The cross sectional area of an optical fibre is 6.3 x 10^-6 m^2 The intensity of the light entering the optical fibre is 3.2 x 10^7 W/m^2 Calculate the power of the light entering the optical fibre

What is the ratio of the earth's orbital period about the sun to the earth's period of rotation about its own axis?

Sirius has an apparent magnitude of - 1.5. Canopus has an apparent magnitude of - 0.7. Which of the following statements is true? Sirius is brighter than Canopus. Sirius is hotter than Canopus. The brightness ratio is 1.5 : 0.7.

Problem page a cyclist traveled 20 kilometers per hour faster than an in-line skater. in the time it took the cyclist to travel 80 kilometers, the skater had gone 30 kilometers. find the speed of the skater.

An electron is moving at a speed of 4.8 * 10 6 m/s at an angle of 30.0° with respect to a uniform magnetic field of 9.2 * 10 - 4 T. What is the radius of the resulting helical path? (me = 9.11 * 10 - 31 kg, qe = 1.60 * 10 - 19 C)

An ambulance emits a frequency of 450 Hz from its siren. What frequency is heard by a man as the ambulance moves toward him?

the acceleration of gravity is 28 times on sun than earth. Imagine there is a space suit that let you stand on sun. Calculate the weight of 100 kg person on earth in newtons

A force of 20 n acts upon a 5 kg block, calculate acceleration of the object

What resultant force is needed to accelerate a train of mass 3.41000000 kg from rest to 15.0ms in exactly 20s

I to fall in love with someone or to at least get a boyfriend

Is rain falling a contact or noncontact force