Hello!
There are actually four states of matter. The three main ones are solids, liquids and gasses. The fourth one is called plasma.
Solids have a definite shape and volume.
Liquids have a definite volume but not shape.
Gas doesn’t have a definite volume or shape.
Plasma is like gas but made of electricity charged particles and very hot.
Explanation:
D = M/V
We rearrange this equation to get V = M/D
So 14 g/7 g/mL,
the grams cancel out, and we're left with 2 mL.
D is the answer.
Answer:
Explanation:
Mass of crate m = 5.26kg
Mass of crewman M = 60.9 kg
velocity of crate downwards u = 1.5 m/s
Height of ravine H = 28.6 m
Height of crate when crewman slips h = 15.9 m .
When crewman slips , Both M + m will have a common acceleration of
a = mg / ( M+m )
= (5.26 x 9.8 ) / ( 5.26 + 60.9 )
= 0.78 m / s²
We can calculate the final velocity of crate after going down by height 15.9 m from the following formula
V² = u² + 2ah
= 1.5² + 2 x 0.78 x 15.9
V = 5.2 m/s
The crew will have both horizontal and vertical velocity.
Horizontal velocity will have acceleration of .78 m/s² with distance travelled
is 15.9 m
v² = 0 + 2 x .78 x 15.9
v = 4.98 m /s
Vertical velocity will be created by free fall of 15.9 m
v² = 2 g h
2 x 9.8 x 15.9
v = 17.65 m/s
Resultant velocity
V(R)² = 17.65² + 4.98²
V(R) = 18.34 m/s
Answer:
B)
Explanation:
The answer is B)- The object's speed must be changing.
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<em>Water pipes burst because the water inside them expands is it gets close to freezing, and this causes an increase in pressure inside the pipe. When the pressure gets too high for the pipe to contain, it ruptures.</em>