Physics Heat & Thermodynamics Level: High School
The potential at a certain distance from a point charge is 600 Volts , and the electric field strength is 200 N/C (Newton per Coloumb)What is the distance to the point charge ?
What is the magnitude of the charge ?
Physics Electrostatics Level: High School
Each of the two small spheres is positively charged , the combined charge totaling 4 10 – 8 C . What is the charge on each sphere if they are repelled with a force of 2.7 10 - 5 When placed 0.1 metres apart ?
Physics Heat & Thermodynamics Level: High School
An ideal gas for which g = 1.50 is used as the working substances in a cylinder undergoing a Carnot cycle between temperatures TH = 240 degreeC and TC = 50 degreeC . At TH it is expanded from a pressure of 10 atm and a volume of 10-3 m3 to a pressure of 4 atm and a volume of 2.5 . 10-3 m3 .Between what limits of pressure and volume does it operate at TC ?
Calculate the heat taken from the source and the heat rejected by the sink in each cycle , and the efficiency , assuming perfect reversibility .
Physics Heat & Thermodynamics Level: High School
A refrigerator operates in a cyclic and reversible manner between 0 and 27 degreeC . How much work must be done in freezing 1L of water ? Calculate the coefficient of performance given that the talent heat of fusion of water is 334.72 J per g .
Physics Heat & Thermodynamics Level: High School
Latent heat of fusion of water 334000 J/kg
Year’s ago , a block of ice with a mass of about 21 kg was used daily in a home icebox , The temperature of the ice was 0.0 degree C , when delivered . As it melted how much heat did a block of ice that size absorb ? Answer in units of J .Physics Properties Of Matter Level: High School
Solids
A steel railroad track has a length of 33 m when the temperature is 0 degreeC .What is the increase in the length of the rail on a hot day when the temperature is 37 degree C ? The linear expansion coefficient of steel is 11 x 10^-6 (degree C)^-1 . Answer in units of m .
Physics Properties Of Matter Level: High School
Solids
A bridge is made with segments of concrete 94 m long (at the original temperature ) . If the linear expansion coefficient is 1.2 x 10^-5 (degree C)^-1 . how much spacing is needed to allow for expansion for an increase in temperature of 49 degreeF ? Answer in units of cm .
Physics Properties Of Matter Level: High School
Solids
A building made with a steel structure is 641 m high on a winter day when the temperature is 0degree F . How much taller is the building when the temperature is T = 99 degree F ? (The linear expansion coefficient of steel is infinite = 1.1 x 10^-5 (degreeC) -1 Answer in units of cm .
Physics Properties Of Matter Level: High School
Solid
An empty rubber balloon has a mass of 0.0161 kg . The balloon is filled with helium at a density of 0.183 kg/m^3 . At this density the balloon has a radius of 0.527 m .The acceleration of gravity is 9.8 m/s^2. and the density of air is 1.29 kg/m^3. If the filled balloon is fastened to a vertical line, What is the tension in the line ? Answer in units of N .
Physics Properties Of Matter Level: High School
A Styrofoam slab has a thickness of 13.4 cm and a density of 304 kg/m^3 . What is the area of the slab if it floats just awash (top of slab is even with the water surface) in fresh water when a 79 kg swimmer is aboard ? The density of water is 1000 kg/m^3 . Answer in units of m^2
Physics Properties Of Matter Level: High School
A Ping-Pong ball has a diameter of 4.6 cm and average density of 0.0647 g/cm^3 . What force would be required to hold it completely submerged under water ? Answer in units of N
Physics Properties Of Matter Level: High School
A small metal sphere weighs 0.345 N in air and has a volume of 13.4 cm^3 .The acceleration of gravity is 9.8 m/s^2 . What is the acceleration of the sphere as it falls through water ? Answer in units of m/s^2 .
Physics Properties Of Matter Level: High School
A cork is held at the bottom of a bucket of water by a piece of string . The actual depth of the cork is 0.813537 in below the surface of the water . If the density of the cork id 202 kg/m^3 and the volume of the cork is 3 cm^3 , then what is the tension in the string ? g = 9.8 m/s^2 . Assume the density of water is 1000 kg/m^3 .1. 0.0117306 N
2. 0.0234612 N
3. 2.34612 N
4. 0.234612 N
Physics Properties Of Matter Level: High School
Archimedes Principle
A floating ball normally weighs 6N . The acceleration of gravity is 9.8 m/s^2 .What is the size of the buoyant force that acts on it ?
( When body floats , weight = bnoyant force )
Physics Properties Of Matter Level: High School
Archimedes Principle
If it is submerged in a liquid with a density exactly 2 times that of water , what will be its new apparent weight ? Answer in units of N .New apparent weight = 140 - 54.49 = 85.51 N