The efficency of a practical machine is less than 100% why?

the atomic number is consider a unique atom and element identifier. Describe the associated subatomic particle, and how it can be used to identify the atom.

How does the law of conservation of energy apply to the transformation of various forms of energy? Explain with examples.

The class of anthropogenic compounds responsible for the breakdown of stratospheric ozone are known as

What is the mass if an object moving with a speed of 9m/s and a kinetic energy if 2000 J

Which classification of property does not affect density?

What is a pulsar? a. the remains of a low-mass star after it explodes b. a spinning neutron star emitted radio waves c. another name for a protostar d. the stage before a dying star becomes a supernova

Can we divide two vectors?

Discuss the relationship between amperage, voltage, and power.

A ray of yellow sodium light enters water from air with an angle of incidence of 45°. What is the angle of refraction?

As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is