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How much heat is needed to change the temperature of a 2.0 kg of block of copper from
10°C to 140°C? (5 points)
2. How much steam at 1000C must be added to 163g of water at 25°C contained in a 30 g
glass vessel to produce water at 770C? (10 points)
3. The density of gold at 20°C is 19,300kg/m3. Find the density at 100°C. (10 points)
Q 4. A 0.5 kg of aluminum cube at 27 ℃ and a 1.0 kg of copper cube at 100 ℃ are placed
in 2 kg of water at 22 ℃. Assuming no heat loss to the surroundings, calculate the final
temperature of the mixture.
Specific heat capacities: water 𝑐𝑊 = 4187 𝐽𝑘𝑔−1𝐾
−1
, copper 𝑐𝑐𝑢 = 386 𝐽𝑘𝑔−1𝐾
−1
,
aluminum 𝑐𝑎𝑙 = 900 𝐽𝑘𝑔−1𝐾
−1
Q 5. A 5 kg of ice cube at −10℃ is mixed with 0.1 kg of water at 80 ℃. There is no heat
loss to the surrounding. The specific heat capacity of ice is 2.22 𝑘𝐽𝐾
−1𝑘𝑔−1
,The specific
heat capacity of water is 4.187 𝑘𝐽𝐾
−1𝑘𝑔−1
. The specific latent heat of fusion of ice is
333 𝑘𝐽 𝑘𝑔−1
.
(a) What is the final physical state of the mixture? (Gas, Liquid or Solid?)
Justify your answer using suitable calculations
(b) What is the final temperature of the mixture?
A mercury-glass thermometer consists of a glass bulb filled with mercury and a
narrow glass tube attached to the glass bulb. At 0℃, the bulb is completely filled with the
mercury and its radius is 5 mm. As the temperature increases the mercury column rise
through the narrow glass tube whose diameter is 0.3 mm.
What should be the minimum length of the glass tube so that this thermometer can be
used to measure the temperatures up to 100 ℃ ?
(Hint: ignore the thermal expansion of the glass tube)
liner expansion coefficient of glass = 3.2 × 10−6 ℃−1
volume expansion coefficient of mercury = 1.82 × 10−4 ℃−1
What is the mass of a crate with a net force of 300N and accelerate it by 0.750 m/s²
an object initially has a velocity 6m/s, travel a distance of 24m with an acceleration of -4m/s. find the final velocity of the object .
car from rest is moving at a velocity of 86 km/hr in 10 seconds. Determine the acceleration of a car.
A 3.5 kg papaya is pushed across a table. If the acceleration of the papaya is 2.2 m/s² to the left, what is the net external force exerted on the papaya?
A constant net force of 200 N is exerted to accelerate a car from rest to a velocity of 40 m/s. What is the mass of the cart?
A car is traveling at 9 m/s in a circle that has a radius of 60 m. what must be the minimum value of μ for the car to make the turn without skidding?
A car is to make a term with a radius of curvature of 60 m at a speed of 27 m/s. At what angles should the road be banked for the car to make the turn?
