Answer:
8977.7 kg/m^3
Explanation:
Volume of water displaced = 55 cm^3 = 55 x 10^-6 m^3
Reading of balance when block is immersed in water = 4.3 N
According to the Archimedes principle, when a body is immersed n a liquid partly or wholly, then there is a loss in the weight of body which is called upthrust or buoyant force. this buoyant force is equal to the weight of liquid displaced by the body.
Buoyant force = weight of the water displaced by the block
Buoyant force = Volume of water displaced x density of water x g
= 55 x 10^-6 x 1000 x .8 = 0.539 N
True weight of the body = Weight of body in water + buoyant force
m g = 4.3 + 0.539 = 4.839
m = 0.4937 kg
Density of block = mass of block / volume of block
=
Density of block = 8977.7 kg/m^3
Answer:
h = 6.39 m
Explanation:
radius = 6/2 =3in= 3/12 in/ft = 0.25 ft
apply continuity equation to evaluate the velocity
flow rate = area * velocity
2.2 = π(0.25^2) * V
⇒ V = 11.2 ft/s
*assuming there is no applied pressure difference along the pipe
applying Energy conservation law
initial potential energy = final kinetic energy
pgh = (1/2)*pv^2
where p = density
v = velocity
plugging in the values:
p cancels out on both the sides
⇒ 9.81 * h = (11.2^2)/2
h = 6.39 m
Answer: the rarest element is Francium. J is not on the periodic table. also Dmitri Mendeleev proposed the periodic table.
Explanation: Kinda looked the last one up.
Answer:
0.016 s
Explanation:
Initial velocity, u = 0
use the third equation of motion to find the acceleration of the rock.
Net displacement in the vertical direction would be zero. y = 0
Use second equation:
Thus, the rock will return to its initial release point in 0.016 s.
Muscular strength is a measure of how much force you can exert in one repetition. Muscular endurance refers to the ability to perform a specific muscular action for a prolonged period of time.