Super Invar, an alloy of iron and nickel, is a strong material with a very low coefficient of thermal expansion (0.20 x 10-6 C°). A 1.8-m-long tabletop made of this lloy is used for sensitive laser measurements where extremely high tolerances are required. ▾ Part A How much will this alloy table expand along its length if the temperature increases 7.0 C°? Express your answer to two significant figures and include the appropriate units. ΔΙ» Submit Part B How much will a 1.8-m-long table made of steel expand along its length if the temperature increases 7.0 C°? Express your answer two significant figures and include the appropriate units. Al- Request Answer Submit Request Answer

In 1986, a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 160 km long, 40.0 km wide, and 250m thick. a. What is the mass of this iceberg, in kilograms, given that the density of ice is 917 kg/m3 b.  How much heat, in joules, must be transferred to the iceberg to melt it? Assume the ice is at 0° C, and the latent heat of fusion for water is Lf=79.8 kcal/kg  c. How long, in years, would it take sunlight alone to melt ice this thick, if the ice absorbs an average of 100 W/m2, 12.00 hours per day?

A 689.00g block of gold ( cgold=129 J kg°C ) initially at 15.00°C is placed in thermal contact with an unknown mass of aluminum ( calum=900 J kg°C ) initially at 90.00°C . If they equilibrate at a final temperature of 68.00°C , what is the mass of the aluminum? g What assumption do we make when solving calorimetry problems like this? We can only have two substances in thermal contact. The substances are in a closed, isolated container that does not allow any energy to enter or leave the system.     The two substances must have different specific heats. Some of the energy transferred from one substance is lost to its surroundings and does not go to the other substance.

For a planet to have an atmosphere, gravity must be sufficient to keep the gas from escaping The escape speed a particle needs to escape the earth's gravitational attraction is 1.1 x 10 m/s. The motion of projectiles never depends on mass, so this escape speed applies equally to rockets and to molecules in the earth's upper atmosphere. Part A At what temperature does the rms speed of nitrogen molecules equal the escape speed? Express your answer in kelvins. ΜΕ ΑΣΦΑ T- Submit Part B T- Request An At what temperature does the mms speed of hydrogen molecules equal the escape speed? Express your answer in kelvins. VAZO Submit ? K K