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3 years ago

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Which of the following caught in or caught between hazard poses the greatest risk when working in excavations and trenches? A. B

eing pinned B. Cave-ins C. Equipment falling into trenches D. Severing of underground utilities

2 answers:

RSB [31]3 years ago

6 0

I believe the correct answer is b.) cave-ins

Vlada [557]3 years ago

4 0

A being pinned if a big bolder falls on you

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A(n) 0.155 kg baseball is thrown with a speed of 18.4 m/s. It is hit straight back at the pitcher with a final speed of 18.4 m/s

Ivan

Answer:

5.704kg.m/s toward the pitcher

Explanation:

Impulse (Ft)= change in momentum

Impulse= m(v-u)

m=0.155 kg , v=18.4 m/s , u=18.4m/s

impulse=0.155[-(18.4) - (18.4)]

= 0.155(-36.8)

= -5.704 kg.m/s

the negative means towards the pitcher

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3 years ago

1. If the atomic number is 25, how many protons does it have?

ololo11 [35]

1. 25
2. 55-25 = 30

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3 years ago

An engineer wishes to design a roller coaster so that

nataly862011 [7]

To prevent cars from falling, the radius at the top of the circle should be

small such cars inverted at the top remain attached during motion.

Correct response;

The radius of the coaster can be <u>C) 20 m</u>

<h3>Method by which the above option is selected</h3>

Mass of roller coaster car, m = 500 kg

Speed at the top of the circle, v = 20 m/s

Required:

The maximum radius of the circular path the roller coaster car.

Solution:

$\displaystyle Centrifugal \ force, \, F_{c} = \mathbf{\frac{m \cdot v^2}{r}}$

Where;

r = The radius of the circular path.

Weight of the roller coaster car = m·g = The centripetal force

Where;

g = Acceleration due to gravity = 9.81 m/s²

At equilibrium, we have;

Centrifugal force = Centripetal force

$\displaystyle \frac{m \cdot v^2}{r} = \mathbf{ m \cdot g}$

Therefore;

$\displaystyle r = \mathbf{ \frac{v^2}{g}}$

Which gives;

$\displaystyle r = \frac{20^2}{9.81} \approx 40.77$

The maximum radius for safety of a roller coaster, r ≈ 40.77 meters

$\displaystyle Range \ of \ radius \ of \ the \ circle = \frac{40.77}{4} \leq Radius \ of \ circle \leq 40.77$

Which gives;

Range of the radius of the circle = 10.2 ≤ Radius of circle ≤ 40.77

The correct option for safety considerations is therefore;

<u>C) 20 m</u>

<em>The possible question options are;</em>

<em>A) 5 m B) 10 m C) 20 m D) 40 m E) 80 m</em>

Learn more about centripetal force here:

brainly.com/question/12674230

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3 years ago

Of the more than 2,000 known minerals approximately 95% of them belong to what mineral group?

Temka [501]

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3 years ago