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3 years ago

What is The Difference between Accuracy and Precision?

2 answers:

7 0

In other words, accuracy describes the difference between the measurement and the part's actual value, while precision describes the variation you see when you measure the same part repeatedly with the same device

GrogVix [38]3 years ago

7 0

Answer:

Accuracy describes the difference between measurement and the parts actually value, while precision describes the variation you see when you measure the same part repeatedly with the same device.

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In testing an automobile tire for proper alignment, a technician marks a spot on the tire 0.190 m from the center. He then mount

Kaylis [27]

Complete Question

In testing an automobile tire for proper alignment, a technician marks a spot on the tire 0.190 m from the center. He then mounts the tire in a vertical plane and notes that the radius vector to the spot is at an angle of 33.0° with the horizontal. Starting from rest, the tire is spun rapidly with a constant angular acceleration of 1.50 rad/s2. (Assume the spot's position is initially positive, and assume the angular acceleration is in the positive direction.)

(a) What is the angular speed of the wheel after 1.20 s? rad/s

b) What is the tangential speed of the spot after 1.20 s?

(d) What is the angular position of the spot after 1.20 s?

Answer:

$w = 1.8 rad/sec$

$v =0.342 \ m/s$

$a_r = 0.6156\ m/s^2$

$\theta = 1.656 \ rad$

Explanation:

From the question we are told that

The distance of the spot from the center is $r = 0.190 \ m$

The angle of the radius vector with the horizontal is $\theta_o = 33^o = \frac{33\pi}{180} rad$

The acceleration is $\alpha = 1.50 \ rad/s^2$

The angular speed of the wheel after 1.20 s is mathematically represented as

$w =w_o + \alpha t$

Where $w_o$ is the initial angular speed of the wheel which is zero

Substituting values

$w = 0 + 1.5(1.20)$

$w = 1.8 rad/sec$

the tangential speed of the spot after 1.20 is mathematically represented as

$v = r w$

substituting values

$v = 0.190 * 1.8$

$v =0.342 \ m/s$

The magnitude of the total acceleration of the spot after 1.30 s is mathematically represented as

$a = \sqrt{a_r ^2 + a_t ^2}$

The radial acceleration is

$a_r = \frac{v^2}{r}$

substituting values

$a_r = \frac{(0.342)^2}{0.190}$

$a_r = 0.6156\ m/s^2$

The tangential acceleration is

$a_t = r \alpha$

substituting values

$a_t = 0.19 * 1.5$

$a_t = 0.285 \ m/s^2$

=> $a = \sqrt{0.6156^2 + 0.285 ^2}$

$a = 0.6784 \ m/s^2$

the angular position of the spot after 1.20 s is mathematically represented as

$\theta = \theta _o + w_ot + \frac{1}{2} \alpha t^2$

substituting values

$\theta = \frac{33 \pi}{180} + 0 + 0.5 * 1.5 * 1.2^2$

$\theta = 1.656 \ rad$

5 0

2 years ago

_________is a system that uses the reflection of underwater sound waves to detect objects.

abruzzese [7]

Answer:3-Sonar

Explanation:

Sonar system is used to detect the under water objects by using the deflection of sound waves.

Sonar is an acronym of Sound navigation ranging.Two types of sonar sets are used for working: active and passive. The active sonar system pushes out sound signals called pings, and then absorbs the return sound echo. Passive sound sets obtain sound echoes without transmitting their actual sound signals. Submarines are using sonar to track other vessels.

3 0

2 years ago

Work and energy have the same units because

yulyashka [42]

Answer:

A. the words "work" and "energy" are interchangeable.

Explanation:

Work and kinetic energy are interchangeable, so they are the same, ie. they have the same units. Your work can give kinetic energy to a body and a body with kinetic energy can produce work

8 0

3 years ago

The vertical ground reaction force (normal contact force) acting under a runner’s foot is 2,000 n, and the frictional forceis 60

anzhelika [568]

The resultant of the two forces, vertical ground reaction force and frictional force is 1907.8784 N.

<h3>What is triangle law of vectors?</h3>

When two vectors are represented by magnitude and direction, then its resultant is given by the closing side of the triangle.

Given the vertical ground reaction force N = 2000N and horizontal frictional force F = 600N, then the resultant will be

R = √[(2000)² + (600)²]

R = 1907.8784 N

Thus the resultant force is 1907.8784 N

Learn more about triangle law of vectors.

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8 0

2 years ago

Identify and describe the metal in table salt

Crazy boy [7]

Chemical formula for the table salt is NaCl, which is sodium chloride.

Sodium is a Group I metal, that forms an ionic bond with a non-metal, chlorine.

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3 years ago