Astudent solving a physics problem for the range of a projectile has obtained the expression r= v20sin(2θ)g where v0=37.2meter/second, θ=14.1∘, and g=9.80meter/second2. use your calculator to evaluate r.

The softest and hardest minerals are: softest hardest

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?

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.