As you throw a heavy ball upward, is there any change in the normal force on your feet?

A pebble of mass 0.05 kg is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble, (a) during its upward motion, (b) during its downward motion, (c) at the highest point where it is momentarily at rest. Do your answers change if the pebble was thrown at an angle of 45^@ with the horizontal direction? Ignore air resistance.

A child throws a rubber ball upward , then what type of work is done in two situations given below ? Positive or negative . (a) Force given by a child . (b) By gravitational force of the earth .

A small spherical monoatomic ideal gas bubble (gamma=5//3) is trapped inside a liquid of density rho (see figure). Assume that the bubble does not exchange any heat with the liquid. The bubble contains n moles of gas. The temperature of the gas when the bubble is at the bottom is T_0 , the height of the liquid is H and the atmospheric pressure P_0 (Neglect surface tension). As the bubble moves upwards, besides the buoyancy force the following forces are acting on it

A person throws balls upward in regular intervals of time of 2 s. What should be the speed of throwing of balls such that both balls remain in air ?

A person throws balls upward in regular intervals of time of 2 s. What should be the speed of throwing of balls such that both balls remain in air ?

A block is placed on the horizontal surface. There are two forces acting on the block. One, the downward pull of gravity and other a normal force acting on it. Are these forces equal and opposite? Do they form action - reaction pair? Discuss with your friends.

One hard and stormy night you find yourself lost in the forest when you come upon a small hut. Entering it you see a crooked old woman in the corner hunched over a crystal ball. You are about to make a hasty exit when you hear the howl of wolves outside. Taking another look at the gyspy you decide to take your chances with the wolves, but the door is jammed shut. Resigned to a bad situation you approach her slowly, wondering just what is the focal length of that nifty crystal ball. If the crystal ball is 20 cm in diameter with R.I = 1.5 , the gypsy lady is 1.2m from the ball , where is the image of the gypsy in focus as you walk towards her?

You are given following seeds : Maize, Bean, Wheat, Green gram (Mung), Rice, Groundnut. Classify them into monocot and dicot seeds. Select any one dicot seed and dip in water for about 4 to 5 hours. Press it and observe the part of embryo. Is there any change in size of cotyledon as seed germination progresses ?

Can you say that salt is a liquid on the basis of change in its shape? Justify your answer. Take a sponge. Observe its shape.