An object has a mass of 15 kg and is accelerating to the right at 16.3 m/s2. the free-body diagram shows the horizontal forces acting on the object. what is the frictional force, ff, acting on the object? a. 5.5 n b. 15 n c. 244.5 n d. 494.5 n

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.