Other Physics Answers

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.

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

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

The driver of a 2.0 × 103 kg red car traveling on the highway at 45m/s slams on his brakes to avoid striking a second yellow car in front of him, which had come to rest because of blocking ahead as shown in above Fig. After the brakes are applied, a constant friction force of 7.5 × 103 N acts on the car. Ignore air resistance.

(a) Determine the least distance should the brakes be applied to avoid a collision with the other vehicle? 

(b) If the distance between the vehicles is initially only 40.0 m, at what speed would the collision occur?

(c) Write your conclusive observations on the result obtained from this numerical. i.e. the importance of Physics in daily life.

What is an example of the first law of thermodynamics? 5.0-g bullet traveling at a

speed of 300 m/s enters a tree and exits the other side with a speed of 150 m/s.

Where did the bullet’s lost kinetic energy go, and how much energy was

transferred?

(b) What is the application of thermodynamics in engineering studies

The driver of a 2.0  × 103 kg red car traveling on the highway at 45m/s slams on his brakes to avoid striking a second yellow car in front of him, which had come to rest because of blocking ahead as shown in above Fig. After the brakes are applied, a constant friction force of 7.5 × 103 N acts on the car. Ignore air resistance.

(a) Determine the least distance should the brakes be applied to avoid a collision with the other vehicle? 

(b) If the distance between the vehicles is initially only 40.0 m, at what speed would the collision occur?

(c) Write your conclusive observations on the result obtained from this numerical. i.e. the importance of Physics in daily life.

. (a) Define the interference and diffraction of light.

(b) Write down the difference between the interference and diffraction of light?

(c) Derive an equation for interference of light for bright and dark fringes.

Define the simple harmonic motion (SHM).

(b) Write down the difference between Periodic and SHM?

(c) Derive the differential equation of SHM. A body is in simple harmonic motion is

having an amplitude of 5 cm and a period of 0.2 s. Calculate the acceleration and

the velocity of the body when the displacement is (a) 5 cm (b) 3 cm (c) 0 cm.

Define the dry friction.

(b) Explain the fluid and solid friction with suitable diagrams. A 500 lb box is sitting

on concrete floor. If the static coefficient of friction is 0.7 and the kinetic

coefficient of friction is 0.6. What is the minimum force required to keep the box

moving once it has started moving?

(c) What is the physical significance of dry friction graph?