Physics Properties Of Matter Level: High School
Elasticity
When a 300 N man sits on a chair, each of the four chair legs experiences strain of 5.72*10^-4 , while each leg is compressed by .0552 cm . Assume that the four legs are identical and that they share the load equally , find the initial length of each leg
Physics Heat & Thermodynamics Level: High School
Helium in a toy balloon does work on its surroundings as it expands with a constant pressure of 3.42 x 10^5 Pa in excess of atmospheric pressure . The balloon’s initial volume is 2.8 x 10^-4 m^3 , and its final volume is 2.58 x 10^-3 m^3 . Find the amount of work done by the gas in the balloon .
Physics Heat & Thermodynamics Level: High School
Given: Specific heat of water = 1 cal/(g x *C) : How much heat is required to vaporize a(n) 7g ice cube initially at 0*C ? The latent heat of fusion of ice is 80 cal/g and the latent heat of vaporization of water is 540k cal/g . Answer in units of cal .
Physics Heat & Thermodynamics Level: High School
Given : Specific heat capacity = 4180 J = kg x *C and latent heat of vaporization of water = 2.26 x 10^6 J/kg . You have 99 g of steam at 100*C . How much heat must be removed to change it to 99 g of water at 21 *C .
Physics Heat & Thermodynamics Level: High School
A 69.7 kg runner expends 457 J/s of power while running a marathon . Assuming that 10% of the energy is delivered to the muscle tissue and that the excess energy is primarily removed from the body by sweating , determine the volume of bodily liquid (assume it is water) lost per hour . (At 37*C the latent heat of vaporization of water is 2.41 x 10^6 J= kg) . Answer in units of cm^3 .
Physics Heat & Thermodynamics Level: High School
You have collected exactly 2500 aluminum cans fro recycling ,each with a mass of 14.2 g . How much energy is needed to melt them if their initial temperature is 26.2*C respectively . Answer in units of J .
Physics Heat & Thermodynamics Level: High School
Conservation of Energy
A 777 kg car is moving at 27 m/s brakes to a stop . The brakes contain about 15 kg of iron that absorb the energy . What is increase in temperature of brakes ? Assume the specific heat of iron is 450 J/kg x degrees C . Answer in units of degrees C .
Physics Heat & Thermodynamics Level: High School
A 99.4 kg weight-watcher wishes to climb a mountain to work off the equivalent of a large piece of chocolate cake rated at 698 (food) Calories . (1 food Calorie = 10^3 calories) . The acceleration of gravity is 9.8 m/s^2 . How high must the person climb ? Answer in units of km . 23
Physics Heat & Thermodynamics Level: High School
Calorimetry
Given : Specific heat of water = 4180 J/kg x degree C . You need to raise the temperature of 59 g water from 11.5 degrees C to 78 degrees C . How much heat is needed to accomplish this ? Answer in units of J .
Physics Heat & Thermodynamics Level: High School
Calorimetry
What is the final equilibrium temperature when 17 g of milk at 19 degrees C is added to 101 g of coffee at 89 degrees C ? Assume the specific heats of milk and coffee are the same as that of water , and neglect the specific heat of the container , Answer in units of degrees C .
Physics Heat & Thermodynamics Level: High School
A helium-filled balloon has a volume of 0.5 m^3 . As it rises in the earth’s atmosphere , its volume changes , what is its new volume if its original temperature and pressure are 12degrees C and 1.6 atm and its final temperature and pressure are (-22degrees C) and 0.6 atm ? Answer in units of m^3 .
Physics Properties Of Matter Level: High School
Gases
The inside of the cylindrical can shown at “click here” above has cross sectional area 0.005 m^2 and length 0.15 m . The can is filled with an ideal gas and covered with a loose cap . The gas is heated to 363 K and some is allowed to escape from the can so that the remaining gas reaches atmospheric pressure (1.0 x 10^5 Pa ) . The cap is now lightened and the gas is cooled to 298 K .a) What is the pressure of the cooled gas ?
b) Determine the upward force exerted on the cap by the cooled gas inside the can ?
c) If the cap develops a leak , how many moles of air would enter the can as it reaches a final equilibrium at 298 K and atmospheric pressure ?(Assume that air is an ideal pressure)
Physics Heat & Thermodynamics Level: High School
First law of Thermodynamics
An ideal gas is compressed from 20 liters to 2.0 liters at a constant pressure of 3.0 atm by rawing from it so that the temperature drops . At that point , its volume is held constant and heat is added to it so that the pressure rises and its returns to the original temperature . Draw a P.V diagram . Compute the network done on or by the gas determine the net heat flow .
Physics Heat & Thermodynamics Level: High School
A 5.0 kg piece of aluminum at 350 degrees C is dropped on to 3 kg of ice . All the ice melts . What is the final temperature of the water ?
Physics Heat & Thermodynamics Level: High School
Calorimetry
Two grams of liquid water are at 0 degree C , and another five grams are at 100 degrees C . Heat is removed from the water at 0 degree C , completely freezing it at 0 degree C . This heat is then used to vaporize some of the water at 100 degrees C . What is the mass (in grams) of the liquid water that remains ?