius is 0.582/2 = 0.291 m

$7.87 g/cm^33 = 7.87 g/cm^33 * 1/1000 (kg/g) * 100^3 cm^3/m^3 = 7870 kg/m^3$

Let r be the inner diameter we can find the volume of the hollow part of the sphere using the following formula

$V_h = \frac{4}{3}\pi r^3$

The volume of the iron shell is the volume of the whole sphere subtracted by volume of the hollow part

$V_s = V - V_h = \frac{4}{3}\pi 0.291^3 - \frac{4}{3}\pi r^3 = \frac{4}{3}\pi(0.0246 - r^3)$

Let water density $\rho_w = 1000 kg/m^3$ , then the buoyant force is the weight of water displaced by the shell

$F_b = g\rho_w V = g1000\frac{4}{3}\pi(0.291^3) = g1000\frac{4}{3}\pi(0.0246)$

For the shell to almost completely submerged in water, its buoyant force equal to the weight of the shell

$F_b = W_s$

$g1000\frac{4}{3}\pi(0.0246) = g\rho_sV_s$

$g1000\frac{4}{3}\pi(0.0246) = g7870\frac{4}{3}\pi(0.0246 - r^3)$

$1000*0.0246 = 7870(0.0246 - r^3)$

$24.6 = 193.602 - 7870r^3$

$r^3 = (193.602 - 24.6)/7870 = 0.02147$

$r = \sqrt[3]{0.02147} = 0.278 m$

So the inner diameter is 0.278*2 = 0.556 m

3 0

3 years ago

Any material that allows thermal energy to pass through easily is a?

AveGali [126]

Any material that allows thermal energy to pass through easily is a conductor

3 0

4 years ago