SOLVE IT IF U CAN
Topic: mechanical properties of solids and sound.
Marks = 21 Physics Time = 60 min.
Attempt any seven
1. Define the following terms
i) Amplitude of the wave
ii) Period of the wave
iii) wavelength of the wave 3.
2. Define stress, strain and elastic limit 3.
3. Distinguish between transverse waves and longitudinal waves. 3.
4. Write a note on Young’s modulus of material of wire. 3.
5. State the laws of static friction. 3.
6. Write a note on bulk modulus of material of wire. 3.
7. Obtain the relation between wave speed, wavelength and period. 3.
What happens when waves pass from one medium to the other
Medium. 3.
8. State the laws of kinetic friction. 3.
9. Draw the graph of stress against strain to explain the behavior of wire
Subjected to increasing load. Define breaking stress. 3.
10. Distinguish between elastic bodies and plastic bodies. 3.
Answers
Explanation:
1) (i) --> The amplitude of a sound wave is the measure of the height of the wave. ... It is the distance between crest or trough and the mean position of the wave.
(ii)--> The wave period is the time it takes to complete one cycle. The standard unit of a wave period is in seconds, and it is inversely proportional to the frequency of a wave, which is the number of cycles of waves that occur in one second
(iii)--> Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire. In wireless systems, this length is usually specified in meters (m), centimeters (cm) or millimeters (mm).
2) Elasticity is a measure of how difficult it is to stretch an object. ... Stress is a measure of the force put on the object over the area. Strain is the change in length divided by the original length of the object.
3) In a longitudinal wave, the medium or the channel moves in the same direction with respect to the wave. Here, the movement of the particles is from left to right and force other particles to vibrate.
In a transverse wave will the medium or the channel moves perpendicular to the direction of the wave. Here, the particles move up and down as the waves move horizontally.
4) Where stress is the amount of force applied per unit area (σ = F/A) and strain is extension per unit length (ε = dl/l). Since the force F = mg, we can obtain the Young's modulus of a wire by measuring the change in length (dl) as weights of mass m are applied (assuming g = 9.81 metres per second squared).
5) The law of static friction states that the force of friction, that resists the motion of the body as it starts to fall down the surface, is proportional to the normal (perpendicular) force that the body exerts on the surface. ... The direction of frictional force is always opposite to the motion of one body over the other.
6) Sometimes referred to as the incompressibility, the bulk modulus is a measure of the ability of a substance to withstand changes in volume when under compression on all sides. It is equal to the quotient of the applied pressure divided by the relative deformation.
7) The Relationship between Wave Frequency, Period, Wavelength, and Velocity. just as in the case of harmonic motion of an object. We can see from this relationship that a higher frequency means a shorter period. Recall that the unit for frequency is hertz (Hz), and that 1 Hz is one cycle (or one wave) per second
8) First law: The force of kinetic friction (Fk) is directly proportional to the normal reaction (N) between two surfaces in contact. ... Second law: Force of kinetic friction is independent of shape and apparent area of the surfaces in contact.
9) above picturee
10) Elasticity is the property of solid material that it gains its original shape and size after the removal of applied force. 1)Plasticity is the property of solid material that it does not gain its original shape and size after the removal of applied force. ... It requires more force to cause plastic deformation.
BREAKING STRESS--Breaking stress is the maximum force that can be applied on a cross sectional area of a material in such a way that the material is unable to withstand any additional amount of stress before breaking. ... Breaking stress may also be known as ultimate tensile stress or breaking strength
Yes bro, 5+4 = 9 but he write 8. okk bye and thanks..
