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alexandr1967 [171]
4 years ago
12

Explain why the types of technology valued can vary.

Physics
2 answers:
Elan Coil [88]4 years ago
4 0
Over time, the types of technology can vary and be improved upon so that more advanced techniques become more valued. This could be the situation with mining whereby back in the 1500's in underground mines the rock was broken by fire setting ie lighting a fire below the rock face to heat up the rock and then throwing cold water on it to crack it, so that it could be dug by hand. With the advent of explosives, this all changed so that the rock could be blasted. The increase in advance rates for an underground heading have thus gone from 5-20 feet per month to up to 300meters (984 ft) per month for a 24/7 mining operation, which is a huge improvement.
nirvana33 [79]4 years ago
3 0
ANSWER: Over the years, technology has advanced a lot and has made our lives simpler. We have been seen technological advancements in almost everywhere starting from our workplace to our homes and also at streets.

A classic example of technological advancement can be how people communicate to each other. People previously had only the option of railroads for traveling purposes to distant places. Later, with the introduction of airline industry, people started traveling across countries for many reasons like for business meetings, meeting a relative etc. The entire crowd of business travelers shifted to other technological innovation to save their precious time and money. The technology that replaced the need to travel far across countries was Video Conferencing. A huge number of business travelers opted for this innovation in technology. This advancement also suppressed the cell phone industry which only allowed voice calls at that time.

Also, people used to write mails and used to send telegrams. The telephone came into scenario and gave people an option to communicate faster which previously used to take days to send a message. Then in the 1990's, the email was introduced and gave everyone a platform to send instant and free messages. This gained popularity in 1996-97 with Hotmail services. Later on, it got updated with instant messaging services across the globe like Whatsapp services. Thus, this is how technology varies and are valued accordingly by their usage in that era and the types of technologies grew independently in their respective fields and replaced the outdated ones.
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So power is considered as the rate of doing work. Base on the problem given, my analysis is that the machine who finish the work faster is machine C. Therefore, in order to finish the same amount of work in a short period of time you are going to expend the most power. My answer is Machine C. 
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3 years ago
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In a collision between two objects having unequal masses, how does magnitude of the impulse imparted to the lighter object by th
olasank [31]
<span>Both objects receive the same impulse.</span>
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A 55 kg track and field athlete has an average power output of 5.4 kW during the 200 meter dash. How quickly did she finish the
olga_2 [115]

The time taken for the athlete to finish the race is 20 s (Option A)

<h3>What is power? </h3>

Power is simply defined as the rate at which work is done. It can be expressed mathematically as

Power (P) = work (W) / time (t)

But

Work = weight × distance

Therefore,

Power = (weight × distance ) / time

<h3>How to determine the time </h3>
  • Mass (m) = 55 Kg
  • Acceleration due to gravity (g) = 9.8 m/s²
  • Weight = mg = 55 × 9.8 = 539 N
  • Power (P) = 5.4 KW = 5.4 × 1000 = 5400 W
  • Distance (d) = 200 m
  • Time (t) =?

Power = (weight × distance ) / time

5400 = (539 × 200) / t

5400 = 107800 / t

Cross multiply

5400 × t = 107800

Divide both side by 5400

t = 107800 / 5400

t = 20 s

Learn more about power:

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5 0
2 years ago
An egg is thrown nearly vertically upward from a point near the cornice of a tall building. The egg just misses the cornice on t
diamong [38]

Answer:

1. 18.5m/s

2. 17.5 m

3. 0 at its highest point

4. Direction is downwards

Explanation:

1. This egg is thrown vertically from a height

Yo = 0. This egg then falls to the point y = -30.0 at t = 5seconds

Y-Yo = V0t - 1/2gt²

-30-0 = V0(5)-1/2(9.8)(5²)

-30 = 5v0 - 4.9x25

-30 = 5V0 - 122.5

-30+122.4 = 5v0

V0 = 92.5/5

= 18.5m/s

<em><u>this </u></em><em><u>is </u></em><em><u>the </u></em><em><u>initial</u></em><em><u> </u></em><em><u>speed</u></em><em><u> of</u></em><em><u> the</u></em><em><u> </u></em><em><u>egg</u></em>

2. When the egg is at a maximum height it would have a velocity equal to 0

V² = V0² - 2*g*y

V = 0, V0 = 18.5, g = 9.8

0 = 18.5²-2x9.8*y

342.25-19.6y = 0

342.25 = 19.6y

Divide through by 19.6

Y = 342.25/19.6

Y = 17.5m

<em><u>this value is how high it rises above starting point</u></em>

3.

The magnitude of velocity is = 0 at its highest point

4.

This egg falls under gravity. Therefore the acceleration due to gravity has a constant magnitude and direction. Magnitude = 9.8m/s and it's direction is downwards.

5. Please check attachment for graph

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3 years ago
When a piece of aluminium foil is taken out of the oven and cools from 1000C to 500C. What is the change in temperature?
zmey [24]

Answer:

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Explanation:

When one object touches another heat moves through it (think of a saucepan on a hot stove). Aluminium foil is a great conductor of heat, which means it is a poor insulator when it is in direct contact with something hot.

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