A box is pressed into a spring, compressing the spring by 0.25 m. The spring constant is k = 250 —. The box is released at the bottom of a frictionless ramp and reached a height of y = 0.50 m as shown below.

Which accurately compares concave and convex lenses?

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.

70 give a real life example showing how sensory neurons work with the motor neurons