Physics - February 2007

How are vibrations made? I have had this arguement with my brother, he says that IF you could walk and make no sound doing it would you still create vibrations that could be transfered and felt through the ground?

2007-02-01 12:56:55 · 4 answers · asked by David D 1

I know this1 atm / (meter^3) = 101 325 m^-4 kg s^-2


but Joules is 1 atm / (meter^3) = 101 325 m^4 kg s^-2

I am finding work under a graph that is y=atm and x=m^3 and I found the area to be 1.375 atm/m^3 but I need it in Joules!

2007-02-01 12:56:55 · 2 answers · asked by bippidibopiddi 2

What buoyant force is exerted on the bottom of a flat 5 m long, 2 m wide, and .2 m under the surface of pure water? the desnsity of water is 1000 kg/m^3

2007-02-01 12:51:38 · 4 answers · asked by NoturTypicalBI! 3

I'm not too sure how to approach this question:

A string is supposed to vibrate at 200 Hz. It actually vibrates at 205 Hz. What percent should the tension in the string be changed to correct the frequency?

Thanks.

2007-02-01 12:22:08 · 1 answers · asked by nazzyonenine 3

an 80 kg fighter pilot goes into a dive, accelerating downward at 22 meters per second squared. find the magnitude of the downward force that the back of the seat exerts on the pilot.

2007-02-01 12:14:59 · 6 answers · asked by argentina_mandy20 1

a 1.5 kg block of lead is heated from 25 degrees C to 43 degrees C. if this requires 3430 joules of heat energy, what is the specific heat of the block of lead?

2007-02-01 12:11:38 · 2 answers · asked by argentina_mandy20 1

2007-02-01 12:08:01 · 7 answers · asked by 123 2

1.) The following forces act on an object resting on a level, frictionless surface. 10 N to the north, 20 N to the east, 10 N at an angle 40 degrees south of east, and 20 N at an angle 50 degrees west of south. Find the magnitude and direction of the resultant force acting on the object.

2007-02-01 12:03:16 · 2 answers · asked by Anonymous

a ball is thrown straight downward from a height of 75 meters. the initial velocity of the ball is 2 meters per second. (a) find the time it takes for the ball to reach the ground. (b) find the velocity of the ball just before it hits the ground.

2007-02-01 11:56:25 · 6 answers · asked by argentina_mandy20 1

strait in which the current flows at 5.0 m/s. At what angle upstream should the driver head the boat?

2007-02-01 11:56:24 · 1 answers · asked by sakinah_123 1

2007-02-01 11:49:50 · 3 answers · asked by twilight65 2

2007-02-01 11:44:19 · 5 answers · asked by TriManDaTopZzZz 2

Two circus clowns (each having mass of 50kg) swing on two flying trapezes (negligible mass, length 25m). At peak of the swing, one grabs the other, and the two swing back to one platform. The time for the forward and return motion in s is?

2007-02-01 11:41:45 · 1 answers · asked by Shane W 1

If light (travelling at velocity v1=C) is bent upon entering a prism by being slowed down to v2

2007-02-01 11:40:37 · 10 answers · asked by ? 1

A seagoing crane lifts a sealed safe from a sunken ship. The average density of the safe is 5.3 grams/cc and its mass is 120. kg. What is the tension in the lifting cable when the safe is still submerged?

2007-02-01 11:38:50 · 1 answers · asked by Shane W 1

1.30 kilograms of water at 11.0C is placed on a heat source. The water's temperature is raised to 61.0C. How much heat is absorbed by the water?

How do you solve this?

2007-02-01 11:36:19 · 2 answers · asked by Lemonade is Good 5

A electron moving along the x axis has a position given by x = 20 te-2.4 t m, where t is in seconds. How far is the electron from the origin when it momentarily stops?

2007-02-01 11:15:57 · 1 answers · asked by In love with love 2

I recently saw a program suggesting that time travel will be possible in the future. Will it be ???? This is based on a theory of using powerful laser to create a loop in time.

2007-02-01 11:00:59 · 10 answers · asked by Anonymous

sound wave travel at app. 340 m/s, what is the wavelength when the frequency is 20Hz?what is the wavelength of sound with a frequency of 20kHz? can u plz explain for me thx

2007-02-01 10:58:50 · 2 answers · asked by kobay 2

2007-02-01 10:57:39 · 5 answers · asked by sakinah_123 1

A radio station broadcasts their signal with a wavelength of 3.5um (u is the greek letter, i can't think of its name). The radio can translate this into sound, but why can't I hear the radio signal directly.

This is a physics problem. I would just say, because you can't hear radio waves, but I don't know if that will be right.

Does anybody have any answers?

2007-02-01 10:50:52 · 6 answers · asked by cubscaps33 5

2007-02-01 10:40:36 · 4 answers · asked by sakinah_123 1

Whats the amount of energy needed to raise 18kg of cooper from 35°C to 60°C?

What temperature change would 2500 g of iron experience if 42,000 J of energy is added to it?

2007-02-01 10:28:39 · 2 answers · asked by ghettoco 1

Would it take any time for a transverse wave to travel the length of a massless rope? Why?

2007-02-01 10:00:53 · 4 answers · asked by lifewithgooli 1

(a) How many seconds does it take a 25.0-hp motor to lift a 1700-lb elevator a distance of 70.0 ft? ____s
(b) What was the average velocity of the elavator? ____ft/s

2007-02-01 09:31:07 · 2 answers · asked by Hey ;) 3

(a) How many horsepower is a 1900-W blow dryer?
___hp
(b)How many watts is a 3.5-hp lawnmower?
____w

2007-02-01 09:24:41 · 3 answers · asked by Hey ;) 3

2007-02-01 09:21:57 · 3 answers · asked by dj t 1

2007-02-01 09:16:41 · 5 answers · asked by calijen56 1

2007-02-01 09:01:54 · 8 answers · asked by jessika 4

Why is the spacetime interval -(ct)^2 +x^2+y^2+z^2=s^2 ? Also how do we prove that it is invariant from every reference frame?

2007-02-01 08:28:38 · 2 answers · asked by Anonymous