The length of springs a and B is 1 m and 0.5 m, and the stiffness coefficients are 100 N / M and 150 n / m respectively. When they are connected in series and fixed on two columns with a distance of 2 m, the length of springs a and B is 100 N / M and 150 n / m respectively Find the length of a

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• 1. The original length of the spring with stiffness coefficient K is lo. One end of the spring is tied to the vertical axis, and the other end is tied to a small ball with mass m to make uniform circular motion on a smooth horizontal plane When the spring elongation is l, what is the angular velocity of the metal ball rotating around the vertical axis?
• 2. A light spring is used to connect three objects a, B and C of M1, M2 and M3. How big is f when the stiffness coefficients of AB, K1 and BC are just separated from the ground? (1) How big is f when C is just separated from the ground? (2) how high does a rise at this time?
• 3. As shown in the figure, a small ball with gravity g is placed vertically on a smooth ring with radius R. the stiffness coefficient is K and the natural length is l (L)
• 4. As shown in the figure, a small ball with gravity g is placed vertically on a smooth big ring with radius r, and the stiffness coefficient is k, which is self-adjusting As shown in the figure, a small ring B with weight of G is set on a smooth large ring with radius of R placed vertically, a stiffness coefficient of K and a natural length of L (L)
• 5. Horizontal spring stiffness coefficient k = 500N / m, use an external force to push the object block, make the spring compress 10cm and stand still, suddenly remove the external force F, the object block is sprung, then how much work does the spring do to the object block? Can there be a specific process?
• 6. If a spring is compressed for 4cm, a force of 100N is needed to calculate the stiffness coefficient of the spring. If the spring is compressed for 10cm, what is the elastic potential energy of the spring?
• 7. An object a with mass m is hung under the spring with stiffness coefficient K. now a wooden board B with mass of 1 / 3M is used to hold object a, make a move upward, and finally compress the spring If block B is suddenly removed, the instantaneous acceleration of a is a (g)
• 8. If the stiffness coefficients of two spring oscillators are K1 and K2, and a mass of M is hung after they are connected, what is the period of the system
• 9. If the period of a spring vibration is 4S, the period of the acceleration change of the oscillator is___ The period of velocity change is___ .
• 10. Spring array o point in B, C between the amplitude of 10 cm, cycle 1 second, how to find the acceleration of the oscillator at B point! The ratio of the acceleration of the oscillator at point B to the acceleration at point P 4cm from point o!
• 11. As shown in the figure, a and B balls are attached to the lower end of the vertical suspension light spring, and their mass ma = 0.1kg and MB = 0.5kg. When the spring is at rest, its elongation is 15cm. If the thin line between a and B is cut, what is the amplitude and maximum acceleration of a ball in simple harmonic motion?
• 12. As shown in the figure, two objects a and B with mass m are connected by a light spring with stiffness coefficient K. A is lifted in the air by hand with external force F, and B is h above the ground. After letting go, a and B fall, and B does not rebound after colliding with the ground. When the spring force is mg, what is the falling distance of object a?
• 13. As shown in the figure, the mass of object a close to the vertical side is Ma = 0.2kg, and the mass of object B on the horizontal plane is MB = 1kg, As shown in the figure, the mass of the object a on the vertical side is Ma = 0.2kg, and the mass of the object B on the horizontal plane is MB = 1kg. The weight of the rope and the friction between the rope and the pulley are not included. The OB part of the rope is horizontal, and the OA part is vertical. A and B just move at a constant speed together. Take g = 10m / S2, 1) Find the dynamic friction between object B and desktop 2) If horizontal force F is used to pull B to the left, how much tension does it take to make objects a and B move at a uniform speed Don't let me in
• 14. If the elevator stops suddenly, the observer on the ground will see that the ball is in the process of continuing to rise () A. The velocity decreases gradually. B. the velocity increases first and then decreases. C. the acceleration increases gradually. D. the acceleration decreases first and then increases
• 15. There is an object with mass m = 1kg hanging on the spring. Under the following conditions, what is the indication of the spring scale? (g = 10m / S ^ 2) (1) The velocity is 5 m / s (2) At the acceleration of a = 5m / S ^ 2, the vertical acceleration rises (3) The acceleration of a = 5 m / S ^ 2 is used to accelerate the descent (4) The acceleration of gravity g is used to decelerate and rise vertically
• 16. A and B are placed on a smooth horizontal plane and connected by light spring A and B are placed on a smooth horizontal plane and connected by a light spring. Now, the opposite horizontal forces F1 and F2 are applied to a and B respectively, and F1 = 20n and F2 = 10N Spring force If there is only F1, what is the spring force?
• 17. As shown in the figure, on a rough horizontal plane, there are two pieces of wood 1 and 2 with mass M1 and M2 respectively. In the middle, they are connected by a light spring with original length L and stiffness coefficient K. the sliding friction coefficient between the block and the ground is μ. Now, a horizontal force is used to pull the block 2 to the right. When the two blocks move at a constant speed, the distance between the two blocks is () A. L+μkm1gB. L+μk（m1+m2）gC. L+μkm2gD. L+μk（m1m2m1+m2）g
• 18. A small ball fell from the air onto a spring placed vertically on the ground and asked what would happen to the state of the ball How does the acceleration change? How does the speed change? When is the maximum speed? When is the maximum acceleration It starts with the contact spring
• 19. The ball with mass m = 1kg passes through the inclined rod, which forms an angle of θ = 30 ° with the horizontal direction, If the ball is pushed by a horizontal force of F = 20n, it can accelerate the ball to slide up the bar 1. The sliding friction coefficient between the ball and the inclined rod 2. The acceleration of the ball sliding upward along the rod
• 20. Two sliders A and B with mass M1 and M2 are horizontally connected by a light spring and placed on the horizontal table top My answer is C. I think there is a problem My problem stem is the problem in the screenshot, I just don't want to type it out again