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Aloiza [94]
4 years ago
15

Scientific knowledge is both durable and open to change. In your own words, explain why scientific knowledge may be open to chan

ge. Include two examples where this might occur.
Physics
1 answer:
kramer4 years ago
3 0
Science is open to change because scientists agree that there are no absolute truths, only the best explanations for the data

there are specifically two cases when science can change:
-new data is discovered (for example new skeleton makes us revise the known history of homo species)

-a new model is proposed that fits the data better (such as the heliocentric model of Copernicus)
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a 55.0 kg cheerleader uses an oil-filled hydraulic lift to hold four 130 kg football players at a height of 0.800 m . the diamet
suter [353]

The diameter of the football player's piston is 0.55 m

Given that the mass of the cheerleader(m) is 55 kg, mass of football player to be hold (M) is 130 kg, height of the players (h) is 1.30 m, radius of the piston corresponding to the diameter (r) is 0.09 m, Diameter of football player's piston (R), P1 is Pressure on the cheerleader's side, P2 is Pressure on the football player's side

Using Pascal's law,

This law states that if there is a change at a point of a body immersed in a fluid then that change will spread thoroughly to each and every point of the body.

The formula of hydraulic system is,

P1= P2

F1/A1 = F2/A2

mg/πr^2 = 4Mg/πR^2

m/r^2=4M/R^2

R^2=4M×r^2/m

By plugging the values, we get.,

R^2=(4×130×0.09^2)/55

R^2=4.21/55=0.076

R=√0.076 = 0.275 m

Hence, diameter of football player's piston is 0.55 m

Learn more about Hydraulic lift here

brainly.com/question/19052774

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8 0
1 year ago
Whos 18 and a boy whos smart and plays sports i need your help<br>message me
zalisa [80]

Answer:

yes

Explanation:

6 0
3 years ago
Two parallel square metal plates that are 1.5 cm and 22 cm on each side carry equal but opposite charges uniformly spread out ov
Mumz [18]

Answer:

The number of excess electrons are on the negative surface is 4.80\times10^{10}\ electrons

Explanation:

Given that,

Distance =1.5 cm

Side = 22 cm

Electric field = 18000 N/C

We need to calculate the capacitance in the metal plates

Using formula of capacitance

C=\dfrac{\epsilon_{0}A}{d}

Put the value into the formula

C=\dfrac{8.85\times10^{-12}\times(22\times10^{-2})^2}{1.5\times10^{-2}}

C=0.285\times10^{-10}\ F

We need to calculate the potential

Using formula of potential

V=Ed

Put the value into the formula

V=18000\times1.5\times10^{-2}\ V

V=270\ V

We need to calculate the charge

Using formula of charge

Q=CV

Put the value into the formula

Q=0.285\times10^{-10}\times270

Q=76.95\times10^{-10}\ C

Here, the charge on both the positive and negative  plates

Q=+76.95\times10^{-10}\ C

Q=-76.95\times10^{-10}\ C

We need to calculate the number of excess electrons are on the negative surface

Using formula of number of electrons

n=\dfrac{q}{e}

Put the value into the formula

n=\dfrac{76.95\times10^{-10}}{1.6\times10^{-19}}

n=4.80\times10^{10}\ electrons

Hence, The number of excess electrons are on the negative surface is 4.80\times10^{10}\ electrons

8 0
3 years ago
A gun can fire a bullet at 540 m/s. If the gun is aimed at an angle of 55o above the horizontal and fired, what will be the hori
lisabon 2012 [21]

Answer:

Explanation:

The <u>initial</u> vertical velocity is 540sin55° = 442.342103... 442 m/s

The <u>initial</u> horizontal velocity is 540cos55° = 309.731275... 310 m/s

In the real world, both initial velocities would be reduced by air resistance and vertical velocity will be altered by gravity.

5 0
3 years ago
What's the difference between (mu k) and (mu s)
Stolb23 [73]
(mu s) is the coefficient of kinetic friction, <span> (mu k) is a normal force,</span>
7 0
3 years ago
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