Other Physics Answers

Two trains A and B are moving towards each other at a speed of 156.2m/s. If the frequency of the whistle emitted by A is 844.6Hz, then what is the apparent frequency of the whistle heard by the passenger sitting in train B. Note that the velocity of sound in air is 340m/s.

3. Each croquet ball in a set has a mass of 0.50 kg. The green ball, traveling at 12.0 m/s, strikes the blue ball, which is at rest. Assuming that the balls slide on a frictionless surface and all collisions are head-on, find the final speed of the blue ball in each of the following situations:

a. The green ball stops moving after it strikes the blue ball.

b. The green ball continues moving after the collision at 2.4 m/s in the

same direction.

c. The green ball continues moving after the collision at 0.3 m/s in the

same direction.

Define the elastic modulus. Explain the different types of elastic modulus.

1+2

b) State and explain Einstein's Photoelectric Effect theory.

1+2

c) 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.

Consider an automobile moving at v mph that skids d feet after its brakes lock. Calculate how far it would skid if it was moving at 2v and the brakes were locked.   

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 sinusoidal wave is described by 𝑦 = (0.48 𝑚) sin(0.555𝑥 − 36.0𝑡) 𝑚, where x and y are in meters

and t is in seconds. Determine for this wave the (a) amplitude, (b) angular frequency, (c) angular wave

number, (d) wavelength, (e) wave speed, and (f) direction of motion.

A metal rod pivots from one of its ends oscillating at 2.0 Hz. A. What is the length of the rod?

B. Would the frequency change if the mass of the rod is varied?

A matter has a body-centered cubic unit cell with a length of 330 𝑝𝑚 along an edge and a density of 8.57 𝑔 𝑐𝑚−3 . Calculate the atomic mass of the matter.

Solid metal cube of side 10cm is heated from 10°c. if the linear expansivity of the metal is 1.2×10-5k-1, calculate the increase in it volume

In Amplitude modulation, Vestigal Side Band (VSB) is one of the technique used to overcome its limitations in terms of power and bandwidth. With this in mind; a. Explain how a VSB signal is generated in the transmitter. b. Draw and compare the frequency spectrum of the original message signal and the spectrum of the VSB signal in a frequency domain. c. Show how the bandwidth of VSB is calculated by writing the equation. d. Give one application of VSB in broadcasting.