When a mountaineer who eats food, gets warm a lot during a climb and does a lot of mechanical work in raising himself upwards. When he descents, again he also gets warm during descent. Is the source of this energy the same as during the ascent.

A body is projected directly up a plane which is inclined at an angle theta to the horizontal. It was found that when it returns to the starting point its speed is half its initial speed. (a) Was dissipation of mechanical energy of the body, due to friction, higher during ascent or descent? (b) Calculate the coefficient of friction ( mu ) between the body and the incline.

When water is heated to a temperature x, it gets converted into steam at temperature x by a process called R. And when steam at temperature x is cooled, it gets reconverted into water at the same temperature x by a process called S. (a) How much is the value of x in Kelvin ? (b) What is the process R called ? (c ) What is the name of the energy absorbed during the process R ? (d) What is process S known as ? (e) What is the name of energy released during the process S known as ?

Many people who are looking to get a pet dog get a puppy. There are many reasons why people get puppies. After all, puppies are cute, friendly, and playful. But even though puppies make good pets, there are good reasons why you should consider getting an adult dog instead. When you get a puppy, you have to teach it how to behave. You have to make sure that the puppy is housebroken so that It does not go to the bathroom inside the house. You have to teach the puppy, not to jump up on your guests or chew on your shoes. You have to train the puppy to walk on a leash. This is a lot of work. On the other hand, when you get an adult dog there is a good chance that it will already know how to do all of the previously mentioned things. Many adult dogs have already been housebroken. Many adult dogs will not jump on or chew things that you do not want them to jump on or chew. Many adult dogs will be able to walk on a leash without pulling you to the other side of the street. Puppies also have a lot of energy and want to play all of the time. This can be fun, but you might not want to play as much as your puppy does. Puppies will not always sleep through the night or let you relax as you watch television. On the other hand, most adult dogs will wait on you to play. What is more, they will sleep when you are sleeping and are happy to watch television on the couch right beside you. There is one last reason why you should get an adult dog instead of a puppy. When most people go to the pound to get a dog, they get a puppy. This means that many adult dogs spend a lot of time in the pound and some never find good homes. So if you are looking to get a dog for a pet, you should think about getting an adult dog. They are good pets who need good homes. In the final paragraph, the author says "many adult dogs spend a lot of time in the pound, and some never find good homes." Based on the passage, why is this most likely?

Manoj wanted to do social work work during vacations. He visited a remote village where there was no electricity. He made up his mind to help the villagers for getting the solar panels. For this he educated the villagers about the technology and uses of solar panels. He requested the villagers to apply for the same to the government as the same was given to the villagers on subsidised rates. Villagers agreed and applied for the solar panels. They got the same from government at reduced price. When the solar panels started working, the villagers were very happy. Read the above passage and answer the following question: (i) What is solar panel? (ii) What is the basic principle of working of a solar cell? What are the basic values you assess in manoj?