5. you are skateboarding on top of a small hill and take a break. you have 100 j of potential energy. if
your mass is 80 kg, how high is the hill you are skating on? (4 pts)

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

If 2 moles of co_2 at 2l and 500k are expanded reversibly to 20l, more work can be obtained from an adiabatic process than from an isothermal process. is the above statement true or false?

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.