Questions from College Physics

Q: Estimate the number of nucleons found in the body of a 75

Estimate the number of nucleons found in the body of a 75 kg person.

Q: Why can you easily hear sound around a corner due to diffraction

Why can you easily hear sound around a corner due to diffraction, although you cannot see around the same corner?

Q: Stereo speakers should be wired with the same polarity. If by

Stereo speakers should be wired with the same polarity. If by mistake they are wired with opposite polarities, the bass (low frequencies) sound much weaker than if they are wired correctly. Why? Why i...

Q: Two antennas driven by the same electrical signal emit coherent radio waves

Two antennas driven by the same electrical signal emit coherent radio waves. Is it possible for two antennas driven by independent signals to emit radio waves that are coherent with each other? If so,...

Q: A 1.5 V flashlight battery can maintain a current of

A 1.5 V flashlight battery can maintain a current of 0.30 A for 4.0 h before it is exhausted. How much chemical energy is converted to electrical energy in this process? (Assume zero internal resistan...

Q: Water entering a house flows with a speed of 0.20

Water entering a house flows with a speed of 0.20 m/s through a pipe of 1.0 cm inside radius. What is the speed of the water at a point where the pipe tapers to a radius of 2.5 mm?

Q: Five slabs with temperature coefficients of expansion α have lengths L at

Five slabs with temperature coefficients of expansion α have lengths L at Ti = 20°C. Their temperatures then rise to Tf. Rank them in order of how much their lengths increase, greatest to smallest. (a...

Q: A radio station wants to ensure good reception of its signal everywhere

A radio station wants to ensure good reception of its signal everywhere inside a city. Would it be a good idea to place several broadcasting antennas at roughly equal intervals around the perimeter of...

Q: You are serving as a consultant for the newest James Bond film

You are serving as a consultant for the newest James Bond film. In one scene, Bond must fire a projectile from a cannon and hit the enemy headquarters located on the top of a cliff 75.0 m above and 35...

Q: The size of an atom is about 0.1 nm.

The size of an atom is about 0.1 nm. Can a light microscope make an image of an atom? Explain.