Answer:
V(c)' = 0.325 m/s
V(a)' = 2.19375 m/s
V(b)'' = 0.73125
Explanation:
See attachment for explanation.
Preocupada com o aumento da tarifa na conta de luz, uma pessoa resolve economizar diminuindo o tempo de banho de 20 para 15 minu
1 answer:
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Answer:
ΔQ = - 762 J (Negative Sign shows heat transfer from the system)
Explanation:
The heat transferred to or from the system can be given by using First law of Thermodynamics as follows:
where,
ΔQ = Heat Transferred to or from system = ?
ΔU = Change in Internal Energy of System = Change in Thermal Energy
ΔU = - 240 J (negative sign due to decrease in energy)
W = Work done on system = -522 J (negative sign due to work done "on" system)
Therefore,
<u>ΔQ = - 762 J (Negative Sign shows heat transfer from the system)</u>
Answer:
Question 1)
a) The speed of the drums is increased from 2 ft/s to 4 ft/s in 4 s. From the below kinematic equations the acceleration of the drums can be determined.
This is the linear acceleration of the drums. Since the tape does not slip on the drums, by the rule of rolling without slipping,
where α is the angular acceleration.
In order to continue this question, the radius of the drums should be given.
Let us denote the radius of the drums as R, the angular acceleration of drum B is
α = 0.5/R.
b) The distance travelled by the drums can be found by the following kinematics formula:
One revolution is equal to the circumference of the drum. So, total number of revolutions is
Question 2)
a) In a rocket propulsion question, the acceleration of the rocket can be found by the following formula:
b)