Your friend decides to toast a piece of bread but leaves it in the toaster too long the bread is black and the kitchen is full of smoke

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.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

How do we measure or think of speed in the united states?