You are jogging along Zuma beach when you see a flash of fire up on a cliff, and then you notice the splash of a cannon ball next to you in the ocean. You instantly estimate from the puff of smoke) that the cannon
was fired a horizontal distance of 80 m from the top of a cliff 40 above your position Based on your
observation of the fiery explosion from the mouth of the cannon (as it was fired), you estimate that the
cannon bal was in the air for 3.0 seconds
What was the muzzle velocity of the cannon,
b. At what angle was it fired,
c. what is the y-component of its velocity just before it impacts the water,
d. and what is its velocity - magnitude and
e direction, just before it impects the water.

Follow these directions and answer the questions. 1. set up the ripple tank as in previous investigations. 2. bend the rubber tube to form a "concave mirror" and place in the ripple tank. the water level must be below the top of the hose. 3. generate a few straight pulses with the dowel and observe the reflected waves. do the waves focus (come together) upon reflection? can you locate the place where the waves meet? 4. touch the water surface where the waves converged. what happens to the reflected wave? 5. move your finger twice that distance from the hose (2f = c of c, center of the curvature) and touch the water again. does the image (the reflected wave) appear in the same location (c of c)? you may have to experiment before you find the exact location. sometimes it is hard to visualize with the ripple tank because the waves move so quickly. likewise, it is impossible to "see" light waves because they have such small wavelengths and move at the speed of light. however, both are examples of transverse waves and behave in the same way when a parallel wave fronts hit a curved surface.

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

He viscosities of several liquids are being compared. all the liquids are poured down a slope with equal path lengths. the liquid with the highest viscosity will