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3 years ago

Explain how a theodolite works.

1 answer:

5 0

The theodolite is a precision measuring device used to measure horizontal and vertical angles. It works with a combination of: (1) optical plummets, which is used to ensure that it is placed exactly vertical above; (2) internal spirit, which ensures that it is levelled to the horizon; and (3) graduated circles, one vertical and one horizontal, which is used to measure actual angles. The mounted telescope can swivel horizontally and vertically. If this is adjusted correctly, accurate measurements can be obtained.

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A potter spins his wheel at 0.98 rev/s. The wheel has a mass of 4.2 kg and a radius of 0.35 m. He drops a chunk of clay of 2.9 k

Bad White [126]

Answer:

$v_{f,w} = 1.791\,\frac{m}{s}$ , $v_{f,c} = 0.972\,\frac{m}{s}$

Explanation:

The situation can be modelled by applying the Principle of Angular Momentum Conservation:

$I_{w} \cdot \omega_{o} = (I_{w} + I_{c})\cdot \omega_{f}$

The final angular speed is:

$\omega_{f} = \frac{I_{w}}{I_{w}+I_{c}}\cdot \omega_{o}$

$\omega_{f} = \left(\frac{\frac{1}{2}\cdot (4.2\,kg)\cdot (0.35\,m)^{2} }{\frac{1}{2}\cdot (4.2\,kg)\cdot (0.35\,m)^{2} + \frac{1}{2}\cdot (2.9\,kg)\cdot (0.19\,m)^{2}}\right)\cdot (0.98\,\frac{rev}{s} )\cdot \left(\frac{2\pi\,rad}{1\,rev} \right)$

$\omega_{f} \approx 5.116\,\frac{rad}{s}$

The tangential velocities of the wheel and the clay are, respectively:

$v_{f, w} = (0.35\,m)\cdot (5.116\,\frac{rad}{s} )$

$v_{f,w} = 1.791\,\frac{m}{s}$

$v_{f, c} = (0.19\,m) \cdot (5.116\,\frac{rad}{s} )$

$v_{f,c} = 0.972\,\frac{m}{s}$

5 0

3 years ago

The first formal laboratory for research in psychology was established by B.F. skinner

guajiro [1.7K]

False, it was Wilhelm Wundt that founded the first formal laboratory for research in psychological studies.

*** B.F Skinner is known for inventing the operant conditioning chamber. ***

8 0

3 years ago

You fire a projectile 35° above horizontal with an initial velocity of 200m/s. It lands in a valley 300m below the launch point.

Brilliant_brown [7]

Answer:

See below

Explanation:

Vertical component of initial velocity = 200 sin 35° = 114.72 m/s

then use position formula a = 9.81 m/s^2

0 = 300 + 114.72 t - 1/2 (9.81)(t^2)

use quadratic formula with a = - 4.905 b = 114.72 c = 300

to find t = 25.76 seconds

To find the range

( horizontal distance the projectile lands from launch point)

Horizontal component of initial velocity 200 cos 35 = 163.83 m/s

( it flies horizontally at this speed for 25.76 seconds <==found above)

163.83 m/s * 25.76 s = 4220.3 meters

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2 years ago

What is the type of intermolecular force in methylated spirits

Olin [163]

. Methylated spirits have ethanol as a base but may include methyl alcohol (methanol) as part of the denaturing process.

7 0

3 years ago

Negative effects of restricting roles in a democratic society

Oxana [17]

Answer:

it could lead to riot

it could lead to uncertainty of life and property

5 0

3 years ago

Read 2 more answers