مهندسة ادارية
15-04-2007, 20:51
بسم الله الرحمن الرحيم
السلام عليكم ورحمة الله وبركاته..كيف حالكم اخوتي في الله ...هذه بعض الأسئلة التي أتمنى ان تجيبوا عليها بسرعة ان امكنكم ذلك وهي من كتابphysics for Scientist and Engineering للمؤلف serway jewett
1. The speed of sound in air is 331 m/s. during the next thunderstorm, try to estimate your distance from a lightning bolt by measuring the time lag between the flash and the thunderclap. You can ignore the time it takes for the light flash to reach you. Why?
2. If an object's average velocity is zero over some time interval, show that its instantaneous velocity must be zero at some time during the interval. It may be useful in your prove to sketch a graph of x versus t and to note that Vx(t) is a constant function.
3. A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.0m/s at ground level. Its engines then fire and it accelerates upward at 4.00m/s2 until it reaches an altitude of 1000 m. at that point its engines fail and the rocket goes into free fall, with an acceleration of – 9.8 m/s2 a) How long is the rocket in motion above the ground?b)what is its maximum altitude ?c)what is its velocity just before it collides with the earth ?( you will need to consider the motion while the engine is operating separate form the free-fall motiom)
وشكرا ويعطيكم العافية:o
السلام عليكم ورحمة الله وبركاته..كيف حالكم اخوتي في الله ...هذه بعض الأسئلة التي أتمنى ان تجيبوا عليها بسرعة ان امكنكم ذلك وهي من كتابphysics for Scientist and Engineering للمؤلف serway jewett
1. The speed of sound in air is 331 m/s. during the next thunderstorm, try to estimate your distance from a lightning bolt by measuring the time lag between the flash and the thunderclap. You can ignore the time it takes for the light flash to reach you. Why?
2. If an object's average velocity is zero over some time interval, show that its instantaneous velocity must be zero at some time during the interval. It may be useful in your prove to sketch a graph of x versus t and to note that Vx(t) is a constant function.
3. A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.0m/s at ground level. Its engines then fire and it accelerates upward at 4.00m/s2 until it reaches an altitude of 1000 m. at that point its engines fail and the rocket goes into free fall, with an acceleration of – 9.8 m/s2 a) How long is the rocket in motion above the ground?b)what is its maximum altitude ?c)what is its velocity just before it collides with the earth ?( you will need to consider the motion while the engine is operating separate form the free-fall motiom)
وشكرا ويعطيكم العافية:o