Recent content by kriegera

that was a tip equation i got from someone else but they couldn't identify what the 33,000 was which is why I'm skeptical...So - There are 172,000 cubic ft. of water and 1 cubic feet of water=28.32 kg(approximately) AND 215 feet = 65.532 meters...

I did find something that used c = d / Δ t - where c was speed of sound so Δ t = d / c = 15,840/344.4 = 46 seconds but that seems too long a delay for three miles no? As far as thunder and lightning, lightning strikes first b/c it travels faster in air than sound. The speed of a sound...

Homework Statement One of the Niagara turbines uses 172,000 cubic feet of water per minute under a head of 215 ft. What is the horsepower developed? Homework Equations The Attempt at a Solution Below is "research findings" and attempt at a solution but I'm a little leary of the...

T=V/D = T=15840 ft/ 1130ft/s = 14.018 seconds.

Homework Statement A transformer has 500 turns in its primary coil and 4000 turns in its secondary. (a) What will be the voltage in the secondary if the primary voltage is 110? (b) If 5 amperes flow through the secondary circuit of the transformer, what will the current in the primary be...

Still a little lost here: In general, at 68 F (20 C) sound travels at 1130 ft/sec (344.4 m/sec.) 3 miles = 15 840 feet 3 miles = 4 828.032 meters but not sure how to put it together in equation format?

So, there's no numerical way to solve without being given the height of the object?

gosh-sometimes you miss the obvious staring at you. thanks!

So i can leave it in m/s? Where did the 350 come from?

[To convert 213.23 m/s to ft/s we would get: (213.36 m/s)( 3.2808399)= 700 ft/s] Correct?

How would you convert: 213.36 m/s into ft/s? Thanks for the tip! The speed of a gas also depends on its temperature. (Velocity increases with temperature. Temperature also affects density the higher the temp, the lower the density.) Therefore, the velocity of carbon dioxide would differ...

Homework Statement A candle is placed 10 inches from a convex lens whose focal length is 5 in. Where will the image be formed? How large an image is formed? Homework Equations The Attempt at a Solution Here we use the following formula to find where the image will be formed...

Homework Statement Can anyone give me a hand on how to start this? I would attempt a solution but I've tried over and over and can't seem to get anywhere. A man sets his watch at noon by the sound of a factory whistle 3 miles away. If the temperature of the air is 20-degrees C, how many...

Homework Statement My teacher assigned a horsepower problem except that we never covered horsepower. Here's my attempt: One of the Niagara turbines uses 172,000 cubic feet of water per minute under a head of 215 ft. What is the horsepower developed? Homework Equations The...

got it: For 50 Watt lamp  R=110/.4545 = 242.0 Ω For 20 Watt lamp  R=110/.1818 = 605.0 Ω For 75 Watt lamp  R=110/.6818 = 161.3 Ω For 100 Watt lamp  110/.9090 = 121.0 Ω c.) To find total resistance of the circuit in parallel, use R=1/(1/242.0) + (1/605.0) + (1/161.3) + (1/121.0) =...