Is the volcano in Yellowstone Park the largest on earth

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• 1. How long will Huangshi volcano, the largest volcano in the world, erupt? What are the consequences?
• 2. As shown in Figure 1 on the right, the wooden block ejected by the spring from the bottom of the inclined plane suffers (regardless of air resistance) during sliding out along the smooth inclined plane
• 3. A slider is ejected by a compression spring fixed at the bottom of the smooth slope. Assuming that the smooth slope is infinitely long, the slider will always slope upward evenly Fast linear motion or will it slide down after a while? Why?
• 4. Assuming that the inclined plane is smooth and the air resistance is not considered, the reason for the change of the movement state of baseball is that
• 5. As shown in the figure, the fixed smooth surface in the elevator has an inclination angle of 30 ° and the lower end of the spring on the inclined surface is connected with a wood block with a mass of M = 4kg. When the elevator descends at an acceleration of 2m / S ^ 2, the elevator will be able to move forward seek Spring force Write the support of the face to the block
• 6. As shown in the figure, on the smooth slope with an inclination angle of θ = 30 °, there are two wooden blocks a and B connected by light springs. It is known that the mass of a is 2kg, and the mass of B is 3kg. There is a constant force F = 50nd acting on A. at the moment when AB has the same acceleration, remove the external force F. what are the accelerations of a and B at this moment?
• 7. As shown in the figure, a small ball is tied with a string to make it move in a uniform circular motion in a horizontal plane, regardless of air resistance A. Only by gravity B. only by tension C. by gravity, tension and centripetal force D. by gravity and tension
• 8. The small ball with mass m falls from a standstill at the height h from the mud pond, regardless of the air resistance 15. The small ball with mass m falls from a static position at the height h from the mud pool, and it falls on the mud pool and then goes deep into the mud pool without considering the air resistance. As shown in the figure, what is the average resistance of the small ball moving in the mud pool? The small ball with mass m falls from a standstill at the height h from the mud pool, and it falls on the mud pool and then goes deep into the mud pool for h without considering the air resistance. As shown in the figure, how much is the average resistance of the small ball moving in the mud pool?
• 9. When a small ball falls from the height h above the ground, the air resistance of the ball in the process of movement is k times of its gravity. When the ball collides with the ground, it can rebound at the same speed. Then the total distance of the ball from release to stop bouncing is______ ．
• 10. As shown in the figure, the ball is released from rest at the left end. In the process of swinging from left to right, regardless of air resistance, then () A. In the process of moving from the highest point to the lowest point, part of the gravitational potential energy is converted into kinetic energy B. in the process of moving from the lowest point to the highest point, part of the kinetic energy is converted into gravitational potential energy C. the height of the highest point on the left is greater than that of the highest point on the right D. the height of the highest point on the left is equal to that of the highest point on the right
• 11. A. The mass of two blocks B is Ma, MB and 2mA = MB respectively. The two blocks are connected by a light spring and then rest on a smooth horizontal table. If the spring is compressed by external force, and then the external force is removed, the kinetic energy ratio Eka / EKB of the two blocks is calculated
• 12. As shown in the figure, the wood block a & nbsp; and B & nbsp; are connected by a light spring and placed vertically on the wood block C & nbsp; with their mass ratio of 1:2:3. Suppose that all the contact surfaces are smooth, and the acceleration of the wood block a & nbsp; and B & nbsp; is & nbsp; () A. aA=0B. aA=gC. aB=3gD. aB=32g
• 13. 420 ml is equal to a few parts of a liter
• 14. If the solution of the system of inequalities 9m + 1 is x > 2, then the value range of M is
• 15. 45, 35, 42, 37, 45, 38, 45 median and mode
• 16. Solve the equation and find the value of the unknown X. 3x / 4 = 3x / 8, 2 / 3 △ x = 1 / 6 X ÷ (1 + 1 / 5) = 6 x 4 / 1 × 9 / 7 = 7 / 12, don't wait directly,
• 17. A simple method is used to calculate. 4 of 9 + 1 of 16 + 15 of 16 + 5 of 9, 30 of 21-9 of 20 A simple method is used to calculate. 4 / 9 + 1 / 16 + 15 / 16 + 5 / 9, 30 / 21-20 / 9-20 / 11
• 18. 5x is less than 7X-2, 8x is more than 13x-5, 20x-19 is more than 18x-9, 3x is more than 4x-1
• 19. What is the split term method, for example: how to calculate 1 / 3 + 1 / 15 + 1 / 35 + 1 / 63 + 1 / 99?
• 20. Find the extremum (1) 5x-3x ^ 2 (2) 2x ^ 2 + x-3 (3) 1 / (x ^ 2 + X + 1) (4) x ^ 2 + 4 / x ^ 2 of the following formula. Thank you very much