What is the main purpose of a simple machine?

A quantity of gasoline injected into car engine has a potential energy of 100J. All of this energy is not converted into useable work because

How could the toaster serve as an example of Conduction energy transfer?

Iron's ability to rust is not a physical property because A. it cannot be observed. B. the identity of iron stays the same. C. a new substance with new properties is formed. D. iron is magnetic

Consider two diffraction gratings with the same slit separation. The only difference between the two gratings is that one grating has 5 slits and the other 10 slits. Both gratings are illuminated with a beam of the same monochromatic light.

What build proteins for cell function in a animal cell

Technician A says that engine parts should be be cleaned before a thorough test can be done to detect cracks. Technician B says that pressure testing can be used to find cracks in blocks or cylinder heads. Who is right?

How are mathematics and science related?

Radio telescopes detect waves with a wavelength of roughly 10 m. True False

2. A 0.30 kg ball is dropped onto a concrete driveway. The ball's velocity before impact is 4.5 m/s and after impact is 4.2 m/s. What is the change in the ball's momentum?

If we start with 400 atoms of a radioactive substance, how many would remain after one half-life? After 2 half-lives? After 3 half-lives? After 4 half-lives?