Suppose the ends of a 27-m-long steel beam are rigidly clamped at 0°c to prevent expansion. the rail has a cross-sectional area of 35 cm^2. what force does the beam exert when it is heated to 39°c? (αsteel = 1.1 × 10^−5/c°, ysteel = 2.0 × 10^11 n/m^2).

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)

Aball is thrown vertically upwards from the top of a tower with a speed of 100m/s. it strikes the pound near the base of the tower after 25sec . the height of the tower is