Answer:
Because the rope is stopping the force of gravity from acceleration it.
PLZ MARK BRAINLIEST :-)
Answer:
Radio waves and microwaves is the answer.
Explanation:
any wave having low frequency or high wavelength will have low energy.
Six.
If you want to double the force, you need to double either v or B. Changing the angle does not give totally predictable results. The formula is
F = q*v*B Sin(theta) altering theta isn't linear. Doubling B is. The answer is A
Seven
Seven is correct. The poles on a magnet is where the field is the strongest.
Eight
I can't really answer this question. Much depends on where you are and whether or not the readings are true or erratic. It is taking only one parameter into account where in reality there are many. My guess would be that as you move up the longitude the angle increases. So the answer would be near but not at the north pole. Seek out your notes for confirmation.
Answer:
a) V=203 ft/s
b) Since the Mach number is 0.063 < 0.3, we can conclude that the flow
is incompressible!
Explanation:
solution:
Start by deriving the expression for the fluid velocity, from the Bernoulli equation:
Next, we need to express the pressure difference between the stagnation pressure and the static pressure. This can be done using the relation between the pressures and the specific weights:
Since and it is much greater than we can obtain from the previous equation:
-p_static=h
V=√2*h/r_fluid
Using the ideal gas formula we can obtain the neccesarry density of Helium:
r_fluid=p/R.T
=5.80*10^-4 sl/ft^3
Using the value for water specific weight from the table B.1, we return to the expression for fluid velocity:
V=√2*h/r_fluid
V=203 ft/s
Next, we need to obtain the Mach number for the fluid flow velocity, so that we can find out if the flow is in compressible or not. The Mach number formula is:
M=V/c
=V/√kRT
Substituting the known values for the real gas constant R, the given temperature T and the adiabatic index k, we obtain:
M=V/c
=0.063
Since the Mach number is 0.063 < 0.3, we can conclude that the flow is incompressible!
Answer:
a) The velocity of rock at 1 second, v = 9.8 m/s
b) The velocity of rock at 3 second, v = 29.4 m/s
c) The velocity of rock at 5.5 second, v = 53.9 m/s
Explanation:
Given data,
The rock is dropped from a bridge.
The initial velocity of the rock, u = 0
a) The velocity of rock at 1 second,
Using the first equation of motion
v = u + gt
v = 0 + 9.8 x 1
v = 9.8 m/s
b) The velocity of rock at 3 second,
v = u + gt
v = 0 + 9.8 x 3
v = 29.4 m/s
c) The velocity of rock at 5.5 second,
v = u + gt
v = 0 + 9.8 x 5.5
v = 53.9 m/s