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Applications Of Reflection Of Light
When a light ray (termed as the incident ray) hits a surface and bounces back (forms a reflected ray), the process of reflection of light has taken place.
Sign Convention for Mirrors
A mirror is made of glass that is coated with a metal amalgam on one side due to which the light ray incident on the surface undergoes reflection and not refraction.
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- A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 18.0 m/s. The cliff is 50.0 m above a flat, horizontal beach as shown in Figure P3.7. (a) What are the coordinates of the initial position of the stone? (b) What are the components of the initial velocity? (c) Write the equations for the x- and y-components of the velocity of the stone with time, (d) Write the equations for the position of the stone with time, using the coordinates in Figure P3.7. (e) How long after being released does the stone strike the beach below the cliff? (f) With what speed and angle of impact does the stone land? Figure P3.7a student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 18.0 m/s. the cliff is 50.0 m above a flat, horizontal beach as shown in figure p3.23. (a) what are the coor- dinates of the initial position of the stone? (b) what are the components of the initial velocity? (c) write the equations for the x- and y-components of the veloc- ity of the stone with time. (d) write the equations for the position of the stone with time, using the coor- dinates in figure p3.23. (e) how long after being released does the stone strike the beach below the cliffe (f) with what speed and angle of impact does the stone land? 23) e) 3.19 secs f) 36.1 m/s 60.1 degrees below the horizontalHenrietta is going off to her physics class, jogging down the sidewalk at a speed of 3.30 m/s. Her husband Bruce suddenly realizes that she left in such a hurry that she forgot her lunch of bagels, so he runs to the window of their apartment, which is a height 52.5 m above the street level and directly above the sidewalk, to throw them to her. Bruce throws them horizontally at a time 9.00 s after Henrietta has passed below the window, and she catches them on the run. You can ignore air resistance. I. With what initial speed must Bruce throw the bagels so Henrietta can catch them just before they hit the ground? (Express your answer in meters per second.) II. Where is Henrietta when she catches the bagels? (Express your answer in meters.)
- A baseball player throws a baseball straight up into the air, in the following way: Starting from a height of 1.0 m above the ground, he accelerates the ball vertically with 30. m/s2 for 0.25 s, then the ball leaves his hand and flies straight up in free fall. Let’s ignore the air resistance. Draw a carefully labeled sketch of the situation. Calculate the velocity of the ball as it leaves the player’s hand. How high does the ball go relative to its initial position (yo=1.0 m)? Shows all work please.Chinook salmon are able to move through water especially fast by jumping out of the water periodically. This behaviour is called propoising. Suppose a salmon swimming in still water jumps out of the water with velocity 6.26 m/s at 45.0˚ above the horizontal, sails through the air a distance L before returning to the water and then swims the same distance L underwater in a straight horizontal line with velocity 3.58m/s before jumping out again (a) determine the average velocity of the fish for the entire process of jumping and swimming underwater (b) time interval reduced by the jumping/swimming process compared with simply swimming underwater at 3.58 M/s?A firework is projected from the level ground in such a way that v0y = 10m/s and v0x = 20 m/s.a) Find the time it takes the firework to reach its maximum height reached.b) Since the firework returns to the ground, it has the same initial and final height. Whenthis happens, the time it takes the object to land is twice the time it takes to reach its maximum height. Using this information, find the horizontal and vertical components of the velocity of the firework right as it lands.
- A mountain climber stands at the top of a 50.0 - m cliff thatoverhangs a calm pool of water. She throws two stones verticallydownward 1.00 s apart and observes that they cause a singlesplash. The first stone had an initial velocity of -2.00 m/s. (a)How long after release of the first stone did the two stones hitthe water? (b) What initial velocity must the second stone havehad, given that they hit the water simultaneously? (c) What wasthe velocity of each stone at the instant it hit the water?Two ducks, Donald and Cassiopeia, are gliding gracefully toward eachother along a pond, in a straight line. Donald is initially moving at v =0.500 m/s, and begins accelerating at 0.100 m/s2 at t = 0 s. Cassiopeiamoves at a constant speed of v = 0.700 m/s. If they are initially separatedby 25.0 m, where will they collide? Take Donald’s initial position as theorigin. How long will it take for them to collide?]=An inquisitive physics student and mountain climber climbs a 55.0-m-high cliff that overhangs a calm pool of water. He throws two stones vertically downward, 1.00 s apart, and observes that they cause a single splash. The first stone has an initial speed of 2.20 m/s. (a) How long after release of the first stone do the two stones hit the water? s (b) What initial velocity must the second stone have if the two stones are to hit the water simultaneously? magnitude m/s direction (c) What is the speed of each stone at the instant the two stones hit the water? first stone m/s second stone m/s
- A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 18.0 m/s. The cliff is 50.0 m above a flat, horizontal beach as shown in Figure P3.23. (a) What are the coordinates of the initial position of the stone? (b) What are the components of the initial velocity? (c) Write the equations for the x- and y-components of the velocity of the stone with time. (d) Write the equations for the position of the stone with time, using the coordinates in Figure P3.23. (e) How long after being released does the stone strike the beach below the cliff? (f) With what speed and angle of impact does the stone land?A boy is running at a constant velocity of 7.20 m/s [E] to catch a bus which isstopped. When he is 36.0 m form the bus, the driver starts to accelerate the bus at 1.20 m/5? [E].Does the boy catch up to the bus? If not, how close does he come to the bus?Nate throws a ball straight up to Kayla, who is standing on a balcony 3.8 m above Nate. When she catches it, the ball is still moving upward at a speed of 2.8 m/s. With what initial speed did Nate throw the ball?A. 7.0 m/s B. 12.3 m/sC. 9.1 m/s D. 10.6 m/s