A piano note of unknown frequency f and a tuning fork with

Question

Question 1- What is the minimum number of 1/2 cm expansion joints that must be put in a 100-m wall made of sheets of plasterboard in order to prevent buckling if the temperature can range from -5°C to 40°C? (Plasterboard has a coefficient of linear expansion, α = 5 x 10^-6 K^-1)

Question 2- A 12-kg mass on a spring undergoes SUM with a period of 16 s. Its amplitude is 5.0 cm. Draw a sketch of the situation, list knowns and unknowns, and then find the spring constant, k.

Question 3- Explain, using the atomic model of matter,

(a) Why hot air rises from the baseboard heating unit in a room.

(b) Why cold air sinks to the bottom of a refrigerator.

Question 4- A stretched string is 4.5 m long vibrates in a standing wave pattern with 6 loops. The vibrating string has a frequency string has a frequency f = 360 Hz. Draw a sketch of the situation then answer the questions.

Question 5- A piano note of unknown frequency, f, and a tuning fork with f= 384 Hz are both sounded at the same time. Beats are heard. The frequency of the beats, f_beat = 4 Hz. When the same piano key is played at the same time as a tuning fork with frequency 395 Hz, the beat frequency is 7 Hz. What is the frequency of the piano note?

Question 6- Two pots are identical except that the flat bottom of one is aluminum, whereas that of the other is steel. Water in these pots is boiling away at 100.0°C at the same rate. The temperature of the heating element on which the aluminum bottom is sitting is 180.0°C. Assume that heat enters the water only through the bottoms of the pots and find the temperature of the heating element on which the copper bottom rests. (k for aluminum = 240 J/(s • m • C°), k for steel =14J/(s • m • C^o)).

Answer 1

For the physics questions illustrated below, write answer to all questions by solving the given numerical and please show the whole methodical part all along with the formulas used. Please provide the answer with appropriate unit. Q1. Find out the minimum number of 1/2 cm expansion joints which must be place in a 100 m wall made of sheets of plasterboard in order to prevent the buckling if temperature can range from -5°C to 40°C? Q2. A 12 kg mass on the spring undergoes SUM by means of a period of 16 s. Its amplitude is 5.0 cm. Draw a sketch of the condition, list known and unknowns, and then determine the spring constant, k. Q3. Describe, by using the atomic model of matter a) Explain why hot air increases from baseboard heating unit in a room. b) Explain why cold air sinks to the bottom of the refrigerator.