The slotted arm revolves in the horizontal plane about the fixed vertical axis through point o. the 2.5-lb slider c is drawn toward o at the constant rate of 2.7 in./sec by pulling the cord s. at the instant for which r = 7.9 in., the arm has a counterclockwise angular velocity ω = 5.5 rad/sec and is slowing down at the rate of 2.4 rad/sec2. for this instant, determine the tension t in the cord and the force n exerted on the slider by the sides of the smooth radial slot. the force n is positive if side a contacts the slider, negative if side b contacts the slider.

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

Which best describes the difference between internal and thermal energy?