Other Physics Answers

The un-damped system has angular frequency w = 15 Hz.

The system is then damped with damping constant y = 5 Hz.

At what angular frequency must the system be driven in order to achieve the maximum amplitude?

The resistance of a platinum wire at 0◦C, 100◦C and the boiling point of

sulphur(444.6◦C) is found to be 2.56Ω, 3.56Ω and 6.78Ω respectively. The

resistance of the wire at a temperature t◦C is given by Rt=Ro(1+αt+βt²).

Calculate the ratio α/β.

three uniform rods OA OB and OC are of each unit length and unit mass are relative to the coordinate system OXYZ the coordinates of A B and C are respectively (1,0,0) (0,0,1) and (√3/2,1/2,0) find principal moment of inertia

Three point charges are fixed in place as shown in the figure below. (a) Determine the electric 

potential at point P (assuming V = 0 at infinity). (b) How much electric potential energy would 

an electron placed a point P have?

• q3=15uc

|

0.2m |

0.5m | 0.3m

•---------------•---------•

q1=5.0uc P q2=-10uc

Question. points A force F-200 N acts to pull a fish box of mass 40 kg on a rough horizontal surface of up-0.25. What is the acceleration of

the box (in m/s²)? (g=10 m/s²)

Jeff, who is 6.0 f tall, stands in front of plane mirror. What is the shortest plane mirror that Jeff can use to see his full-sized image?

With solution

The Speed of Light. One night you are out looking up at the stars and an extra-terrestrial spaceshipf flashesacross the sky. The ship is 50 meters long and is travelling at 95 percent of the speed of light. What would the ship's length be when measured from your earthbound frame of reference?

Leo and Christian are twins. At the age of 30, Leo left for a round trip to a distance star in a spaceship with a speed of 0.95c relative to Earth. The whole trip took 20 years according to the shipboard clock. Find the ages when Leo returns

A train of 150m length is going towards north direction at a speed of 10 m/s. A parrot flies at a speed of 5m/s towards south direction parallel to the railway track, find the time taken by the parrot to cross the train? 

Machine, weighing 800 kg; descends with the engine extinguished from a hill 40 m high. The driver presses the train pedal with his foot during the descent. At the top of the hill the car has a speed of 6 m / s while at the bottom of the hill 20 m / s. Find the amount of mechanical energy converted into heat while zoning the car.