1)A piece of ice with a mass of 60 g is transferred directly from the freezer at a temperature of –7°C to a polystyrene cup containing 200 g of water at 75°C. Calculate the final temperature of the water. Ignore any heat lost to the cup and its surroundings
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
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1)A piece of ice with a mass of 60 g is transferred directly from the freezer at a temperature
of –7°C to a polystyrene cup containing 200 g of water at 75°C. Calculate the final
temperature of the water. Ignore any heat lost to the cup and its surroundings
2)A passenger train has six identical cars with a mass of 1500 kg each. They are accelerating at
0.80 m/s2
[forward]. Calculate the tension in the coupling between car 4 and car 5.
3)A boy in a wagon starts from a rest position and then goes down a straight ramp, gaining
speed with uniform acceleration as he travels. In 6.00 s, he is travelling at 4.2 m/s
a)What is his velocity at 10.0 s?
b)How long will it take him to reach a speed of 28.0 m/s?
4)A golfer can drive a ball with a velocity of 80.0 m/s [10º from the horizontal]. Assume no air resistance.
a) How long is the ball airborne before it hits the ground?
b) How far will the ball travel horizontally before it hits the ground?
5)A hockey puck of mass 0.170 kg is sliding along the ice with negligible friction. It then
hits a rough patch that exerts a frictional force of 0.340 N [S].
Determine the puck’s acceleration as it slides on the rough section of ice.
6)A child’s wagon with rubber tires is being pulled along a street. The wagon and its load have
a combined mass of 28.0 kg. The coefficient of friction for rubber on dry asphalt is 1.07.
a) Find the
b) How large must the pulling force be in order to get the wagon to accelerate at 0.50 m/s2
[forward]?
c) Assuming that the wagon starts from a rest position, find its velocity after 22.0 s.
7) . A child with a mass of 43.0 kg is swinging on a swing 2.60 m above the ground at
maximum amplitude.
a) Find the child’s potential energy at 2.60 m
b) How fast is the child moving when she is 1.25 m above the ground?
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