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)

(1) : because G

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1. 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
2. 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___ .
3. 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!
4. The period of a spring oscillator which vibrates in the vertical direction is t The period of a spring oscillator vibrating in the vertical direction is t. when the oscillator moves upward from the equilibrium position o, another small ball on the same horizontal line with the equilibrium position o just starts to throw upward at the speed vo. When VO is large, the oscillator and the small ball pass through the equilibrium position at the same time?
5. A small ball with mass m is hung on the f end of the spring with stiffness coefficient r, and then the small ball is pulled down with force to make the spring elastic?
6. When a car runs at a constant speed on a straight road, does the goods in the car suffer friction
7. The direction of friction on the front and rear wheels is () (A) The friction of the front and rear wheels are backward, (b) the friction of the front and rear wheels are forward, (c) the friction of the front wheel is backward and the friction of the rear wheel is forward, (d) the friction of the front wheel is forward and the friction of the rear wheel is backward
8. Traction and friction? Isn't the traction of a car expressed as the friction between the ground and the car? And the friction is not only determined by the roughness and pressure? Is the heavier the car, the greater the traction? How to understand the relationship between traction and friction? I still don't quite understand, such as the same car. No matter what kind of engine is changed, the initial traction is the same, but the rated power is increased?
9. When a car turns off the engine and rushes up a slope, the direction of friction between the slope and the car will change xiexiele
10. The automobile engine is connected with the rear wheel through the transmission. When the automobile moves forward from standstill, the direction of friction between the front wheel and the rear wheel is () A. The friction of the front wheel is forward, the friction of the rear wheel is backward B. the friction of the front wheel is backward, the friction of the rear wheel is forward C. the friction of the front and rear wheels are backward D. the friction of the front and rear wheels are forward
11. 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?
12. 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?
13. 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)
14. 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)
15. 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?
16. 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?
17. 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
18. 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?
19. 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?
20. 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