Answer:
C - wasted output energy = useful output energy
Explanation:
Useful output + wasted output ALWAYS equals input energy. If the device is 50% efficient, that means that 50% of the input energy is converted into useful output energy, and 50% is converted to wasted output energy. The wasted output energy is equal to the useful output energy.
<span>Solution
Formula
total velocity, V =mass 1 Ă— velocity 1 + mass 2 Ă— velocity 2 â• mass 1 + mass 2
Given
mass 1 = 3.0 kg, velocity 1 = 1.4 m/s, mass 2 = 2.0 kg, velocity 2 = 0 m/s
V = 3.0 Ă— 1.4 + 2.0 Ă— 0 â• 3.0 + 2.0
V = 0.84 m/s</span>
Radio waves: they are present in radios and also walkie-talkies
Answer:
Atoms are electrically neutral because there are an equal number of protons in the nucleus and In the cloud around the nucleus.
Explanation:
- The atoms that are the building block of matter consist of protons, neutrons, and electrons.
- The protons are positively charged and the electrons are negatively charged particles.
- The neutrons are negatively charged particles.
- The atoms in its stable natural state consist of an equal number of protons and electrons.
- Thus an atom has a neutral charge in its natural state.