An 80.0-kg object is falling and experiences a drag force due to air resistance. The magnitude of this drag force depends on its
1 answer:
Answer:
Terminal velocity of object = 12.58 m/s
Explanation:
We know that the terminal velocity is attained when drag force and gravitational force are of the same magnitude.
Gravitational force = mg = 80 * 9.8 = 784 N
Drag force =
Equating both, we have
So v = 12.58 m/s or v = -15.58 m/s ( not possible)
So terminal velocity of object = 12.58 m/s
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Answer:
the mass of steam at 100°C must be mixed is 150 g
Explanation:
given information:
ice's mass, = 490 g = 0.49 kg
steam temperature, T = 100°C
liquid water temperature, T = 89.0°C
specific heat of water, = 4186 J/kg.K = 4.186 kJ/kg.K
latent heat of fusion, = 333 kJ/kg
latent heat of vaporization, = 2256 kJ/kg
first, we calculate the heat of melted ice to water
Q₁ =
where
Q = heat
= mass of the ice
= latent heat of fusion
thus,
Q₁ =
= 0.49 x 333
= 163.17 kJ
then, the heat needed to increase the temperature of water to 89.0°C
Q₂ =
(89 - 0), the temperature of ice is 0°C
= specific heat of water
so,
Q₂ =
(89 - 0)
= 0.49 x 4.186 x 89
= 182.55 kJ
so, the heat absorbed by the ice is
Q = Q₁ + Q₂
= 163.17 + 182.55
= 345.72 kJ
the temperature of the steam is 100°C, so the mass of the steam is
Q = +
(100 - 89)
Q = (
+
(11))
= Q/ [
+
(11)]
= 345.72/ [2256 + (4.186 x 11)]
= 0.15 kg
= 150 g