Why does a balloon filled with hydrogen rises up only to a certain height

A bar magnet whose magnetic dipole moment is A·m2 is suspended from a thread in a region where external coils apply a magnetic field of T. What is the vector torque that acts on the bar magnet? (Express your answer in vector form.)

What is tan - 1 (0.52) ?

Suppose a baseball and a marble are dropped att the same time from the same height. which ball would land first according to aristotle explain

A small box of mass m1 is sitting on a board of mass m2 and length L (Figure 1). The board rests on a frictionless horizontal surface. The coefficient of static friction between the board and the box is? s.

The magnitude of a force is 36units if 1kg, 1m and 1s are taken as fundamental units. Find the value of this force in cgs system

What is the value of 9682 when rounded to three significant figures

Why do atoms move at different speeds depending on wether they are liquids or solids

What are the arrangement of resistors in series

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is