Physics - October 2007

I don't understand how an object can move if the object is pushing me back with equal force when I push it. Please explain.

2007-10-14 06:47:50 · 5 answers · asked by dawance88 2

A ball would go straight through, but a wave will come out circular (depends on how wide the opening is). Why does this happen?

2007-10-14 06:40:30 · 2 answers · asked by Just Me 2

All the surfaces are frictionless .the system is released from rest.Prove that the distance moved by the bigger block at the instant when the smaller block reaches the ground is 0.2m.
(shape of block is like that of a right angled triangle)

2007-10-14 06:21:55 · 1 answers · asked by Anonymous

2007-10-14 05:58:13 · 7 answers · asked by David Hadley 1

A satellite moves at constant speed in circular orbit about the center of Earth and near the surface of Earth. Assume that the magnitude of the acceleration is 9.8 m/s2. Also assume that the radius of the satellite's orbit is the radius of earth.

a) Determine the linear velocity of the satellite
b) computer the period of revolution

** radius of earth = 6,367,442.5 m**

I'm a little confused now that gravity is in the question...Please Help

Thank You

2007-10-14 05:44:00 · 2 answers · asked by Alex M 1

A student drops a stone into a well and hears the sound of the splash 5.0 s later. How deep is the well? The velocity of sound is 331 m/s.

2007-10-14 05:31:06 · 3 answers · asked by Anonymous

i did the lab to find acceleration by different mehtods
newton law a = T/m
and a= 4pi^2 r*f^2 , r= radius, f= frequency

why my answer is not the same

2007-10-14 05:19:16 · 1 answers · asked by jennifer 2

2007-10-14 05:11:18 · 5 answers · asked by Anonymous

A mine car, whose mass is 510 kg, rolls at a speed of 0.5 m/s on a horizontal track, as the drawing shows. A 150 kg chunk of coal has a speed of 0.60 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to rest in the car.

2007-10-14 05:09:13 · 1 answers · asked by Anonymous

A harmonic wave, has a wavelength λ, a period Τ and an amplitude Α.Find the distance y from the equillibrium , the moment t=Τ/4 and when x=λ/6.

the equation of the y is : y=A*sin[2π(t/T - x/λ)]

heeeelp plz!!!!!!!!!!!!!

2007-10-14 05:08:22 · 1 answers · asked by Joey 1

2007-10-14 04:43:58 · 3 answers · asked by Anonymous

A harmonic wave, has a wavelength λ, a period Τ and an amplitude Α.Find the distance y from the equillibrium , the moment t=Τ/4 and when x=λ/6.

the equation of the y is : y=A*sin[2π(t/T - x/λ)]

heeeelp plz!!!!!!!!!!!!!

2007-10-14 04:37:40 · 1 answers · asked by Joey 1

True or False?? urgent???

2007-10-14 04:37:38 · 2 answers · asked by navya 1

An object, after being released from its circular path, travels the distance OA in the same time it would have moved from O to P on the circle. The speed of the object on and off the circle remains constant at the same value. Suppose that the radius of the circle is 4.0 m and the angle is is 29°. What is the distance OA?
____

2007-10-14 04:34:52 · 3 answers · asked by Santina E 1

Would it be earth?

2007-10-14 04:26:14 · 4 answers · asked by Anonymous

Thermal decomposition of 3.0 metric tons of limestone to lime and carbon dioxide requires 5.4 106 kJ of heat. Convert this energy to each of the following units.
(a) joules
J
(b) calories
cal
(c) British thermal units
Btu

2007-10-14 04:24:15 · 2 answers · asked by jnester0289 1

What is the change in internal energy (in J) of a system that absorbs 0.786 kJ of heat from its surroundings and has 0.311 kcal of work done on it?

2007-10-14 04:23:13 · 1 answers · asked by jnester0289 1

how can i create a coin spinning machine with elastic and/or gravitational energy and maximize the the spin time?

2007-10-14 04:15:42 · 1 answers · asked by Anonymous

If the speed of a car is increased by 65%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time.

2007-10-14 03:26:05 · 3 answers · asked by back2back 2

The equation is I = Imax e-t/RC where (I) is the current at time (t), (Imax) is the maximum current, (R) is the resistor and (C) is the capacitor. I don't know what the letter (e) stands for but it is raised to the negative t/RC. I don't know how to solve for this kind of equation, the book didn't give any example on how to do it. Can anyone help me with this? Thanks a lot!

2007-10-14 03:24:19 · 2 answers · asked by KrisLawrence 1

2007-10-14 02:14:41 · 2 answers · asked by Anonymous

I'm taking AS physics, and this was on a GCSE recap test, and was the only one I got wrong, so it's been annoying me.

A mass of 5 kg is raised 20m into the air, and this takes 4s. What was the power used?

I have 2 different equations for power -

Power = mass/velocity

and

Power = work done/time

I used the first one, worked out the velocity as 5ms-1, and got the power as 1 watt. But this was wrong. Since I have used the second one and got 125 watts (im not sure if this is right), and I really dont think it is relevant, but in the previous question I found that the potential energy of the mass from 20m in the air is 1000J.

Can someone please go through this step by step, and explain where Im going wrong with having two different power equations. Thankyou.

2007-10-14 02:07:30 · 3 answers · asked by honourableone 3

Why are the amplitudes of intensity of the pattern generated by single slit diffraction different (gradually decrease as you go away from the center) and yet with double-slit diffraction the intensity of maxima are constant regardless of distance from the center?

2007-10-14 02:05:36 · 1 answers · asked by thatnaweedguy 1

2007-10-14 01:20:57 · 2 answers · asked by Anonymous

I was thinking, sure there's been freak incidents of freefall being survived here and there, but has there ever been a device or stunt where a human has been allowed to fall at full speed and strike the ground, AND survive with little to no damage afterward? I am thinking as an example the Pathfinder landing where it bounced for miles, and also the egg drop contests held in every high school. Weight and volume not a problem, only speed as it cannot be slowed down like a parachute or retro rockets. Has there ever been or can there ever be a device, like a hollow geodesic sphere or balloon, that can cushion a human going 200 miles an hour?

2007-10-14 01:18:52 · 1 answers · asked by Jacob L 1

we know that......when light ray refracts wavelength changes.....we also know that colour is related with wavelength.......so when a red light ray refracts does it change into another coloured ray?????

2007-10-14 01:11:53 · 6 answers · asked by Anonymous

The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 15 g nail when it is struck by a 550 g hammer moving with an initial speed of 3.5 m/s.

This is a practice problem from my physics book. So I didn't copy the question incorrectly. It indeed says elastic...

2007-10-14 01:10:56 · 3 answers · asked by Anonymous

2007-10-13 23:16:29 · 11 answers · asked by red_devil07 2

2007-10-13 20:10:59 · 5 answers · asked by lucylonglegs 1

Bougant Force
(Mass)(volume)
M=700 (10)
M=7000N



REAL MASS
M=1,000(10)
M=10,000N


APP WEIGHT
AP=1,000 – 7,000
AP= 3,000N

2007-10-13 19:44:49 · 6 answers · asked by vvc 1