Qualification > Sciences
Edexcel PHYSICS Doubts
Romeesa-Chan:
--- Quote from: SZM on March 11, 2012, 03:39:12 pm ---Hello guys,
can u pls tel me how can we indicate the amplitude, wavelength of a LONGITUDINAL and TRANSVERSE wave in a displacement-time graph???
Thanx in advance.
Waitn 4 ur reply asap.
--- End quote ---
Hope it's cleared. :)
Romeesa-Chan:
Please help SZM here asap!!
--- Quote from: SZM on March 11, 2012, 04:57:20 pm ---\To identify the amplitude and wavelength in a displacement-time graph for a longitudinal wave is the same way as how we identify the amplitude and wavelength in a displacement-time graph for a transverse wave. Am i correct dear???
the diagram u r giving is the displacement versus distance and not time/// Are the graph of displacement-time graph and displacement-distance graph same?????
the amplitude of a longitudinal wave is a maximum displacement of any point on the wave from the equilibrium position .--- when they say any point, that means any point in rarefraction as well as compression region?? what do they mean by at any point??
The equilibrium position of a longitudinal wave is at the middle point of a rarefraction and compression area. AM i correct ??
Waitn 4 ur reply asap.
--- End quote ---
astarmathsandphysics:
can anyone help
A 200.0 m long thin wire carries a line charge density l = 361.0 nC/m. Find the absolute value of the
potential difference between points 3.0 m and 6.0 m on a perpendicular radius to the axis of the wire,
provided the perpendicular radius is not near either end of the wire. (The value of
eo = 8.85 x 10-12 C2/N oe m2.)
really tricky question
Will try it in bed tomorrow
SZM:
Hello guys, pls solve my doubtfuls-
1. Is it not a correct answer in terms of PHYSICS, that newton's third law tells us that actions usually have a reaction?? if not pls tel me why along with their reason???
2. if air resistance is neglected, the horizontal velocity component of an arrow fired from a bow stays constant at a non-zero value. If air resistance is not neglected and is acting on the arrow, then the horizontal velocity component of an arrow fired from a bow will increase/decrease with distance travelled????
3. What happens to the velocity of a ball bearing falling from rest through syrup with distance fallen??? My answer is the velocity of the ball bearing will decrease withe distance fallen, becoz the syrup has higher viscosity. Therefore velocity will decrease. But my answer is wrong. the correct answer is it increases from zero to a maximum.How is dat?? explain me in details clearly.
4. If the height above the Moon's surface increases, what happens to the acceleration of a feather falling near to the Moon's surface??? If ur answer is constant, tel me how is dat ?? Why cant the acceleration increases with increasing the height???
5. steel can be classified as a strong materials, because it has a large young modulus value. But the markschemes says it is wrong. the correct answer is , it is because it has a large ultimate tensile stress value. Why my answer is wrong??
6. Modern cars include crumple zones to reduce the size of the impact force. Suggest how the crumpole zones do this????
7. what do u mean by the stiffness??? the type of materials//// am i correct??
8. when unloading the chest expander, it is found that at each extension the restoring force is always less than the loading force. Explain the significance of this, and describe what effect this would have on the rubber cords when performing a large number of repetitions with the expander??? pls explain me in details clearly.
Hope I will get clear explanation for the above doubtfuls. IN SHAA ALLAH.
Thanx in advance. Wasalaam
astarmathsandphysics:
1. Actions always have a reaction. http://theeducationchannel.info/Newtons-Third-Law-for-a-Book-on-a-Table_v1303
2. decreases. Resistance always acts to slow down
3. When ball starts to fall, fluid resistance is zero since it increases with speed, zero at the start. The only force acting is the weight of the ball bearing. As ball speeds up, resistance increases until it is equal to the weight. There is no net force on the ball bearing so acceleration is zero. The ball has reached terminal velocity.
4. Constant acceleration is only an approximation. In fact a=GM/r^2 so as r increases a decreases.
5. large young's modulus means stiff not strong. Strong means ability to withstand stress.
6. crumple zones absorb energy and reduce the magnitude of acceleration. Since F=ma, F is also reduced.
7.stiffness is resistance to stretching when a force is applied.
8.this is hysterisis. Work must be done to expand and compress the expander. With each cycle the expander heats up a little.
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