Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor . Who will have to apply a larger force and why ?

Describe how the two figures below are alike and how they are different.Which box has larger lateral surface area?

A square and a rectamgular field with measurements as given in the figure have the same perimeter.Which field has a larger area?

Imagine an atom made up of a proton and a hypothetical particle of double the mass of the electron but having the same charge as the electron. Apply the Bohr atom model and consider all possible transitions of this hypothetical particle to the first excited level. The longest wavelength photon that will be emitted has wavelength lambda (given in terms of Rydberg constant R for the hydrogen atom) equal to

A cricket ball having a mass of 0.15 kg is moving with uniform speed of 126 km/h strikes the bat of the player at its middle who holds it firmly at its position. After hitting the bat the ball moves straight back along the same path. If the collision is assumed to be perfectly clastic and bat and ball remain in contact only for a small fraction of time 0.001s the force that batsman has to apply to hold the ball for that short interval would be:

A woman pushes a trunk on a railway platform which has a rough surface. She applies a force of 100 N over a distance of 10m. Thereafter, she gets progressively tired and her applied force reduces linearly with distance to 50 N. The total distance through which the trunk has been moved is 20m. Plot the force applied by the woman and the frictional force, which is 50 N versus displacement. Calculate the work done by the two forces over 20 m.

A body of weight 64 N' is pushed with justs enough force to start it move in across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are 0.6 and 0.4 respectively, the acceleration of the body will be (Acceleration due to gravity = g):

Two syringes of different cross sections filled with water are connected with a tightly fitted rubber tube filled with water . Diameters of the smaller piston and larger piston are 1,0 cm and 3.0 cm respectively. (a) Find the force exerted on the larger piston when a force of 10N is applied to the smaller piston. (b) If the smaller piston is pushed in through 6.0 cm, how much does the larger piston move out?

The boiling point elevation and freezing point depression of solutions have a number of partical applications. Ethylene glycol (CH_(2)OH-CH_(2)OH) is used in automobile radiatiors as an antifreeze because it lowers the freezing point of the coolant. The same substance also helps to prevent the radiator coolant from boiling away by elevating the boiling point. Ethylene glycol has low vapour pressure. We can also use glycerol as an antifreeze. In order for the boiling point elevation to occur, the solute must be non-volatile, but no such restriction applies to freezing point depression. For example, methanol (CH_(3)OH) , a fairly volatile liquid that boils only at 65^(@)C , is sometimes used as an antifreeze in automobile radiators. If the cost of glycerol, glycol, and methanol is same, then the sequence of economy to use these compounds as antifreeze will be