Physics Answers

A uniform cone of mass 2.0 kg and of height 40 cm, resting on its base, of width 30 cm.​ Calculate:

i) the minimum horizontal pull to the apex which can be applied to raise the edge from the floor. 

a child runs at a constant velocity of 0.90 m/s toward an ice cream truck which is parked 125 m away. If the ice cream truck is only parked for 3 minutes, will the child reach the ice cream truck in time? 

a block of mass 20 kg hangs from a ceiling by a cord. calculate the tension in the cord

12.Two masses are arranged as shown on a ramp that makes an angle of 36° with the horizontal. Mass m1 is twice mass m2.

. What is the minimum coefficient of static friction required between mass and the ramp to ensure

equilibrium?

An aluminium wire with a square cross-section 4 mm on a side is carrying a current of 4.5 amps. Aluminium has a resistivity of 2.69 × 10−6 ohm-cm and an atomic volume of 10 cc/mol. Assuming aluminium has three free electrons per atom, calculate the (a) Hall coefficient, (b) electric field, (c) power dissipated (heat generated) per cm length, and (d) the Hall voltage across the wire in a transverse magnetic field of 1 tesla.

1. Show that the rate of change of the total angular momentum of a system of particles is equal to the resultant torque exerted by all external forces which act on the system. 

A positive particle of charge 1.0 C accelerates in a uniform electric field of 100 V/m. The particle started from rest on an equipotential plane of 50 V. After t = 0.0002 seconds, the particle is on an equipotential plane of V = 10 volts. Determine the distance traveled by the particle.

The period of a simple pendulum is 2.05s, What is the period of another simple pendulum which makes 300vibrations in the time it takes the first pendulum to make 200 vibration

A stone attached to the end of an inelastic string is whirled round in a circular path of radius 20cm. If the stone makes 15complete revolution in 5secs, calculate it's angular and linear velocity

 The object goes from point O to point B in 3 different ways (OAC, OBC, OC) with the force F = -mgh. Is force conservative or not? Prove whether the force is conservative or not.