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3 years ago

A pump jack scaffold must be fitted with two ______ gripping mechanisms to prevent slippage.

1 answer:

5 0

A pump jack scaffold must be fitted with two positive gripping mechanisms to prevent slippage. Pump jacks are a uniquely designed scaffold consisting of a platform supported by movable brackets on vertical poles. The brackets are designed to be raised and lowered in a manner similar to an automobile jack. It is important to make sure that pump jack brackets have two positive gripping mechanisms to prevent any failure or slippage.

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when mary took a cold thick-walled glass out of the refrigerator and placed it in boiling water, the glass cracked. Explain why

goldfiish [28.3K]

The outer surface of the glass expands faster than the inside surface since glass is a fairly good thermal insulator. The outer surface tries to expand without the inner surface doing so at the same time. This is the secret of Pyrex glass. It is more conductive to heat and the inner and outer surface expand (and contract) at the same time.

4 0

3 years ago

PLLLZ HELP Which of the following is a seamount?

o-na [289]

1. The seamount of the following given option is option D, i.e. Loihi.

2. Hawaii would be the location for the most active volcano according to the picture given.

Answer: Option D and Option B

<u>Explanation:</u>

1. Loihi is a seamount, which is a uplifted mountain risen to a certain altitude from the oceanic floor, but has no connection with the sea floor and hence do not come into the purview of being an island. sea mount are thus known as the submarine peak.

2. According to the diagram given, active site for volcano is Hawaii. the reason being that the hot spot for the volcanic activity is found beneath the Hawaiin island, whose tremendous stress is experienced below the fault line of Hawaii making it the most active site for volcano as per the seismological findings.

4 0

4 years ago

A 10 N force and a 30 N force act on an object in opposite directions. What is the net force on the object? Sketch a free body d

yarga [219]

Answer:

$Net_{F}$ = 30N - 10N = 20N

Please mark as brainliest!

It is appreciated hope this helps!

Explanation:

I have put what a simple free body force diagram that you would need for this question below!

Just swap out the 5N and 3N with 30N and 10N :)

8 0

3 years ago

A soccer coach riding his bike reaches his office in xx hours. If he travels at 24 km/h, he reaches his office 5 minutes late. I

Elina [12.6K]

Answer:

18 km

Explanation:

Let 'd' be the distance between his house and office.

Normal time taken to reach the office = 'x' hours.

If speed is 24 km/h, time is increased by 5 minutes.

If speed is 30 km/h, time is reduced by 4 minutes.

We know that,

Time taken = Distance traveled ÷ Speed

So, when speed is 24 km/hr, time is increased by 5 minutes.

$1\ min = \frac{1}{60}\ h\\5\ min =\frac{5}{60}=\frac{1}{12}\ h$

So, time is $x+\frac{1}{12}$

Therefore,

$x+\frac{1}{12}=\frac{d}{24}\\\\x=\frac{d}{24}-\frac{1}{12}\\\\x=\frac{1}{12}(\frac{d}{2}-1)---------1$

Now, when speed is 30 km/h, time is reduced by 4 minutes or $\frac{4}{60}=\frac{1}{15}\ hours$

So, time now is $x-\frac{1}{15}$

Again using the time formula, we have

$x-\frac{1}{15}=\frac{d}{30}\\\\x=\frac{d}{30}+\frac{1}{15}\\\\x=\frac{1}{15}(\frac{d}{2}+1)-------------2$

Equations (1) and (2) are equal. So,

$\frac{1}{12}(\frac{d}{2}-1)=\frac{1}{15}(\frac{d}{2}+1)\\\\\frac{15}{12}(\frac{d}{2}-1)=\frac{d}{2}+1\\\\\frac{5d}{8}-\frac{5}{4}=\frac{d}{2}+1\\\\\frac{5d}{8}-\frac{d}{2}=1+\frac{5}{4}\\\\\frac{5d-4d}{8}=\frac{4+5}{4}\\\\\frac{d}{8}=\frac{9}{4}\\\\d=\frac{9\times 8}{4}=\frac{72}{4}=18\ km$

Therefore, the office is 18 km from his house.

6 0

3 years ago

Pls help me with this question

ryzh [129]

Answer:

16 ms2 is the answer for this question

8 0

4 years ago