Recent content by pupatel

An aluminum bar has the precisely desired length when at 15°C. How much stress is required to keep it at this length if the temperature increases to 35°C? How do I do this? can anyone help me please...

A guitar string is 90 cm long and has a mass of 3.6 g. From the bridge to the support post (= L) is 60 cm, and the string is under a tension of 520 N. What is the frequency of the fundamental and the first and second overtone? :eek:

This seems very easy, but no matter what I do it doesn't give me the right answer...how do I do this? :frown: A cord of mass 0.50 kg is stretched between two supports 27 m apart. If the tension in the cord is 145 N, how long will it take a pulse to travel from one support to the other?

A 25.0 g bullet strikes a 0.600 kg block attached to a fixed horizontal spring whose spring constant is 6.70 * 10^3 N/m and sets it into vibration with an amplitude of 21.5 cm. What was the speed of the bullet before impact if the two objects move together after impact? :eek:

Need help please...I am having trouble with this question... :confused: A mass m at the end of a spring vibrates with a frequency of 0.88 Hz. When an additional 600 g mass is added to m, the frequency is 0.60 Hz. What is the value of m?

A 160 kg horizontal beam is supported at each end. A 300 kg piano rests a quarter of the way from one end. What is the vertical force on the support closest to the piano? How do i do this? :confused:

can anyone help me with this please...? :eek: How much pressure is needed to compress the volume of a steel block by 0.14 percent?

Can someone help me with this...what is the answer to this and how do i get it? :eek: An explosion breaks an object into two pieces, one of which has 1.5 times the mass of the other. If 7800 J were released in the explosion, how much kinetic energy did each piece acquire?

Here's another one that it giving me a lot of trouble...althought it looks easy, i have tried eveything i could to solve it...but still doesn't give me the right answer... An explosion breaks an object into two pieces, one of which has 1.5 times the mass of the other. if 7500 J were released...

I am still confused...I use these equations but it doesn't give me the right answer...

:confused: I was wondering if someone can help me with this problem: Two biilard balls of equal mass undergo a perfectly elastic head-on collison. If the speed of one ball was initially 2.00 m/s and of the other 3.00 m/s in the opposite direction, what will be their speeds after the...