In the context of energy transfers with hot and cold reservoirs, the sign convention is that _______________.
1 answer:
Answer:
B. QC > 0; QH < 0
Explanation:
Given that there are two reservoir of energy.
Sign convention for heat and work :
1.If the heat is adding to the system then it is taken as positive and if heat is going out from the system then it is taken as negative.
2. If the work is done on the system then it is taken as negative and if the work is done by the system then it is taken as positive.
From hot reservoir heat is going out that is why it is taken as negative
From cold reservoir heat is coming inside the reservoir that is why it is taken as positive
That is why the answer will be
,
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Answer:
(a). The magnitude and direction of the velocity of the otters after collision is 1.35 m/s toward left.
(b). The mechanical energy dissipates during this play is 226.98 J.
Explanation:
Given that,
Mass of one otter = 8.50 kg
Speed = 6.00 m/s
Mass of other = 5.75 kg
Speed = 5.50 m/s
(a). We need to calculate the magnitude and direction of the velocity of these free-spirited otters right after they collide
Using conservation of momentum
Put the value into the formula
Negative sign shows the direction of motion of the object after collision is toward left.
(b). We need to calculate the initial kinetic energy
Using formula of kinetic energy
Put the value into the formula
We need to calculate the final kinetic energy
Using formula of kinetic energy
Put the value into the formula
We need to calculate the mechanical energy dissipates during this play
Using formula of loss of mechanical energy
Put the value into the formula
Negative sign shows the loss of mechanical energy
Hence, (a). The magnitude and direction of the velocity of the otters after collision is 1.35 m/s toward left.
(b). The mechanical energy dissipates during this play is 226.98 J.
This question is in complete.The question is
A coin with a diameter 3.00 cm rolls up a 30.0° inclined plane. The coin starts out with an initial angular speed of 60.0 rad/s and rolls in a straight line without slipping. If the moment of inertia of the coin is(1/2) MR² , how far will the coin roll up the inclined plane (length along the ramp)? Hint: Conservation of mechanical energy.
Answer:
distance=0.124 m
Explanation: