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An arrow is shot straight up at an initial velocity of 250ms How long will it take to hit the ground?
Wiki User
∙ 13y ago
This is a velocity question so u need to use uvaxt
Wiki User
∙ 13y ago
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How do you generate 250ms delay in embedded c?
Use 'usleep' or 'nanosleep'
A bullet with a mass of 0050kg is fired from a gun of a mass 9kg the bullet has a velocity of 250ms What is the velocity with which the gun recoils?
the conversion of momentum law states that the total momentum of twos systems must be equal therefore M1V1 = M2V2 i am assuming the mass of the bullet is 0.0050 kg and not 50kg so (0.0050 * 250) = ( 9 * X) X = (1.25 / 9) X = 0.139 You can't answer these kind of questions with so few parameters. The bullet diameter, barrel length, powder burn rate all greatly effect the answer. The recoil is caused mainly by the gas exiting the barrel, hence muzzle brakes work.
Why did the Apollo 11 radio beep?
Those beeps before and after each voice transmission are called Quindar tones. The reason for these tones was to, essentially, mute and unmute the dedicated phone lines that connected the transmission receiving stations to Mission Control in Houston. Because the phone lines were dedicated the noise between Houston and the capsule would have been constant, annoying and distracting the astronauts. Therefor the Quindar tones were built in. Two tones were used in the Quindar system, named after its manufacturer, both being pure sine waves that were 250ms long. The "intro tone" was generated at 2,525 Hz and signaled the "key down" keypress of the PTT button. The "outro tone" was slightly lower at 2,475 Hz and signaled the release of the PTT button. The tones were generated by special equipment located at Mission Control, and they were decoded by detectors located at the various tracking stations.
How do you make a digital watch program in c?
I'm not going to write the code for you as it wouldn't be platform independent. However I will show you one possible technique using pseudocode. Your program will essentially be an infinite loop. In pseudocode, you would use something similar to the following: X = current_time (in seconds) repeat if X and current_time are equal sleep for 500ms otherwise let X = current_time display X (in hours, minutes and seconds) sleep for 250ms It is important that your program go to sleep for a short period to reduce the number of comparisons it needs to make and thus reduce the processing time taken up by the program. How you achieve this depends on the operating system, but you cannot use a delay loop because this would consume valuable processing time by itself. In general, the sleep function should inform the operating system to put your program into an idle state for a set period of time. When the timer has elapsed, the OS will waken your program. Thus your program will spend the majority of its time in the idle state. The sleep period should be less than a second, but must take into account the time it takes to perform the comparison and to display the results. In the code above, the program will sleep for 1/2 a second when there is no change, and 1/4 a second when there is a change. The periods can be adjusted to improve the accuracy of the watch; if they're too high, the clock may periodically jump a second, but too low and the program takes up valuable processing time doing nothing besides checking the current time. If you're only interested in hours and minutes, then both sleep periods can be increased up to 30 seconds, but for accuracy within a second or so, sleep for 1000ms.
