Amachine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. what input force is applied to this machine

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

What is a view of science and psychology that says the value of knowledge depends on its usefulness? a. pragmatism b. psychotherapy c. physiology