1.objects 1 and 2 attract each other with a gravitational force of 72.0 units. IF the distance separating objects 1 and 2 is changed to one-third the original value, then the new gravitational force will be units. 2.objects 1 and 2 attract each other with a gravitational force of 36.0 units. IF the distance separating objects 1 and 2 is changed to one-third the original value, then the new gravitational force will be units.

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.