Other Physics Answers

Consider as an example the image of a person 180 cm tall standing 2m from the eye. (a) Calculate the height of the full image at the retina. (b) Find the size of the face in the image and size of the nose. Suppose that the actual size of the persons face is 20 cm, and the nose size is one third of the face.

A diverging lens has a focal length of 10.0 cm. An object 1.5 m tall is placed 50.0 cm in front of the lens. Locate the image. Determine both the magnification and the height of the image. Describe the image.

The escape velocity from the surface of the earth of radius R is v. What is the escape velocity from a height of 2R?

1. Write the properties of EM waves (wavelength, frequency, speed)

2. Properties of vacuum and optical medium (permittivity, parmealibity, and index of refraction.)

3. Relate the two properties from item no. 1 and 2.

4. Explain the conditions for total internal reflection.

5. Applications of total internal reflection in real life situations. (5 examples)

6. Explain the phenomenon of dispersion by relating to Snell's Law.

Write the properties of EM waves (wavelength, frequency, speed)

One person can run 400 m in 58 s and another can run the same distance in 60 s. If they run together, by what distance does the faster runner beat the slower runner?

1.   Determine the image distance and image height for a 5-cm tall object placed 45.0 cm from a double convex lens having a focal length of 15.0 cm. (di = 22.5 cm and hi = -2.5 cm )

An elevator weighing 4000 Ib attains an upward velocity of 4 m/sec in 3 sec with uniform acceleration. Find the apparent weight of a 40 kg man standing inside the elevator during its ascent.

An elevator weighing 4000 Ib attains an upward velocity of 4 m/sec in 3 sec withuniform acceleration. Find the apparent weight of a 40 kg man standing inside the elevator during its ascent

The breaking strength of a string is 500N.

Find the maximum speed that it can attain if a 1.5kg ball is attached at one end while the

other is held stationary and is whirled in a

circle. The string is 0.65m long.