Physics Answers

On December 26, 2004, a great earthquake occurred off the coast of Sumatra and triggered immense waves (tsunami) that killed some 200,000 people. Satellites observing these waves from space measured 800 km from one wave crest to the next and a period between waves of 1.0 hour. What was the speed of these waves in m/s and in km/h? Does your answer help you understand why the waves caused such devastation?

A cylindrical tube opened at both ends gas fundamental frequency f in air.tge tube is dipped vertically in water ao that half of it is in water. The fundamntal frequncy of air column is.......a)f. b)2f. c)f/2. d)f/4

An amusement park ride consists of a rotating circular platform 12.2 m in diameter from which 10 kg seats are suspended at the end of 2.76 m massless chains. When the system rotates, the chains make an angle of 25.2 ◦ with the vertical. The acceleration of gravity is 9.8 m/s 2 . What is the speed of each seat? Answer in units of m/s. 

Question 17

One of the main reasons why people constantly try to reduce the mass of objects is to be able to increase its speed and acceleration. All of the factors have an effect on each other. If something has much more mass, then exerting more force will make it move faster. This is an application on which law of motion? Explain

A sound wave of frequency 300 Hz travels with speed 340ms-1 along

the negative x-direction. Each point of the medium moves up and down through a

total distance of 5.0 mm. Determine the necessary parameters to represent the

wave mathematically.

A car accelerates uniformly from rest and reaches a speed of 18.7 m/s in 6.3 s. The diameter of a tire is 39.4 cm.

Find the number of revolutions the tire makes during this motion, assuming no slip- ping.

Answer in units of rev.

A 26.3-kg child jumps off a diving board 1.5m above the surface of a pool. If all of the child’s potential energy is converted into kinetic energy, how fast is the child going when he hits the water?

A large chunk of ice with mass of 15.0kg falls from a roof 8.0m above the ground. Assume air resistance is negligible, kinetic energy is 14.25 J. Determine the speed of the ice when it reaches the ground.

(a) A sphere has a surface uniformly charged with 1.00 C. At what distance from its center is the potential 5.00 MV? (b) What does your answer imply about the practical aspect of isolating such a large charge? Show the process.

A man with a mass of 80 kg sits in a bosun's chair of mass 10 kg. He pulls on the rope he is holding in order to accelerate himself up. He presses down on the seat with a force of 392 N. Find the acceleration of the man and the tension in the rope supporting the pulley