Initially a 4kg mass and a 2kg mass are at rest on a friction free surface...
Initially a 4kg mass and a 2kg mass are at rest on a friction free surface held together by a string.
Between these two masses is a spring compressed by 0.1 m. At t= 0 , the string is cut and the two masses allowed to fly apart. When the masses are far apart, the velocity of the 2kg mass is 2m/s.
1) What is the velocity of the 4kg mass??
2) Is momentum conserved in this process, i.e is the total momentum of the two masses the same before and after the string is cut??
3)Is energy conserved in this process, i.e is the total energy of the two masses and spring system the same before and after the string is cut??
Homework Answers
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Initially a 4kg mass and a 2kg mass are at rest on a friction
free surface...
A 4kg mass sits on a surface with a coefficient of friction of 0.47. The spring...
A 4kg mass sits on a surface with a coefficient of
friction of 0.47. The spring (spring constant = 140 N/m) is
compressed a distance of 0.62m from its unstretched position and
released. What is the velocity of the mass when the spring reaches
its unstretched position?
4 kg k
withinitial Q3-(25 pts) A block of mass m is attached to an ideal spring with rest...
withinitial Q3-(25 pts) A block of mass m is attached to an ideal spring with rest (equilibrium) length L and spring constant k on the x axis. The other end of the spring is fixed to a wall. Initially, the spring is compressed by an amount L/2 and another block of mass 2m is placed in front of the first block (they are not attached). The system is released at t 0 from rest. Ignore friction and the sizes of...
Final Conditions <ius n ( ( o "Un 3m/s lkg 8m/s Momentum of 4kg mass- Momentum...
Final Conditions <ius n ( ( o "Un 3m/s lkg 8m/s Momentum of 4kg mass- Momentum of 1kg mass - Total Momentum after= Kinetic energy of 4kg mass - Kinetic energy of 1 kg mass = Total kinetic energy after = Was total momentum conserved in this collision? (yes or no) Was total kinetic energy conserved in this collision? (yes or no)
5. Hockey pucks A and B have masses mA 2kg and mB -4kg and slide towards each other on ice. The ice is very smooth so friction is negligible. Below is a top view of the system before the hockey pucks...
5. Hockey pucks A and B have masses mA 2kg and mB -4kg and slide towards each other on ice. The ice is very smooth so friction is negligible. Below is a top view of the system before the hockey pucks collide: 0 i.B ● m13 a) A initially slides horizontally to the right with a speed of 15m/s and B initially slides with a speed of 5m/s at an angle θ 36.87 as shown above. If the pucks stick...
Q3-(25 pts) A block of mass m is attached to an ideal spring with rest (equilibrium)...
Q3-(25 pts) A block of mass m is attached to an ideal spring with rest (equilibrium) length L and spring constant k on the x axis. m other end of the spring is fixed to a wall Initially, the spring is compressed by an amount L/2 and another block of mass 2m is placed in front of the first block (they are not attached). The system is released at t 0 from rest. Ignore friction and the sizes of the...
3. Two blocks of masses m and 3m are placed on a frictionless horizontal surface. A light spring is attached to the mor...
3. Two blocks of masses m and 3m are placed on a frictionless horizontal surface. A light spring is attached to the more massive block, and the blocks are pushed together and connected with a cord. The spring has a spring constant k, and while the blocks are pushed together, the spring is compressed over a distance d. At a moment in time t-0, the cord is cut, the spring expunds, and the blocks are sliding away from each other....
Two blocks, A and B, are initially held together by a string as shown in the...
Two blocks, A and B, are initially held together by a string as
shown in the figure; the mass of block A is of 2 kg and the mass of
block B is 4 kg. The massless spring in-between the two blocks has
a spring constant of k = 655 N/m and is initially compressed by 45
cm. The two blocks are initially moving together with a speed of 1
m/s. When the string is cut (i.e., when the blocks...
A 0.01kg bullet is fired horizontally into a 1 kg block of wood, initially at rest...
A 0.01kg bullet is fired horizontally into a 1 kg block of wood, initially at rest on a frictionless surface. After the impact, the block of wood with the bullet inside recoils with a velocity of 2m/s. 1. Is momentum conserved in this process?? 2.Is energy conserved in this process? 3. What was the velocity of the bullet before impact with the block of wood?
4.) A light horizontal spring (k=4000 N/m) is compressed 10 centimeters from its relaxed state by...
4.) A light horizontal spring (k=4000 N/m) is compressed 10 centimeters from its relaxed state by a 3 kg mass on the left, and a 5 kg mass on the right, which are initially at rest. The spring then is allowed to relax, pushing the masses apart. A.) Calculate the final total kinetic energy of this system (i.e. both masses). (20 J) B.) Determine the final velocity of each mass when the spring relaxes. Assume friction is negligible.
Physics Q. A block of mass 4kg is at rest on a level frictionless surface. A...
Physics Q. A block of mass 4kg is at rest on a level frictionless surface. A second block, of mass 9kg slides in to it with a speed of 15m/s and the two stick together. They slide up a slope until they come to rest. How high (in meters) off the level surface do the two reach before sliding back? please explain how you solved for this so that I could learn.
A 4kg mass sits on a surface with a coefficient of
friction of 0.47. The spring (spring constant = 140 N/m) is
compressed a distance of 0.62m from its unstretched position and
released. What is the velocity of the mass when the spring reaches
its unstretched position?
4 kg k
withinitial Q3-(25 pts) A block of mass m is attached to an ideal spring with rest (equilibrium) length L and spring constant k on the x axis. The other end of the spring is fixed to a wall. Initially, the spring is compressed by an amount L/2 and another block of mass 2m is placed in front of the first block (they are not attached). The system is released at t 0 from rest. Ignore friction and the sizes of...
Final Conditions <ius n ( ( o "Un 3m/s lkg 8m/s Momentum of 4kg mass- Momentum of 1kg mass - Total Momentum after= Kinetic energy of 4kg mass - Kinetic energy of 1 kg mass = Total kinetic energy after = Was total momentum conserved in this collision? (yes or no) Was total kinetic energy conserved in this collision? (yes or no)
5. Hockey pucks A and B have masses mA 2kg and mB -4kg and slide towards each other on ice. The ice is very smooth so friction is negligible. Below is a top view of the system before the hockey pucks collide: 0 i.B ● m13 a) A initially slides horizontally to the right with a speed of 15m/s and B initially slides with a speed of 5m/s at an angle θ 36.87 as shown above. If the pucks stick...
Q3-(25 pts) A block of mass m is attached to an ideal spring with rest (equilibrium) length L and spring constant k on the x axis. m other end of the spring is fixed to a wall Initially, the spring is compressed by an amount L/2 and another block of mass 2m is placed in front of the first block (they are not attached). The system is released at t 0 from rest. Ignore friction and the sizes of the...
3. Two blocks of masses m and 3m are placed on a frictionless horizontal surface. A light spring is attached to the more massive block, and the blocks are pushed together and connected with a cord. The spring has a spring constant k, and while the blocks are pushed together, the spring is compressed over a distance d. At a moment in time t-0, the cord is cut, the spring expunds, and the blocks are sliding away from each other....
Two blocks, A and B, are initially held together by a string as
shown in the figure; the mass of block A is of 2 kg and the mass of
block B is 4 kg. The massless spring in-between the two blocks has
a spring constant of k = 655 N/m and is initially compressed by 45
cm. The two blocks are initially moving together with a speed of 1
m/s. When the string is cut (i.e., when the blocks...
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