determine the density in kg/m3 of a solid whose mass is 40 and whose dimension in centimetre are 30×4×3
1 answer:
Answer:
Density = 11.11 kg/m³
Explanation:
Given the following data;
Mass = 40 kg
Dimensions = 30×4×3 = 360 cm³ to m³ = 360/100 = 3.6 m³
Thus, volume = 3.6 m³
Now, we can find the density;
Density can be defined as mass all over the volume of an object.
Simply stated, density is mass per unit volume of an object.
Mathematically, density is given by the equation;
Substituting into the equation, we have;
Density = 40/3.6
Density = 11.11 kg/m³
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Answer:
Speed of the cars after the collision is 3.34 m/s.
Explanation:
It is given that,
Mass of one car, m₁ = 1500 kg
Velocity of this car, v₁ = + 30 m/s ( in east )
Mass of other car, m₂ = 3000 kg
Velocity of other car, v₂ = - 20 m/s (in south)
The two cars stick together after the collision. It is a case of inelastic collision. Let v is the speed of cars after collision. It can be calculated using the conservation of linear momentum as :
v = -3.34 m/s
So, the speed of the cars after the collision is 3.34 m/s. Hence, this is the required solution.