Question 26 2 pts You do 60 Joules of work on a air in a balloon while compressing it and the balloon also absorbs 40 Joules of heat. What is the change in internal energy of the gas? A 1000 kg car going at 20 m/s is brought to a stop using its brakes. Let's assume a total of 25 kg of iron in the brakes and wheels absorbs the heat from the friction. What is the change in temperature of the brakes and wheels? Ciron = 460 Joules/kg. Celsius. O 20 Joules, 17.4 Celsius O 100 Joules, 17.0 Celsius O 100 Joules, 17.4 Celsius -100 Joules, 17.4 Celsius O -20 Joules, 17.8 Celsius Question 27 2 pts Inside a building, the temperature is 15 Celsius and the relative humidity is 30 percent. How much water vapor is in each cubic meter of air? (Saturation Density is .0128 kg/m3) What is the Carnot efficiency of a heat engine operating between the temperatures of 80 Celsius and 250 Celsius? O .00384 kg. 32.5% O .00384 kg. 38.6% O .00384 kg. 29.8% O .00427 kg. 32.5% O .00427 kg. 36.7% Question 28 2 pts The frequency of a sound wave is 300 Hz and the room temperature is 30 Celsius. What is the wavelength of this sound wave. Two children stretch a jump rope between them and send wave pulses back and forth. The rope is 4 meters long and its mass is .4 kg and the force exerted on it by the children is 50 N. What is the speed of the waves on the rope? O 1.32 m, 22.4 m/s O 1.04 m/s, 22.4 m/'s 1.16 m, 22.4 m/'s 1.16 m, 24.3 m/'s O 1.16 m, 20.8 m/'sQuestion 29 The sound level measured in a room by a person watching a movie varies from 50 dB to 100 dB during a loud part. Approximately how many times louder is the latter sound? In a student laboratory exercise, the wavelength of a 30,000 Hz wave is measured to be 1.085 cm. Find the air temperature. O 16. -7.88 Celsius 0 32, -9.63 Celsius O 10, -9.63 Celsius 32, -11.74 Celsius O 64, -9.63 Celsius