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ad-work [718]
3 years ago
15

Which oftthe following is the least reliable source of background information for a scientific project? General internet site, g

overnment internet site, library reserve section, or scientific journal.
Physics
1 answer:
kenny6666 [7]3 years ago
7 0
General internet site
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A raft has a mass of 152 kg. When a
trapecia [35]

Answer:

72 kg

Explanation:

The computation of the mass of the person is shown below:

As we know that

Water displaced weight = Raft weight + person weight

P_w.V = M_r + M_p

where

P_w denotes the water density i.e. 1000 kg/m^3

V denotes the volume of the water in m^3

Now

1000 × 0.224 = 152 + M_p

M_p = 224 - 152

= 72 kg

3 0
2 years ago
Read 2 more answers
4. A steel cable spanning a river is 220.000 m long when the temperature is 30.°C.
romanna [79]

Answer:

219.9208  m

Explanation:

The new length is given by

New length= Original length *(1-Temperature change*coefficient of

thermal expansion of steel)

Here, the change in temperature is 30^{\circ}-0^{\circ}= 30^{\circ}

New length= 220.000(1-30*12x10^{-6}=219.9208m

Therefore, the new length will be 219.9208 m

5 0
3 years ago
A 4.2 m board with a mass of 19 kg is pivoted at its center of gravity. A helium balloon attached 0.24 m from the left end of th
storchak [24]

Answer:

The torque on the board = 11.8 Nm in the anti-clockwise direction

Explanation:

Please find attached the explanation to the answer given.

Download docx
6 0
3 years ago
A group of students left school at 8:00 am on a field trip to a science museum 90 miles away. Which best describes the average s
Aliun [14]

Answer:

45

Explanation:

because the equation for speed is distance divided by time! hope that helps gave a nice day!

7 0
2 years ago
3. What are the challenges of looking for Dyson spheres?
S_A_V [24]

1. it is difficult to search for it . Because infrared rays will never penetrate through earth atmosphere.

2. we are unaware of how it looks like and we only know it is red and will glow . A damaged star also looks like this.

3. Dust also makes is hard to detect Dyson spheres . So we will get confused between Dyson sphere and a star surrounded by dust.

5 0
3 years ago
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