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3 years ago

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NEED HELP!!!! 15 POINTS!!!!!!!

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telo118 [61]3 years ago

8 0

I believe A is the correct answer!!

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Name two methods scientist use to obtain empirical evidence

alisha [4.7K]

<span>The scientists use data and measurement to obtain empirical evidence. Data can be collected through direct observation or else experimentation. Empirical measurements and data can be gathered by using qualitative and quantitative methods. Empirical evidence contains the recording and analyzing the data which is a central part of scientific method.</span>

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3 years ago

The area of the piston to the master cylinder in a hydraulic braking system of a car is 0.4 square inches. If a force of 6.4 lb

Anit [1.1K]

Answer:

The force applied on one wheel during braking = 6.8 lb

Explanation:

Area of the piston (A) = 0.4 $in^{2}$

Force applied on the piston(F) = 6.4 lb

Pressure on the piston (P) = $\frac{F}{A}$

⇒ P = $\frac{6.4}{0.4}$

⇒ P = 16 $\frac{lb}{in^{2} }$

This is the pressure inside the cylinder.

Let force applied on the brake pad = $F_{1}$

Area of the brake pad ( $A_{1}$ )= 1.7 $in^{2}$

Thus the pressure on the brake pad ( $P_{1}$ ) = $\frac{F_{1} }{A_{1} }$

When brake is applied on the vehicle the pressure on the piston is equal to pressure on the brake pad.

⇒ P = $P_{1}$

⇒ 16 = $\frac{F_{1} }{A_{1} }$

⇒ $F_{1}$ = 16 × $A_{1}$

Put the value of $A_{1}$ we get

⇒ $F_{1}$ = 16 × 1.7

⇒ $F_{1}$ = 27.2 lb

This the total force applied during braking.

The force applied on one wheel = $\frac{F_{1} }{4}$ = $\frac{27.2}{4}$ = 6.8 lb

⇒ The force applied on one wheel during braking.

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3 years ago

NASA sends an unmanned lander to test conditions on the surface of Mars. What is the magnitude of the gravitational force acting

kozerog [31]

Answer:

The magnitude of the gravitational force acting on the lander on the surface of Mars is 512.46 N.

Explanation:

The Universal law of gravity is define as:

$F = G \frac{M.m}{R^{2}}$ (1)

Where F is the gravitational force, G is gravitational constant, M is the mass of Mars, m is the mass of the lander and R is the radius of Mars.

Before replacing the values in equation 1 it is necessary to express the radius of mars in terms of meters:

R = $3397 kmx\frac{1000 m}{1 km}$ ⇒ R = $3397000 m$

Finally, equation 1 can be used:

$F = (6.67x10^{-11} N.m^{2}/Kg^{2}) \frac{(6.42x10^{23} kg)(138.1 kg)}{(3397000 m)^{2}}$

$F = 512.46 N$

Hence, the magnitude of the gravitational force acting on the lander on the surface of Mars is 512.46 N.

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3 years ago

What is the ionosphere

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A ionosphere is a layer of the earths atmosphere that is ionized by solar and cosmic radiation <span />

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4 years ago

Two or more atoms joined into a single particular form a(n)

Yakvenalex [24]

<span>Two or more atoms joined into a single particular form </span><span>a molecule</span>

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3 years ago

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