Physics Answers

list down 3 sports/events that utilizes the concept of Torque and briefly explain how this concept is used.

the sum of the potential differences across the components in a series circuit is equal to the total potential difference across the supply.

a) Define elasticity of a matter.

b) Define stress and strain. Explain different types of stress and strain. 1+4

c) The radius of a silver bar is 30 𝑐𝑚. What force is required to stretch the bar by 12.7% of its length where Young’s modulus is 𝑌 = 7.25 × 1010 𝑁𝑚−2 .

Find the moment of inertia of adisc of radius 0.4m and mass 0.75 kg.

Table 2.5 shows how the velocity of a car changed during part of a journey along a main road. (a) Draw a velocity–time graph for the journey. (b) Write a brief description of the journey. (c) The car’s speed changed during two parts of the journey. Calculate its acceleration at these times. Table 2.5 Data for part of a car journey – see Question 6 Velocity (m/s) 16 20 24 24 24 21 18 Time (s) 0 10 20 40 60 70 80

If 12𝑁 force is applied to a fluid of cross-section 5.34 𝑐𝑚2 with a shearing rate of

0.7 𝑠

−1

then find the viscosity of the fluid.

Radio wave travel at the speed of light. Radio station KSTX broadcast at a frequency of 89.1 MHz. What is the wavelength of the radio station ratio wave

collagen fiber with a diameter of 500 mkm is stretched with a force of 150 mN. what is the bulk energy density in this fiber if the young’s modulus for it is 4.35 GPA ?

An air table has two pucks; one with a mass of 0.50kg and the other with a mass of 1.50kg.  Initially the smaller puck is moving at 0.40m/s, 0° while the larger puck is moving at 0.40m/s, 180°.  After the collision, the smaller puck is moving at 0.79m/s, 196°.  What is the velocity (magnitude and direction) of the larger puck after the collision?

A capillary tube with an inside radius of 638 𝑛𝑚 can support a 100 𝑚𝑚 column of

liquid that has a density of 820 𝑘𝑔𝑚-3. The observed contact angle is 12.5°. Find

the surface tension of the liquid for ℎ = 20 𝑐𝑚