A frame-by-frame analysis of a slowmotion video shows that a hovering dragonfly takes 7 frames tocomplete one wing beat. If the video is shot at 240 frames per second, (a) what is the period of the wing beat, and (b) how manywing beats does the dragonfly perform per second?

A frame-by-frame analysis of a slowmotion video shows that a hovering dragonfly takes 7 frames tocomplete one wing beat. If the video is shot at 240 frames per second, (a) what is the period of the wing beat, and (b) how manywing beats does the dragonfly perform per second?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter4: Two-and-three Dimensional Motion

Section: Chapter Questions

Problem 72PQ: An observer sitting on a park bench watches a person walking behind a runner. Figure P4.72A is the...

See similar textbooks

Similar questions

Given the following data collected about the velocity of the red light (650 nm) and green light (510 nm) on air. Vred(T=0˚C) = Vgreen(T=0˚C) = Vred(T=11˚C) = Vgreen(T=11˚C) = Vred(T=45˚C) = Vgreen (T=45˚C) What are your conclusions comparing the effect of the temperature and frequency on sound and light velocities? Justify your answer based on the data presented and the physics of sound and light.
A rod moving with a speed v along the horizontal direction is observed to have length and to make an angle with respect to the horizontal as shown in Figure P38.17. (a) Show that the length of the rod as measured by an observer at rest with respect to the rod is p = [1( v2/c2) cos2 ]1/2. (b) Show that the angle p that the rod makes with the x axis according to an observer at rest with respect to the rod can be found from tan p = tan . These results show that the rod is observed to be both contracted and rotated. (Take the lower end of the rod to be at the origin of the coordinate system in which the rod is at rest.)
The speed of light is c = 3.0 x 10^8 m/s. If the distance between the Earth and the moon is d = 2.39 x 10^5 mi (1.0 mi = 1.61 km). You send a laser from the Earth to the moon and back. How long does this take?
Trying to determine its depth, a rock climber drops a pebble into a chasm and hears the pebble strike the ground 3.245 later. (a) If the speed of sound in air is343 m/sat the rock climber's location, what is the depth of the chasm? (b) What is the percentage of error that would result from assuming the speed of sound is infinize?
Your roommate is playing a video game from the latest Star Wars movie while you are studying physics. Distracted by the noise, you go to see what is on the screen. The game involves trying to fly a spacecraft through a crowded field of asteroids in the asteroid belt around the Sun. You say to him, “Do you know that the game you are playing is very unrealistic? The asteroid belt is not that crowded and you don’t have to maneuver through it like that!” Distracted by your statement, he accidentally allows his spacecraft to strike an asteroid, just missing the high score. He turns to you in disgust and says, “Yeah, prove it.” You say, “Okay, I’ve learned recently that the highest concentration of asteroids is in a doughnut-shapedregion between the Kirkwood gaps at radii of 2.06 AU and 3.27 AU from the Sun. There are an estimated 109 asteroids of radius 100 m or larger, like those in your video game, in this region . . .” Finish your argument with a calculation to show that the number of…
Kendra observes a paramecium as it swims along the edge of a ruler. The paramecium starts at the 65mm mark at 9:11:25 a.m and ends at the 38mm mark at 9:12:05 a.m. What is the displacement delta x, in mm for the paramecium’s swim?
9.07 A laser beam aimed from the earth is swept across the face of the moon. Part A If the beam is rotated at an angular velocity of 1.45×10^−3rad/s1.45×10^−3rad/s, at what speed does the laser light move across the moon’s surface? ( 3.84 x10^8) Express your answer with the appropriate units. Part B If the diameter of the laser spot on the moon is 6.10 km , what is the angle of divergence of the laser beam? Express your answer in radians
A child dropped a ball from a building. The sound of it hitting the water of the swimming pool below comes 3.2 s later. How high (in meters) is the child from the pool? Take the speed of sound to be 340 m/s a.) 41.3. b.) 44.2. c.) 43.8. d.) 46.0. e.) 46.3.
An airplane propeller is rotating at 1900rpm. how many seconds does it take for the propeller to turn through 48.0 degrees? if the propeller were Turing at 24rad/s at how many rpm would it be turning? when the propeller were turning at 24rad/s what is the period (in seconds) of this propeller?
1. On OCEAN and during NIGHT TIME, how does sound effectively propagate over a long enough distance if initially directed horizontally? A. Sound flies. B. Sound sinks. C. Sound flies then sinks. D. Sound sinks then flies. E. Sound propagates in a straight path. 2. On LAND and during NIGHT TIME, how does sound effectively propagate over a long enough distance if initially directed horizontally? A. Sound flies. B. Sound sinks. C. Sound flies then sinks. D. Sound sinks then flies. E. Sound propagates in a straight path. 3. On OCEAN and during DAY TIME, how does sound effectively propagate over a long enough distance if initially directed horizontally? A. Sound flies. B. Sound sinks. C. Sound flies then sinks. D. Sound sinks then flies. E. Sound propagates in a straight path.
) A vacationer sits all day on the corner of a pier in Boston Harbor and notices that at 9am, when the water level is at its lowest, the waters depth is 2 feet. At 4 pm, the water has risen to its maximum depth of 12 feet. If the depth of the water level varies sinusoidally, a. Find a formula for the depth of the water as a function of time, t, since 9am. b. What is the water depth at 7pm?c. Sketch a graph of your function showing at least one full period
After a long day at work, you come home to find that someone has come in and stolen several items in your home. Luckily, you have a security camera mounted in the kitchen and are lucky enough to live next door to a grocery store that has cameras outside that view the entire front side of your house. While watching the cameras, you find that one thief was a man and one was a woman. While the woman was in the kitchen, a motion light that was mounted on a wall shined down on her and cast a shadow that was the exact length as the width of the counter, which you measure to find is 5 feet wide. From watching the camera, you know the angle of elevation to the light is between (pi/4) and (4pi/15). The female heights and names are as follows. Amanda is 5 ft 2 inches Karen is 5 ft 6 inches Alissa is 5 ft 7.5 inches Kyla is 6 ft Who could it possibly have been?