What is meant by focal length of lens

A harmonic wave is traveling along a rope. the oscillator that generates the wave completes 46.0 vibrations in 26.0 s. a given crest of the wave travels 415 cm along the rope in a time period of 11.7 s. what is the wavelength? answer in units of m.

Describe a theme-park ride that has constant speed but changing velocity?

A 66 kg person is parachuting and experiencing a downward acceleration of 2.1 m/s2. The mass of the parachute is 4.0 kg. (a) What is the upward force on the open parachute from the air?

How many neutrons does iodine have

A large chandelier is given a push and allowed to swing. It is hanging from a cable that is 2.8 meters long. The chandelier weighs 184 kg. How long does it take to complete one full swing (returning to its original position) ?

The difference between two numbers is 15. When twice the smaller number is subtracted from three times the larger number, the difference is 58. What is the larger number?

Vector A makes equal angles with x, y and z axis. value of its components (in terms of magnitude of vector A will be?

What has become an important alternative to Piagetian approaches?

How would life on earth be different if earth's axis were not tilted with respect to its orbit? A. There would be no seasons. B. There would be no day and night. C. All places would have the same climate. D. The seasons would be much shorter.

What will a spring scale read for the weight of a 75.0-kg woman in an elevator that moves upward with constant speed of 5.8 m/s?