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Mechanics | Relativity
Two forces are of magnitude of 450N and 240N respectively. Detrmine the resultant force when the forces act at right angles to each other.
Mechanics | Relativity
when a force is applied at one end of an elastic wire it produce a strain e in the wire . if the y is the young modulus of the material of the wire what is the amount of energy stored per unit volume of the wire
Mechanics | Relativity
C) You have a 2.0 kg block that moves on a linear path on a horizontal surface.
The block is initially moving to the right. The coefficient of kinetic friction
between the block and the path is μk. Attached to the block is a horizontally
mounted massless string as shown in the figure below. The block includes an
accelerometer which records acceleration vs. time. As you increase the tension
in the rope the block experiences an increasingly positive acceleration. At some
point in time the rope snaps and then the block slides to a stop (at a time of 10
seconds). Gravity, with g = 10. m/s2, acts downward.
@t=0, a=1
@t=4, a=5 & -2
@t=10, a=-2 & 0
1) At what time does the string break?
2) What speed did the block have when the string broke?
3) What is the value of µk?
4) Using µk above, what was the tension in the string at t = 2.0 seconds?
The block is initially moving to the right. The coefficient of kinetic friction
between the block and the path is μk. Attached to the block is a horizontally
mounted massless string as shown in the figure below. The block includes an
accelerometer which records acceleration vs. time. As you increase the tension
in the rope the block experiences an increasingly positive acceleration. At some
point in time the rope snaps and then the block slides to a stop (at a time of 10
seconds). Gravity, with g = 10. m/s2, acts downward.
@t=0, a=1
@t=4, a=5 & -2
@t=10, a=-2 & 0
1) At what time does the string break?
2) What speed did the block have when the string broke?
3) What is the value of µk?
4) Using µk above, what was the tension in the string at t = 2.0 seconds?
Mechanics | Relativity
A) A 6.0 kg mass sits atop a larger 9.0 kg mass which itself sits on a horizontal table top. A third, 3.0 kg mass hangs vertically just barely touching the right face of the large mass. A massless inflexible string connects the hanging mass to the top mass passing over a frictionless pulley (P). All horizontal surfaces have coefficients of static and kinetic friction of 0.80 and 0.40 respectively. All vertical surfaces are frictionless.
There is a little tap directly down on the hanging mass, just enough to cause this
block to slide. Assume this motion applies to parts 3, 4 and 5.
3) The 9.0 kg mass does not move. What is the acceleration of m2; tension now
in the string?
4) What is the magnitude of the net horizontal force on the pulley? What is the
magnitude of net force on the support rod (S) by the pulley?
5) What is the magnitude and direction of the total friction force on the large
mass, if any, at the interface between the table top and this mass?
There is a little tap directly down on the hanging mass, just enough to cause this
block to slide. Assume this motion applies to parts 3, 4 and 5.
3) The 9.0 kg mass does not move. What is the acceleration of m2; tension now
in the string?
4) What is the magnitude of the net horizontal force on the pulley? What is the
magnitude of net force on the support rod (S) by the pulley?
5) What is the magnitude and direction of the total friction force on the large
mass, if any, at the interface between the table top and this mass?
Mechanics | Relativity
B) A 3.0 kg block sits atop a 10.0 kg block and, initially, both are at rest. There is friction at the interface between the two blocks and the coefficients of static and kinetic friction are 0.60 and 0.50 respectively (but no friction anywhere else). The top block is anchored to the left wall by a horizontal, massless & inflexible rope. There is a tension force, TR, (to the right) applied by another horizontal rope attached to the bottom block. Gravity, with g = 10 m/s2, acts in the vertical direction.
1) If the tension in the right rope is 10 N, what is the tension in the left rope?
2) With respect to part A, what is the friction force by the top block on the
bottom block?
3) What tension in the right rope would the bottom block move?
4) Now the tension in the right rope is increased to 20 N. What is the tension
in the left rope?
5) With respect to part C, what is the friction force by the top block on the
bottom block?
6) What is the resulting acceleration of the bottom block?
1) If the tension in the right rope is 10 N, what is the tension in the left rope?
2) With respect to part A, what is the friction force by the top block on the
bottom block?
3) What tension in the right rope would the bottom block move?
4) Now the tension in the right rope is increased to 20 N. What is the tension
in the left rope?
5) With respect to part C, what is the friction force by the top block on the
bottom block?
6) What is the resulting acceleration of the bottom block?
Mechanics | Relativity
A particle of rest mass m0 has a speed v= 0.8c. Find its relativistic momentum, its kinetic energy and total energy
Mechanics | Relativity
In a solid, the speed of elastic longitudinal wave is 1.35ms -1. If the Young’s modulus of
elasticity of the solid is 2X1011 N m-2 calculate its mass density.
elasticity of the solid is 2X1011 N m-2 calculate its mass density.
Mechanics | Relativity
If on increasing the speed of a vehicle by 2m/s, the kinetic energy gets doubled, then what would be its initial speed?
Mechanics | Relativity
A 2500-kg truck traveling at 40 km/h strikes a brick wall and comes to a stop in 0.2 s. (a)
What is the change in momentum? (b) What is the impulse? (c) What is the average
force on the wall during the crash?
What is the change in momentum? (b) What is the impulse? (c) What is the average
force on the wall during the crash?
Mechanics | Relativity
in summer there is lightning as well as thunderstorm, but this does not happen in winter. why?
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#339914 on Dec 2023
#339914 on Dec 2023