Several Problems with different topics: Magnetism, Electricity, etc.

I need the process and the answers to the solutions. Not just the way to get the answers but also the values inserted in the process followed by a Answer = . Please take your time because I've gotten some way off answers and it cost me points on my test because I was mislead on my homework. I wrote this before and I am including it again so that we are both clear and there is no missunderstandings.. Thank you. 1.After bungee jumping off a bridge, a person begins to swing as a pendulum, the rope being 77m long. The person's speed is 14m/s as it passes through it lowest point. A). Find the height to which it rises above this position before stopping and B). What angle does the pendulu... click for more

Electricity and magentism questions.

This is for Jhansi, Utter Pradesh, India OTA ID#103642 ONLY no others please.... Here are all the questions 1.After bungee jumping off a bridge, a person begins to swing as a pendulum, the rope being 77m long. The person's speed is 14m/s as it passes through it lowest point. A). Find the height to which it rises above this position before stopping and B). What angle does the pendulum then make with the vertical? 2.a mine explodes at sea, and there is an interval of 5.0sec between the arrival of the sound through the water and its arrival through the air at a nearby ship. How far away is the mine from the ship? 3. The Earth has a net charge that produces an electric field of app... click for more

Sound frequency

Not sure how to do the question, can you please show me? A Battery-operated toy emites a singal at 1800Hz. It moves in a circle of a radius 1.2 m at 2.4 revolutions per seconds. What are the minimium and maximum frequencies heard by a stationary observer some distance away in the plane of the circle? Assume the speed of sound is 330 ms-1

Calculating radiated power

The explosion of the firecracker in the air at a height of 40m produces a 100 db sound level at the ground below. If the threshold of hearing is 10-12Wm-2 what is the instantaneous total radiated power, assuming that it radiates as a point source?

Finding the sound wave

At an open-air concert a person sits at a location that is 7m and 9.10m, respectively, from speakers at each side of the stage. A musician plays a singale 494 Hz tone, explain what the listener hears. Assume the speed of sound is to be 346ms-1.