According to my observations, it takes 27.32 days.
Answer:
Explanation:
Work done is defined as the product of force and the displacement in the direction of force.
W = F x d x Cos θ
Where, θ be the angle between force and the displacement.
The force of gravity acts downwards and the displacement is in upward, so the angle is 180. cos 180 = -1 , so the work done by the force of gravity is negative.
The force of rope acting in upwards direction and displacement also in upwards direction.
So, the work done is positive
Answer:
581 kJ, work was done by the system
Explanation:
According to the first law of thermodynamics:
where
is the change in internal energy of the system
Q is the heat absorbed by the system (positive if absorbed, negative if released)
W is the work done by the system (positive if done by the system, negative if done by the surrounding)
In this problem,
Therefore the work done by the system is
And the positive sign means the work is done BY the system.
Answer:
volume of water is 0.1092 m3
Explanation:
We know that heat energy required to convert water into ice is given as
Q =mL
where L is Latent heat of fusion of ice is 336000 Jkg-1
=1000*V
Q = 1000V*336*10^3
Q = 336*10^6 V
ENERGY used by the freezer is given as
= 6.0*1.7*10^3 W = 10,200 w
energy provided per hour is Q = 10,200 W *1*60*60 s = 3.67*10^7 J
THEREFORE we have V
336*10^6 V = 3.67*10^7 j
v = .109 m3
volume of water is 0.1092 m3
Answer:
11.82 N upward and parallel to the incline.
Explanation:
Let g = 9.81 m/s2. Gravity that acts on the bin has a magnitude of
W = mg = 3*9.81 = 29.43 N
The gravity component that is parallel to the 40 degree incline is
If the bin is moving at constant speed, then the net force (parallel to the incline) is also 0. Gravity is balanced with the push force of 26 N and the friction force.
The magnitude of friction force is 26 - 18.9 = 7.08 N
The the bin is moving down the incline, then gravity is 18.9N , friction is 7.08 N, one must create an upward force of 18.9 - 7.08 = 11.82 N parallel with the incline to balance this.