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Veseljchak [2.6K]
4 years ago
6

Explain the difference between si base units and derived units. give an example of each

Physics
1 answer:
34kurt4 years ago
6 0
Base SI unit is the unit that used for simple quantity like time=second and length= meter. They only have one unit.
Derived unit is more complex because you multiply or divide at least two base SI, making it have more than 1 unit. The example could be velocity which was time/length = m/s
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A seesaw has an irregularly distributed mass of 50 kg, a length of 3.0 m, and a fulcrum beneath its midpoint. It is balanced whe
Simora [160]

Answer:

d_{CM} = 0.78 m

Explanation:

given,

mass of seesaw,m= 50 kg

length of seesaw, d = 3 m

mass of person on one end, m₁ = 60 Kg

mass of person on another end, m₂ = 86 Kg

position of center of mass = ?

System is in equilibrium

Clockwise moment is equal to anticlockwise moment.

m_1 g\dfrac{d}{2} + m g d_{CM} = m_2 g \dfrac{d}{2}

m_1 d + 2 m d_{CM} = m_2 d

d_{CM} = \dfrac{m_2 d-m_1 d}{2 m}

d_{CM} = \dfrac{86\times 3 - 60\times 3}{2\times 50}

d_{CM} = 0.78 m

hence, the position of center of mass from the fulcrum is 0.78 m on 60 Kg mass side.

4 0
3 years ago
What did isaac newton describe forces and motion
Mama L [17]
"An object in motion stays in motion, and an object at rest remains at rest unless acted upon by an unbalanced force" Said Sir Isaac Newton
Hope that helped! :)
5 0
4 years ago
The dimensions of the disk of our milky way galaxy are:.
Katen [24]

Answer:

According to studies, the milky way is approximately, "170,000–200,000 light-years (52–61 kpc) in diameter and, on average, approximately 1,000 ly (0.3 kpc) thick."

With that being said, it is safe to say that the dimensions are somewhere around 100,000 by 1,000

6 0
3 years ago
A crate of 890 kg gets raised to a height of 2.1m. Calculate the crate's gravitational potential energy.​
mars1129 [50]

Answer:

18,316.2

Explanation:

The formula for GPE is mgh, where

M = Mass of the object

G = Acceleration due to gravity (9.8 m/s^2 on Earth)

H = Height above ground

890 × 9.8 × 2.1 = 18,316.2

4 0
3 years ago
Read 2 more answers
A janitor standing on the top floor of a building wishes to determine the depth of the elevator shaft. They drop a rock from res
Bumek [7]

Answer:

Part a)

H = 26.8 m

Part b)

error = 7.18 %

Explanation:

Part a)

As the stone is dropped from height H then time taken by it to hit the floor is given as

t_1 = \sqrt{\frac{2H}{g}}

now the sound will come back to the observer in the time

t_2 = \frac{H}{v}

so we will have

t_1 + t_2 = 2.42

\sqrt{\frac{2H}{g}} + \frac{H}{v} = 2.42

so we have

\sqrt{\frac{2H}{9.81}} + \frac{H}{336} = 2.42

solve above equation for H

H = 26.8 m

Part b)

If sound reflection part is ignored then in that case

H = \frac{1}{2}gt^2

H = \frac{1}{2}(9.81)(2.42^2)

H = 28.7 m

so here percentage error in height calculation is given as

percentage = \frac{28.7 - 26.8}{26.8} \times 100

percentage = 7.18

5 0
3 years ago
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