A rod of length 2.8 m is hinged at one end, and a force of magnitude
F = 14 N
is applied at the other (see figure below).

(a) If the magnitude of the torque associated with this force is
31 N · m,
what is the angle ϕ ?
°

(b) What is the sign of the torque?
negative
positive

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system