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1 year ago

An object weighing 2.7n while in air and 1.2n when completely immersed in water.find the relative density of the object

Physics

1 answer:

Elden [556K]1 year ago

8 0

Answer:

1.8 = relative density (there are no units for relative density)

Explanation:

It displaces water equal to it's volume and gets buoyancy equal to that amount of water

2.7 - 1.2 = 1.5 N of buoyancy

density of water = 1 gm /cc

1.5 N = m (9.81)

m of water displaced = .1529 kg

152.9 cc of water will produce this buoyancy....this is the volume of the object

find mass of object 2.7 = m (9.81) shows m = .2752 kg = 272.5 gm

density = mass/ volume = 272.5 / 152.9 = 1.8 gm / cc

Relative to water (which is 1 gm / cc) the relative density is 1.8

====> it is 1.8 times denser than water and will sink when in water....

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Let's see

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1 year ago

A dog of mass 10 kg sits on a skateboard of mass 2 kg that is initially traveling south at 2 m/s. The dog jumps off with a veloc

Tasya [4]

Answer:

17 m/s south

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$u_2$ = Velocity of skateboard

In this system the linear momentum is conserved

$(m_1+m_2)v+m_1u_1+m_2u_2=0\\\Rightarrow u_2=-\dfrac{(m_1+m_2)v+m_1u_1}{m_2}\\\Rightarrow u_2=-\dfrac{(10+2)2+10\times 1}{2}\\\Rightarrow u_2=-17\ m/s$

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3 years ago

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Answer:

D). Last option is the correct choice.

Explanation:

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2 years ago

A camcorder has a power rating of 16 watts. If the output voltage from its battery is 9 volts, what current does it use?

Sphinxa [80]

Because of the parameters that we are given in the question, the right current formula that should be used for this physics problem is:
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I = Current
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8 0

2 years ago