If their volumes are equal, then the denser one has more mass.
Answer:
Rusting of irons
Change in molecular composition
irreversible change
Explanation:
chemical change Is an irreversible change so we will only observe permanent change
Answer:
(c) 8240 kN
Resultant hydrostatic force F = 8240 kN
Explanation:
Force can be expressed as;
F = ma
F = mg ......1
Where,
F = force
m = mass
a = acceleration
g = acceleration due to gravity
And we know that mass of an object is the product of
Density and Volume
m = pV
And volume V = area × height = Ah
m = pAh .....2
Substituting m into equation 1
F = pAhg = pghA ......3
Given;
Density of water p = 1000kg/m^3
g = 9.81m/s^2
Area A = 20m × 12m = 240m^2
h = depth/2 = 7/2 = 3.5m
Substituting the values into equation 3, we have;
F = 1000×9.81×3.5×240
F = 8240400 N
Resultant hydrostatic force F = 8240 kN
Answer:
a)
Explanation:
a) Let consider that disk accelerates and decelerates at constant rate. The expression for angular acceleration and deceleration are, respectively:
Acceleration
Deceleration
Since angular acceleration and deceleration have same magnitude but opposite sign. Let is find the maximum allowed angular speed from maximum allowed centripetal acceleration:
Maximum magnitude of acceleration/deceleration is:
The least time require for rotation is:
The incline is frictionless, this means we can use the conservation of energy: the initial kinetic energy of the block
is converted into gravitational potential energy
where h is the height reached by the block as it stops. By equalizing the two formulas, we get
However, this is the maximum height reached by the block. The distance along the surface of the plane is given by: