Auniform rod is 2 m long. the rod is pivoted about a horizontal, frictionless pin through one end. the rod is released from rest at an angle of 30 degrees above the horizontal.
what is the angular acceleration of the rod at the instant it is released?
the rotational inertia of the rod, in this case, can be calculated using inerita= 1/3 m l^2 where m is the mass of the rod and l is the length of the rod.

a. 4.7 rad/s^2
b. 6.9 rad/s^2
c. 6.4 rad/s^2
d. 5.6 rad/s^2
e. 4.2 rad/s^2

You carry a 7.0-kg bag of groceries 1.2 m above the ground at constant speed across a 2.7m room. how much work do you do on the bag in the process? (a) 157j (b) 0.00j (c) 185j (d) 82j

Asteam power plant operates on an ideal reheat rankine cycle between the pressure limits of 15 mpa and 10 kpa. the mass flow rate of steam through the cycle is 12 kg/s. steam enters both stages of the turbine at 500°c. if the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 10 percent, determine (a) the pressure at which reheating takes place, (b) the total rate of heat input in the boiler, and (c) the thermal efficiency of the cycle. also, show the cycle on a t-s diagram with respect to the saturation lines. (2.15 mpa; 45.0 mw; 42.6%)

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.