The answer would be 13.8889
Nearest whole=14
hope this helps:)
Answer: Open system
According to thermodynamics, if a system exchanges matter and energy with its environment it is an open system. For example, human beings and animals can be considered as open systems, since we take chemical energy in the form of food and perform work on our surrounding environment when moving and doing activities.
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Answer:
Explanation:
Given
acceleration a =2.2 m/s^2
Force F(t) is given by
F(t)=5.40 t N/s
Power supplied by this force at different time t is given by
Power
velocity at any instant t is given by
v=at
Power
Power
at t=1 s
Power =11.88 W
at t=2 s
Power
at =4 s
Power
Answer:
c. -14,000
Explanation:
Workdone by gas is the product of the pressure and the volume where there is a change of volume.
If v1 is the initial volume of the gas and v2 is the final volume of gas, the work done
= p(v2 - v1)
where p is the pressure
and p = 70,000 Pa
Given that volume decrease by 0.2m^3, v2 - v1 = -0.2
Workdone = 70000 ( -0.2)
Workdone = -14,000 J
Option c. -14,000
Answer:
i. 0.2 N ii. 30°
Explanation:
(i) Calculate the magnitude and direction of force on X, when a current of 4A is passed through it.
The magnetic force F = BILsinФ where B = magnetic field strength = 0.1 T, I = current = 4 A and L= length of conductor = 0.5 m. Since the conductor X of length 0.5m is held along the positive X-axis and situated in a uniform horizontal magnetic field of 0.1T which is pointing towards the positive Y-axis, both B and L are perpendicular to each other. So, Ф = 90°
So, F = BILsinФ
F = 0.1 T × 4 A ×0.5 m × sin90°
F = 0.1 T × 4 A ×0.5 m × 1
F = 0.2 N
(ii) Through what angle must X be turned in a vertical plane so that the force on X is halved
If F' = BILsinФ' where Ф'=the new angle, and BIL = F
F'/F = sinФ'
Since F'/F = 1/2
sinФ' = 1/2
Ф' = sin⁻¹(1/2) = 30°
