17. A system of weight 7 Kg is heated from its initial temperature of 10ºC to its final temperature of 30°C. Find out the total heat obtained by the system. Note that the specific heat of the system is 0.45 kJ per Kg K.

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Please answer number 17
13. Freddy who weights 20kg, sits on one side of the seesaw which is 3.5m away from the center. His father sits
on the other side and balances the seesaw. If his Father weights 70kg, how far away from the center is he
sitting?
14. A Steel wire 3 ft long and a copper wire 2 ft long each 0.20in? in cross section, are fastened together end to end
and are then subjected to a Tension of 200lbs. Calculate the elongation of each wire if the young's modulus of steel
is 29x10 and 19x10 for copper. (*
15. What is the absolute pressure at the bottom of a 10m water tank?
16. A 20kg block of Aluminum (p=2700kg/m is about to be pulled out from the bottom of the sea. What is the
tension in the hoisting cable when the block is still at rest? (
17. A system of weight 7 Kg is heated from its initial temperature of 10°C to its final temperature of 30°C. Find
out the total heat obtained by the system. Note that the specific heat of the system is 0.45 kJ per Kg K.
18. The color orange within the visible light spectrum has a wavelength of about 620 nanometers or 620 x10
meters and the speed of light waves is a constant value of 3.0x10®m/s. What is the frequency of orange light?
Transcribed Image Text:13. Freddy who weights 20kg, sits on one side of the seesaw which is 3.5m away from the center. His father sits on the other side and balances the seesaw. If his Father weights 70kg, how far away from the center is he sitting? 14. A Steel wire 3 ft long and a copper wire 2 ft long each 0.20in? in cross section, are fastened together end to end and are then subjected to a Tension of 200lbs. Calculate the elongation of each wire if the young's modulus of steel is 29x10 and 19x10 for copper. (* 15. What is the absolute pressure at the bottom of a 10m water tank? 16. A 20kg block of Aluminum (p=2700kg/m is about to be pulled out from the bottom of the sea. What is the tension in the hoisting cable when the block is still at rest? ( 17. A system of weight 7 Kg is heated from its initial temperature of 10°C to its final temperature of 30°C. Find out the total heat obtained by the system. Note that the specific heat of the system is 0.45 kJ per Kg K. 18. The color orange within the visible light spectrum has a wavelength of about 620 nanometers or 620 x10 meters and the speed of light waves is a constant value of 3.0x10®m/s. What is the frequency of orange light?
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