Physics Heat & Thermodynamics Level: High School
Calorimetry
A 0.215 kg piece of aluminum that has a temperature of -155 degrees C is added to 1.5 kg of water that has a temperature of 3.0 degrees C . At equilibrium the temperature is 0.0 degree C . Ignoring the container and assuming that the heat exchanged with the surroundings is negligible , determine the mass of water that has been frozen into ice .
Physics Heat & Thermodynamics Level: High School
A woman finds the front windshield of her car covered with ice at -12.4 degree C . The ice has a thickness of 4.35 x 10^-4 , and the windshield has an area of 1.25 m^2 . The density of ice is 917 kg/m^3 . How much heat is required to melt the ice ?
Physics Heat & Thermodynamics Level: High School
The latent heat of vaporization of H2O at body temperature (37 degreeC ) is 2.42 x 10^6 J/kg . To cool the body of a 72 kg jogger (average specific heat capacity = 3500 J/(kg . degree C) by 1.2 degree C , how many kilograms of water in the form of sweat have to be evaporated ?
Physics Heat & Thermodynamics Level: High School
Calorimetry
At a fabrication plant , hot metal forging has a mass of 79 kg and a specific heat capacity of 430 J/(kg.degrees C) . To harden it , the forging is immersed in 710 kg of oil that has a temperature of the oil and forging at thermal equilibrium is 46 degree C . Assuming that the heat flows only between the forging and the oil , determine the initial temperature of the forging .
Physics Heat & Thermodynamics Level: High School
Calorimetry
2 objects are added to a container holding 200 g of 20 deg C ethanol . The hot object has a mass of 100 g and is removed from a pot of 212 deg F water , its specific heat being 1/5 that of water . The other object is taken from a 263 K freezer , its mass is 75 g and its specific heat 30% that of water . What will be the final equilibrium temperature of the mixture ?
Physics Heat & Thermodynamics Level: High School
Surface area of a city is 45 square miles with a snow density of 15% that of water . Average depth of snow is 13 inches . What is the volume in cubic meters of snow covering the city ? How much energy in both joules and kcal would be needed to turn this snow (32 deg F ) into water ? Assume 9 hours of sunlight and average sunlight intensity is 400 W/meter squared . Also assume that 50% of this energy is absorbed by the snow . How many hours of sunlight is needed to melt the snow ?
Physics Heat & Thermodynamics Level: High School
Radiation
2 Well insulated wall temperature of room A is 20 deg Celcius , and poorly insulated wall temperature of room B is 12 deg Celcius . Body surface temperature is 29 degree Celcius with a surface area of 1.8 meters squared and emissivity of 0.9 . What is the man’s radiant loss in each house ?
Physics Waves And Oscillations Level: High School
Which one of these instruments produces the highest pitch sounda) piccolo
b) flute
c) tuba
Physics Waves And Oscillations Level: High School
A wave has a wavelength of ½ meter and a frequency of 680 hz . what is the velocity of this wavea) 320 m/s
b) 340 m/s
c) 680 m/s
Physics Waves And Oscillations Level: High School
What is the primary difference between x-rays and visible lights ?a) one is wave and the other is a photon
b) x-rays are not electromagnetic waves
c) light is not an electromagnetic wave
d) they have different frequencies
Physics Current Electricity Level: High School
A household circuit rated at 120 Volts is protected by a fuse rated at 15 amps . What is the maximum number of light bulbs which can be lit simultaneously in parallel in this circuit without blowinga) 4
b) 18
c) 20
d) 24
Physics Waves And Oscillations Level: High School
Which oscillates more time in a minute ?a)100 hz
b)300 hz
c) depends up on the size of the object
Physics Waves And Oscillations Level: High School
You hear a musician playing a series of notes of increasing frequency . As the frequency increases , the wave speed .a) decrease
b) stays the same
Physics Waves And Oscillations Level: High School
What type of wave is sound ?a) transverse
b) compression
c) amplitude
Physics Waves And Oscillations Level: High School
Which of these list is in order of increasing wavelength ?a) first harmonic, second harmonic , third harmonic
b) second harmonic, third harmonic , fourth harmonic
c) third harmonic , second harmonic , first harmonic