Physics - October 2006

then, choose the correct option-
(a) the hollow sphere reaches the bottom first
(b) the solid sphere reaches the bottom with greater speed
(c) the solid sphere reaches the bottom with greater kinetic energy
(d) the 2 spheres will reach the bottom with the same linear momentum.

the correct answer, according to my book, is (b) option......can u explain why....? feel free to use torque, moment of inertia, etc etc....in ur explanation......

2006-10-15 05:02:52 · 6 answers · asked by Anonymous

For example, a soccer ball and a tennis ball and a marble were all launched at 12.8m/s horizontally. How come the trajectory of the projectile is the same for all these objects?

2006-10-15 04:27:17 · 8 answers · asked by Rhodri 1

2006-10-15 04:17:00 · 3 answers · asked by Anonymous

2006-10-15 04:15:12 · 4 answers · asked by Anonymous

2006-10-15 04:12:46 · 5 answers · asked by Anonymous

2006-10-15 04:11:51 · 7 answers · asked by aarthick 1

When a rectangle is constructed in order to add velocities, what represents the resultant of the velocities? The diagonal right? Not a vertical side, the horizontal side or something else.

2006-10-15 03:58:46 · 5 answers · asked by vintagex50s 2

If a Boeing 747 is flying at 15000 feet, night time and clear skies, can a bonfire be seen from out the aircraft. If so how big must the fire be and what is the maximum altetude allowed to spot a bonfire on the ground?

2006-10-15 03:49:32 · 13 answers · asked by Raldo 1

you know that water vapor condenses from air when the air temperature is lowered. Should it be possible to condense oxygen from air? what would have to happen?

2006-10-15 03:41:46 · 4 answers · asked by Leonard 1

this is hawking's theory...could somebody explain to me?

2006-10-15 03:29:21 · 5 answers · asked by San 2

pls send me fast as possible.....

2006-10-15 03:24:11 · 5 answers · asked by marco e 1

A mass, m1 = 5.00 kg, resting on a frictionless horizontal table is connected to a cable that passes over a pulley and then is fastened to a hanging mass, m2 = 9.0 kg, as in Figure P4.25. Find the acceleration of each mass and the tension in the cable.

FInd acceleration of m1 and m2 and tension in Newtons

2006-10-15 03:05:58 · 3 answers · asked by paul_da_pimp90 1

Since water is made of H2O lets ask a hypothetical question.I have an area that is devoid of any matter. I add 1000 atoms of Hydrogen and 500 atoms of Oxygen, seperately. Will I come up with water? If not why and if so what bonds the two? If I make the assumption that bonding takes place will I have 500 "droplets" of water or will I just have x random amount of droplets with other individual atoms hanging around?

2006-10-15 03:05:36 · 13 answers · asked by keegahill1960 1

2006-10-15 02:42:06 · 11 answers · asked by Anonymous

A mass, m1 = 5.00 kg, resting on a frictionless horizontal table is connected to a cable that passes over a pulley and then is fastened to a hanging mass, m2 = 9.0 kg, as in Figure P4.25. Find the acceleration of each mass and the tension in the cable.

FInd acceleration of m1 and m2 and tension in Newtons

2006-10-15 02:37:46 · 3 answers · asked by paul_da_pimp90 1

A 5.1 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 3.4 m/s2, find the force exerted by the rope on the bucket.

2006-10-15 02:21:11 · 3 answers · asked by paul_da_pimp90 1

2006-10-15 02:18:20 · 3 answers · asked by Allergic To Eggs 6

guys please help me with these questions

1. what are the consequences of substituting for a blown fuse another

a) with a higher current rating
b)with a lower current rating

2. would accidental contact with a live wire in a mains-operated appliance necessarily be fatal? explain

3a) what would be the current in your body if you touched the terminals of a 12 v battery, if the contact R was 100 000 ohms?

3b) if your skin became wet, and the contact resistance dropped to only 1000 ohms, what would be the current in your body? is this current potentially dangerous? explain.

4. In a powerpoint correctly wired, the switch and fuse are in the 'active' line. if a power point is wired incorrectly with the netrual and active lines connected the wrong way . a toaster with a metal case is plugged into that power point. what is the effect of incorrect wiring

a) will the toaster still work? b) switch? c) if person turns off toaster and uses knife to remove bread. safe?xplain all

2006-10-15 01:54:44 · 2 answers · asked by justine l 1

2006-10-15 01:53:57 · 12 answers · asked by Anonymous

2006-10-15 01:31:18 · 11 answers · asked by gurna 1

in a magnetic field, beta radition to the positive side or alpha to the negative side. I would have thought Beta would have gone further seeing as it is lighter but a book says it's Alpha? Is the book wrong as Ive seen Beta go further in many other books? Many thanks

2006-10-15 00:57:45 · 4 answers · asked by Anonymous

shouldn't you slow down a bit? it is awful fast an if you hit something, you could seriously hurt yourself.

2006-10-14 21:54:05 · 12 answers · asked by ixat02 2

I'm prepping for my A2 Physics practical to be held in 4 days' time. I was wondering what's the simplest way to draw effective arrangements of:

(i) a hall probe (e.g. do i just draw two wires protruding from a cylinder shape - probe - connected in series to a 'datalogger' and in parallel to a power supply? or are more wires needed?)

(ii) double light gates (how many wires do i need? where do they go?)

(iii) Geiger-Muller tube (how many wires needed and what to use to determine count rate)

(iv) platinum resistance thermometer and thermocouple thermometer (how would i draw the shapes of them? are they attached to probes? what are they connected to?)

help with any of the above will be much appreciated!

2006-10-14 21:36:37 · 2 answers · asked by Ray M 1

plz and thx

2006-10-14 21:33:43 · 13 answers · asked by kh2anime 1

2006-10-14 21:33:14 · 4 answers · asked by Anonymous

You throw a rock of weight 21.0 vertically into the air from ground level. You observe that when it is a height 14.9 above the ground, it is traveling at a speed of 25.6 upward.
Part A
Use the work-energy theorem to find its speed just as it left the ground;
Take the free fall acceleration to be = 9.80 .
m/s





Part B
Use the work-energy theorem to find its maximum height.
Take the free fall acceleration to be = 9.80 .

2006-10-14 21:17:18 · 2 answers · asked by googoosh g 1

You are asked to design spring bumpers for the walls of a parking garage. A freely rolling 1300 car moving at 0.600 is to compress the spring no more than 7.40×10−2 before stopping.
What should be the force constant of the spring? Assume that the spring has negligible mass.

2006-10-14 21:15:04 · 1 answers · asked by googoosh g 1

2006-10-14 20:57:51 · 6 answers · asked by lomna 1

2006-10-14 20:56:44 · 4 answers · asked by lomna 1

Can electro magnetic waves (including photons) be sent back in time ?

2006-10-14 20:56:06 · 5 answers · asked by rajesh bhowmick 2