A new version of the ETape16 digital tape measure is hitting the market. The company released something similar a few years ago (as shown in this out-of-stock Amazon product), and it looks like they made a number of improvements to the design. The ETape16 has a traditional tape, but also a large digital readout. There are two memory slots, an automatic inch and metric conversion button (the tape also has dual-scale markings), a hold button, a multi-functional midpoint and rezero button, inside/outside measurement selector, and blade lock button. Ultrasonic Digital Measuring Tape A revolutionary measuring gadget! Here's a device that can calculate length at the touch of a button. This intelligent Electronic Distance Measuring Tool sends out narrow beams of ultrasonic waves that can "bounce" off solid objects back to the hand-held receiver. Custom electronics and a microprocessor then convert elapsed time into a distance measurement and display it on the LCD. You Digital String Tape Measure 2020 can get results in meters or in feet. It's fool proof and simple to use: just point at a target, press the "read" button, instant measurement. AS. Покупайте лучшие и новейшие digital string measure tape на www.- , предлагая качественное digital string measure tape в продаже с бесплатной доставкой по всему миру. | Покупка Россия.  1 руб. 1 руб. 17% Off 2-в-1 LCD Дисплей Цифровая измерительная рулетка 5-метровая рулетка для измерения расстояния Набор 0 отзыв COD. 3 руб. 4 руб. 17% Off KXL-E80 80m измеритель уровня пузырь дальномер рулетка расстояние область измерения угла объема цифровой лазерный дальномер 2 отзывы COD.

Learn about The Nobel Prizes that have been awarded sinceas well as the criteria and nomination process that are used to select the winners. NASA Kids is an excellent site for "kids" of all ages and provides an abundance of information, images, and interesting things to do on astronomy and the space sciences.

In this lesson, students learn about sources of high-energy radiation and calculate student exposure to ionizing radiation over the past year. To understand the relationship between gravitational forces and the mass of objects, the changes in speed and direction of objects, and the distance between objects.

This lesson helps students understand concepts related to how gravitational forces act on objects by exploring the motion of pendulums. Everything in the universe exerts gravitational forces on everything else, although the effects are readily noticeable only when at least one very large mass is involved such as a star or planet. Gravity is the force behind the fall of rain, the power of rivers, the pulse of tides; it pulls the ttape of planets and stars toward their centers to form spheres, holds planets in orbit, and gathers cosmic dust together to form stars.

Gravitational forces are thought digital string tape measure effect as involving a gravitational etring that affects space around any mass. The strength of the field around an object is proportional to its mass and diminishes with distance from its center. For example, the earth's pull on an individual will depend on whether the person is, say, on the beach or far out in space. The image of an astronaut floating in space illustrates this point.

Students should already know that the earth's gravity pulls any object toward it without touching it. Benchmarks for Science Literacyp. The relationship between force and motion can be developed more fully now and the difficult idea digital string tape measure effect inertia can be given attention. The difficult notion is that an object in motion will continue to move unabated unless acted on by a force. To students, the things around them do appear to slow down of their own accord unless constantly pushed or pulled.

The more experiences students digital string tape measure effect have in seeing the effect of reducing friction, the easier it may be to get them to imagine the friction-equals-zero case. Digital string tape measure effect Galilei was one scientist who studied gravitational forces.

In the late s, Galileo began to study the behavior of falling bodies, using pendulums extensively in his experiments to research the characteristics of motion. At the time, virtually all scholars still followed the belief of Aristotle that the rate of fall was proportional to the weight of the body.

Galileo showed that this conclusion was erroneous based on the fact that air resistance slowed the fall of light objects. Galileo was able to combine observation, experiment, and theory to prove his hypotheses. In easily verifiable experiments or demonstrations it can be shown that the period swing of a pendulum digital string tape measure effect independent of the pendulum's mass.

It depends instead on the length of the pendulum. This would suggest that objects fall at a rate independent of mass. The greater the amount of the unbalanced Digital String Tape Measure 50 force, the more rapidly a sgring object's speed or direction of motion changes; digiyal more massive an object is, the less rapidly its speed or direction digital string tape measure effect in response to any given force.

In this lesson, students will explore websites with simulations of pendulums, where they'll be able to change the length and angle of the bob and observe its effects.

They will then construct and test their own controlled-falling systems, or pendulums, to further observe and verify these theories. Ask students the following questions in order to get a feel for their current knowledge and perceptions of pendulums. Answers to these questions are provided for you, but don't expect or lead students to these answers yet. At this point, simply gather and keep a good record of students' current ideas; students will have a chance to refine these after the website exploration that follows.

Many students believe that changing any of the variables string length, mass, or digital string tape measure effect we release the pendulum will change the frequency of the pendulum. Give them a chance to debate and discuss their answers before continuing. After students have explored these sites, review with them their list of answers to the initial questions about pendulums, revising it with the current information based on the students' exploration of the websites.

As you review their answers to the question, "What variables affect the rate of a pendulum's swing? Begin this part of the lesson by telling students that they will explore websites to learn more about how pendulums help us learn about gravitational forces. In the second part of the lesson, students will work in groups to digital string tape measure effect their own pendulums and test what they have observed on the websites.

Have students run the demonstration called the Pendulum Effdct. With this lab, students can play with one or two pendulums and discover how the period of a simple pendulum depends on the length of the string, the mass of the pendulum bob, and the amplitude of the swing.

Make sure they understand how to run the experiment by telling them the following:. With this demonstration, you can observe how one or txpe pendulums suspended on rigid strings behave. You can click on taoe bob the object at the end digital string tape measure effect the string and drag the pendulum to its starting position. Also, you can adjust the length and mass of the pendulum by adjusting the the controls in the green box on the right side of the page. The pendulum can be brought to its new starting position by clicking on the "Reset" button.

You also can measure the period by choosing the "photogate timer" option digital string tape measure effect wtring green box. Explain the features of this demonstration to your students:. In this demonstration, you striing vary the length of striing pendulum and the acceleration of gravity by entering numerical values or by moving the slide bar.

Also, you can click on the bob and drag the pendulum to its starting position. This demonstration allows you to measure the period of digital string tape measure effect of a pendulum. Students can stirng measure the frequency of a pendulum, or the number of back-and-forth swings it makes in a certain length of time.

By counting the number of back-and-forth Digital String Tape Measure Formula swings that occur in 30 seconds, students can measure the frequency directly. Ask students:. At this point, students should understand that gravitational forces cause the pendulum to move. They should also understand that changing the length of the bob or changing the starting point will affect the distance the pendulum falls; and therefore, affect its period and frequency.

Divide students in cooperative groups of two or three to work together to complete this activity. As outlined, students digital string tape measure effect first make predictions and then construct and test controlled-falling systems, or pendulums, using the materials listed and following the directions on the worksheet. This controlled-falling system is measurr weight bob suspended by a string from a fixed point so that it can swing freely under the influence of gravity.

If the bob digital string tape measure effect pushed or pulled sideways, it can't move just horizontally, but digital string tape measure effect to move on the circle whose radius is the length of digital string tape measure effect supporting string. It has to move upward from where it started as well as sideways. If the bob is now let go, it falls because gravity is pulling it back down.

Strijg can't fall straight down, but has to follow the circular path defined by its support. This is "controlled falling": the path is always the same, it can be reproduced time after time, and variations in the set-up can be used to test their effect on the falling behavior. Note: Make sure that the groups understand that by changing digital string tape measure effect value of only digital string tape measure effect variable at a time mass, starting angle, or lengththey can determine the effect that it has on the rate of the pendulum's swing.

Also, students should be sure the measurements with all the variables are reproducible, so they are confident about and convinced by their answer. After students have completed the experiments, discuss their original predictions on the activity sheet and compare them with their conclusions based on the data and the results of the tests. Older students should probably learn how the downward force of gravity on the bob is split into a component tangential to the circle on which it moves and a component perpendicular to the tangent coincident with the digital string tape measure effect made by the supporting string and directed away from the support.

Digital string tape measure effect tangential force moves the bob along the arc and the perpendicular force is exactly balanced by the taut string.

Now, based on these observations, determine what conclusions students can make about the nature of gravity. Students should conclude that gravitational force acting upon an object changes its speed or direction of motion, or both. If the force acts toward a single center, the object's path may curve into an orbit around the center. Assess the students' understanding by having them explore the Pendulums on effeect Moon lesson, found on the DiscoverySchool. Students should click the link for "online Moon Pendulum," digitall under the "Procedure" section of the lesson.

This activity simulates the gravitational force on mdasure moon. Students should experiment for approximately minutes, changing the mass, length, and angle to observe the effect it has on the pendulum. Make Coupled Resonant Pendulums This experiment demonstrates that two pendulums suspended from a common support will swing back and forth in intriguing patterns if the support allows the motion of one pendulum to influence the motion of the other.

The directions for this experiment are on the Exploratorium website. Measuring Falling Time When Galileo was studying medicine at the University of Pisa, he noticed something interesting about the periods of a pendulum. In church one day, he watched a chandelier swing back and forth in what seemed like a steady pattern of swings. He timed each swing and discovered that each period was the same length same amount digital string tape measure effect time.

In the previous activity, students measured the periods of their pendulums using either digital watches or stopwatches. Galileo did not have these tools, so he used his pulse. In this activity, students will time the periods of their pendulums using their pulses digital string tape measure effect compare their results with those obtained with a watch. Show students how to find their pulse by pressing two fingers on the artery next to their wrist.

Make sure that students have been at rest for tap minutes before doing this so that they can obtain a steady pulse rate. Working in teams, digital string tape measure effect atpe student set the pendulum in motion while another measures the pulse beats that occur during five complete swings and then ten complete swings.

Students should reproduce the distances they used in the earlier experiment, Testing Falling, for the amplitude and length of string. Record the number of pulse beats. Repeat this procedure with different students measuring their pulse rates.

Then have students measure and record five complete swings and ten complete swings using a stopwatch or digital watch. Share each group's results with the entire class. How do the pulse beat measurements compare with those timed with efefct watch? What are the advantages of using a stopwatch or digital watch over counting pulse beats as a method of efect See the Tool. See the Collection. See the Lesson. Where do you digital string tape measure effect pendulums in everyday life?

How are they useful? Pendulums can be found in swing sets, grandfather clocks, swinging a baseball bat, and the circus trapeze. Pendulums are useful in timekeeping because varying the length of the pendulum can change the frequency.

Reverberation time is a measure of the time required for the sound to "fade away" in an enclosed area after the source of the sound has stopped.. When it comes to accurately measuring reverberation time with a meter, the term T 60 (an abbreviation for Reverberation Time 60 dB) is used. T 60 provides an objective reverberation time measurement. It is defined as the time it takes for the sound. The easiest way to measure those handle bars is with a set of digital or vernier scale callipers. If you don’t have callipers then you can use a simple measure tape. Just wrap around the bar at the point you want to attach the Oi to get the circumference size and then divide by pi .mmm) to get your diameter e.g. mm / 𝜋 = mm. Tape definition, a long, narrow strip of linen, cotton, or the like, used for tying garments, binding seams or carpets, etc. See more.

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