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Juli2301 [7.4K]
3 years ago
6

A bar of metal had a volume of 4.5 cm^3 and a mass of 33 g. what is the density of the metal?

Physics
1 answer:
Schach [20]3 years ago
7 0

Density is defined as the ratio of mass and volume of an object

Density = \frac{mass}{volume}

mass = 33 g

Volume = 4.5 cm^3

Now we can use the formula of density

Density = \frac{33}{4.5}

Density = 7.33 \frac{g}{cm^3}

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Crystallization of solids​
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Answer:

A separation technique to separate solids from a solution. Crystallization can be defined as the process through which the atoms/molecules of a substance arrange themselves in a well-defined three-dimensional lattice and consequently, minimize the overall energy of the system.

Explanation:

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3 years ago
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A rock is dropped into a well. If you hear a splash 14 seconds later what was its speed
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Answer:

14 seconds

Explanation:

because you dropped it and it takes 14 seconds

4 0
3 years ago
The 10-kg block is held at rest on the smooth inclined plane by the stop block at A. If the10-g bullet is traveling at 300m/swhe
WARRIOR [948]

Answer:

6.8 mm

Explanation:

We are given that

Mass of block,m=10 kg

Mass of bullet,m_b=10 g=10\times 10^{-3} kg

1 kg=1000 g

Total mass of system,M=m+m_a=10+10\times 10^{-3}=10.01kg

Speed of bullet,u=300 m/s

\theta=30^{\circ}

By law of conservation of momentum

m_bucos\theta=Mv

v=\frac{m_bvcos\theta}{M}=\frac{0.01\times 300cos30^{\circ}}{10.01}=0.259m/s

According to law of conservation of energy

Change in kinetic energy of system=Change in potential energy of system

\frac{1}{2}Mv^2-0=Mgh-0

\frac{1}{2}(10.01)(0.259)^2=10.01\times 9.8 h

Where g=9.8 m/s^2

h=\frac{(0.259)^2}{2\times 9.8}=0.0034m

1m=100 cm

h=0.0034\times 100=0.34 cm

Distance traveled by block=d=\frac{h}{sin\theta}=\frac{0.34}{sin30^{\circ}}=0.68 cm=6.8 mm

1cm=10 mm

4 0
4 years ago
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5 0
3 years ago
Compared to the size and density of Earth, the Moon has a A. smaller diameter and lower density B. smaller diameter and higher d
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Answer:

(a) Moon has smaller diameter and lower density than earth

Explanation:

Moon has smaller diameter than earth earth has a diameter of 12742 km whereas moon has a diameter of 3474.21 km

So for density density is given by density=\frac{mass}{volume}

From the relation we can see that density is dependent on mass and volume directly proportional to mass and inversely proportional to diameter

But in case of earth and moon mass is more dominating than volume so density is less for moon than earth  

6 0
3 years ago
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