If instead of sinking, an object which weighs 60 N in air simply floats on the w
ID: 1611043 • Letter: I
Question
If instead of sinking, an object which weighs 60 N in air simply floats on the water, what is the weight of the water which is displaced? (A) 80 N (B) 60 N (C) 40 N (D) 20 N A student has a container full of air. In order to increase the air pressure in the container the student could do which of the following? (Choose as many as apply.) (A) Pump more air into the container without changing the volume of the container. (B) Decrease the volume of the container without changing the number of air molecules in the container. (C) Pump some air out of the container without changing the volume of the container. (D) Increase the volume of the container without changing the number of air molecules in the container. Answer the following questions in the space provided. If you wish, you may draw and label diagrams to aid in giving your answers. Where indicated, you must show your calculations to receive full credit for a correct answer. A college student constructs a bookcase using planks of wood placed between stacks of bricks, and fills each shelf completely with books. The wood shelves sag, but do not break. Four years later when the student graduates and moves her books, the wood shelves remain bent and she has to throw them away. Explain the physics of what happened to the planks of wood in terms of stretching and compression. A "deep" is the name given to an ocean area with a depth of more than 5, 490 meters. The density of sea water is 1020 kg/m^3. What is the minimum water pressure (ignoring atmospheric pressure) in an ocean deep? Show your calculations.Explanation / Answer
25.
pressure arises from the collision of the particles of air with the walls of container. more number of particles will result in more number of collisions with container wall and hence more pressure. same number of particles in smaller container will too result in more number of collisions with container wall and hence more pressure.
so we can increase the pressure by choice A and B
26.
the weight of the books caused the wood shelved to bend downward slightly. when the books remains in the same position for a long period , its caused permanent deformation in the shape of the wood shelf since the coefficient of elastcity of wood is small and hence does not retains it original shape after force is applied for long time .
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