# Ph2530

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1. Vibration is the source of wave motion.
2. A wave is disturbance that moves through a medium or through space. A pulse is a nonrepeated disturbance that carries energy through a medium or through space. A wave is a periodic disturbance. A pulse is a one-time disturbance.
3. f = 1/t, the period is halved.
4. (a) Increases (b) Decreases (c) Doesn’t change
5. 448 THz
6. (a) 0.248 m (b) No (c) 0.0411 m
7. 8 minutes 20 seconds
8. 0.122 m
9. 25°, First Law
10. 68°
11. 1.34
12. Light that takes a path from point A to point B will take the same reverse path in going from point B to point A, even if reflection or refraction is involved. So if you can’t see the driver, the driver can’t see you.
13. In spearing a fish with a spear, you should aim below the apparent position of the fish to account for the refraction of the light that you see coming from the fish that makes the fish appear closer to the surface than it really is. In spearing a fish with a laser, make no corrections and simply aim directly at the fish. This is because the light from the fish you see has been refracted in getting to you, and the laser light will refract along the same path in getting to the fish.
14. Light pulses move easily down the fiber-optic line because of a principle known as total internal reflection. This principle of total internal reflection states that when the angle of incidence exceeds a critical value, light cannot get out of the glass; instead, the light bounces back in. When this principle is applied to the construction of the fiber-optic strand, it is possible to transmit information down fiber lines in the form of light…...

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#### Ph2530

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...Alaa Saad 12/12/15 PH2530 Exercise 1.1 1. The turning radius of a car is 36 ft. What will be the distance in meters? 10.97 meters 2. What is the sum of 1370 cm, 1575 mm, and 8.63 m in meters? 23.91 meters 3. The cross-sectional area of a hole is 725 cm2. Given that the area of a circle is A = πr2, find the radius of the hole. 15.19 cm 4. what will be the value of x? x=+ or – (sqrt 3-8y)/2 sqrt y 5. Milwaukee is 121 mi (air miles) due west of Grand Rapids. Maria drives 255 mi in 4.75 h from Grand Rapids to Milwaukee around Lake Michigan. Find: a. Her average driving speed = 47.37 mph b. Her average travel velocity = 76.21 kh/h 6. A rock is thrown down with an initial speed of 10.0 m/s from a bridge in the water. It takes 2.75 s for the rock to hit the water. a. Find the speed of the rock as it hits the water = 36.99 m/s b. How high is the bridge above the water? = 101.7 meters or 333.7 ft 7. What are the characteristics of an object in a state of free fall with respect to its speed and acceleration? Objects in freefall accelerate at 32.2 ft/s squared or at a constant acceleration. 8. An archer needs to hit a bull’s eye on a target at eye level of 60.0 ft away. If the archer fires the arrow from the eye level with a speed of 47.0 ft/s at an angle of 25.0 degrees above the horizontal, will the arrow hit the target? No 9. What is inertia? Discuss which object among the following sets has more inertia and why: a. A more massive object or a less massive......

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