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Example:
A steel railroad track has a length of 30.000 m when the temperature is 0°C. What is its length on
a hot day when the temperature is 40.0°C? (b) Suppose the track is nailed down so that it
can’t expand. What stress results in the track due to the temperature change
A 72.5 kg
k
g
skater moving initially at 2.40 m/s
m
/
s
on rough horizontal ice comes to rest uniformly in 3.52 s
s
due to friction from the ice.
A, What force does friction exert on the skater?
Express your answer with the appropriate units. Enter positive value if the direction of the force is the same as that of the initial velocity of the skater and negative value if the direction of the force is opposite.
A 200g of gas was heated from 50°C to around 120°C. The gas expanded in a piston-cylinder apparatus from 2.0L of initial volume to find a volume of 10.0L against an external pressure of 3.0 atm. Calculate for the change in the internal energy. The specific heat of water is 2.19 J/g×°C)
Calculate the specific heat capacity of a new alloy if a 15.4g sample absorbs 393 J when it is heated from 0.0°C to 37.6°C
When gasoline burns in an automobile engine, the heat released causes the product CO2 and H2O to expand,which pushes the piston outward. if the expanding gases do 789 J of water on the piston and the system loses 245 J of heat, calculate "\\Delta U" in J
Neutron stars are some of the densest objects in the universe. They form during supernova ex plosions and are very small compared to other astronomical objects. You can assume 5 * 10 ^ 17 kg/m³ as the average density of a neutron star. The Earth has a total mass of about 5.97*10^ 24 kg
What would be the diameter of the Earth if it had the density of a neutron star?
calculate the voltage applied to a 2.00-"\\mu"F capacitor when it holds 3.10"\\mu"C of charge
find the charge stored when 5.50V is applied to an 8.00-pF capacitor
What charge is stored in a 180.0-"\\mu"F capacitor when 120.0 V is applied to it
A 12-volt battery has an internal resistance of 0.01"\\Omega". The starter motor of the car draws a current of 230 A. What is the potential difference between the terminal of the battery at this time
