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Gala2k [10]
3 years ago
11

What is the mass of a substance with a density of 9g/cm3 and a volume of 4cm3

Physics
1 answer:
Kazeer [188]3 years ago
5 0

Answer:

p= 3 g/cm³

density formula: p= m/V; p= p, m= 9 g, V= 3

p= (9)/(3)

p= 3

p= 3 g/cm³

Explanation:

plz mark bainliest

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3 years ago
14.0 m uniform ladder weighing 490 N rests against a frictionless wall. The ladder makes a 65.0°-angle with the horizontal. (a)
Mkey [24]

Answer:

The horizontal reaction force is 230.3 N.

Explanation:

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Length l= 14.0 m

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Angle = 65°

Weight of firefighter F'= 850 N

Height l'= 4.10 m

Suppose horizontal force magnitude N direction vertical force magnitude N direction

We need to calculate the horizontal reaction force

Horizontal reaction force = normal reaction from wall

Vertical reaction force = weight of ladder +weight of man

F=490+850

F=1340\ N

We need to calculate the moment about bottom is zero

N\times l\sin\theta=F\times\dfrac{l}{2}\cos\theta+F'\times l'\cos\theta

Put the value in the equation

N\times14\sin(65)=490\times7\cos(65)+850\times4.10\cos(65)

N=\dfrac{490\times7\cot(65)+850\times4.10\cot(65)}{14}

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4 0
3 years ago
The energy provided each hour by heat to the turbine in an electric power plant is 9.0×10^12 J. If 5.4 × 10^12 J of energy is ex
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Answer:

60 %

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Efficiency is defined as the ratio of output power  to the input power.

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3 0
3 years ago
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