Answer: 
Explanation:
The density
of a material is given by:
(1)
Where:
is the mass of the cube
is the volume of the cube
Now, the volume of a cube is equal to the length
of its edge to the power of 3:
(2)
If we know
, the volume of this cube is:
(3)
Substituting (3) in (1):
(4)
This is the density of the cube
Part a
Answer: 17.58 km/h

Total Distance =10 km
Total time =0.5689 h

Part b
Answer: 17.626 km/h

Total Distance =42.195 km
Total time =2.3939 h

Answer: D. 1
Explanation:
Choice 1 could represent a neutral atom of oxygen
Answer:
21,000 N
Explanation:
You would use the formula F=ma
So you would do substitution...
F=700 kg(30 m/s/s)
F=21,000 N
Answer:
b.
c.
e.
h.
Explanation:
If we consider the ball,the tension is not balance by weight then the force acting will be non zero.It means that train car in not inertial frame of reference.And the same time the train car must accelerated with respected to the earth.It is not moving straight path.When train is in rest position but the string will be at the constant angle.
So the following option are correct:
b.
c.
e.
h.