There is no change in the weight of either
Air has no influence on the weight of an object unless the object is accelerating down through an air column. The air resistance to the free fall of the object may have an influence on its instantaneous weight of the object.
Explanation:
The weight of an object is influenced by the mass of the object and gravity. Gravity also has influence in a vacuum. Therefore the wooden and iron piece will weight the same in a vacuum as in the air.
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As per bernoulli's principle
![P_1 + \frac{1}{2}\rho v_1^2 = P_2 + \frac{1}{2}\rho v_2^2](https://tex.z-dn.net/?f=P_1%20%2B%20%5Cfrac%7B1%7D%7B2%7D%5Crho%20v_1%5E2%20%3D%20P_2%20%2B%20%5Cfrac%7B1%7D%7B2%7D%5Crho%20v_2%5E2)
here
= pressure upwards
= pressure downwards
= velocity of air upwards
= velocity of air downwards
now from this equation we can say that the pressure difference will be
![P_1 - P_2 = \frac{1}{2}\rho v_2^2 - \frac{1}{2}\rho v_1^2](https://tex.z-dn.net/?f=P_1%20-%20P_2%20%3D%20%5Cfrac%7B1%7D%7B2%7D%5Crho%20v_2%5E2%20-%20%5Cfrac%7B1%7D%7B2%7D%5Crho%20v_1%5E2)
now the force due to this pressure difference will be
![F = (P_1 - P_2)A](https://tex.z-dn.net/?f=F%20%3D%20%28P_1%20-%20P_2%29A)
so this is the above force which is given above
Answer:
Answer:
a 100W light bulb costs one tenth of a kilowatt when used for one hour
so 6 hours = 6/10 of a kilowatt
= 6/10 of 6 = 3.6 Dinars
<u>We are given:</u>
Mass of load = 140 kg
Acceleration = 0.4 m/s² downward (from Q24)
<u>24. Finding the tension in the cable:</u>
Ma = Mg - T
where 'a' is the acceleration of the load and T is the tension in the cable
replacing the variables, we get:
(140)(0.4) = (140)(9.8) - T
T = (140)(9.8) - (140)(0.4)
T = 1372 - 56
T = 1316N
<u>25. Finding the distance covered when the load accelerates for 20 s:</u>
in this case, the load will start from rest
so, initial velocity = 0 m/s
acceleration = 0.4 m/s²
from the second equation of motion:
s = ut + (1/2)at²
where s is the distance covered, u is the initial velocity and t is the time taken
s = (0)(20) + (1/2)(0.4)(20)²
s = 0 + 0.2*(400)
s = 80 m
here we didn't take the acceleration due to gravity of the mass into consideration because it is connected to the crane, which would act against any forces and since we are given that the total acceleration is 0.4 m/s², we will just assume that it's the final acceleration of the mass
Answer:
D.velocity
Explanation:
When unbalanced forces are applied to a moving bike along the direction its moving, the velocity of the bike changes.
Unbalanced forces causes a body to accelerate. Acceleration is the rate of change of velocity with time.
When unbalanced forces acts on a body, the velocity changes.
- An unbalanced force is a force whose resultant is not zero.
- Such a force causes a body to change motion and then acceleration.
- For a body to accelerate, the velocity must change per unit of time.