1) A mass of 60kg of water is heated by 80oC. How much energy is
required to do this? Water has a specific heat capacity of 4200 J/kg°C.
2) Aluminium has a specific heat capacity of 900 J/kg°C and water has a specific
heat capacity of 4200 J/kg°C. Based on these figures, which of the following
statements is true?
a) Water will turn to steam more easily than aluminium metal will melt.
b) 1kg of aluminium will take much longer to change its temperature than water
c) Aluminium is much more suitable for use in car radiators than water
d) 1kg of water needs to receive much more energy than 1kg of aluminium to change its temperature by 1°C
Answers: 2
Physics, 21.06.2019 17:30, Xavier2712
Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.
Answers: 1
Physics, 22.06.2019 00:40, naomicervero
The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.
Answers: 1
Physics, 22.06.2019 03:30, Bryanguzman2004
Two polarizers are oriented at 24.0∘ to one another. light polarized at a 12.0-degree angle to each polarizer passes through both. what is the transmitted intensity (%)?
Answers: 2
1) A mass of 60kg of water is heated by 80oC. How much energy is
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