Why can't vectors be added algebrically?
Scalar quantities can be added algebraically. However, vector can&rsqu...
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Q: How does the wave pattern of a loud note differ from a soft note?
A: The relation between loudness (β) and amplitude is shown below:
Q: Give reason why the efficiency of a movable pulley is always less than 100%.
A: For a pulley,
Q: The focal length of a convex lens is 25cm.Express its power with sign.
A: Formula for the power of a lens is:
Q: Name the device used to decrease the volatge at sub station for its supply?
A: Voltage and current at substation is altered with the help of a device known as Transformer. Transfo...
Q: A pebble is thrown up. It goes to a height and then comes back on the ground. State the different ch...
A: As the pebble moves upward, the kinetic energy of the pebble starts getting converted to potential e...
Q: Icecream appears colder to the mouth than water at 0 degree C. Give reason.
A: Click to see the answer
Q: What are the (a) lowest and (b) highest energies in eV available to the electron in a hydrogen atom?...
A: (a) Calculating the lowest energy of electron available in hydrogen atom:
Q: Name the factors on which the heat produced in a wire depends when current is passed in it.
A: Write the joule’s equation of electric heating.
Q: What is degraded energy?
A: The thermal energy that transferred into the surrounding environment after any process. Once release...