Dissolve two shot with radius of 3M and 5m to make a bigger shot. What is the radius of the big shot (accurate to 0.1cm)?

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• 1. When an athlete puts a shot, it is 5 / 3M above the ground at the first time of putting the shot. The landing point of the shot is 10m away from the corresponding point on the ground at the first time of putting the shot. The highest point of the shot is 3M above the ground. It is known that the route of the shot is a parabola. The analytical formula of the parabola can't be solved
• 2. (Physics of senior two) an object is thrown horizontally at the speed of 3m / s, and the landing speed is 5m / s. The flight time and displacement of the object are calculated
• 3. A small ball with a mass of 1 kg is thrown horizontally at an initial speed of 3 M / s, and the landing speed is 5 m / s, regardless of the resistance, g = 10 m / S ^ (1) How high is the throw point from the ground? (2) What is the instantaneous power of gravity when the ball is about to land?
• 4. When an object moving in a straight line with uniform acceleration passes through points a, B and C in turn, it is known that ab = BC, and the average velocities of AB and BC sections are V1 = 3m / s and V2 = 6m / s respectively (1) What are the instantaneous velocities VA, VB and VC of an object passing through points a, B and C? Why can't we use the simultaneous formula (VA + VB) / 2 = 3, (VB + VC) / 2 = 6, (VA + VC) / 2 = VB to calculate VB equal to 4.5? Please tell me why it's not right to do so
• 5. When an object moving in a straight line with uniform acceleration passes through points a, B and C in turn, the displacement XAB = XBC. It is known that the average velocity of the object in AB section is 3m / s, and that in BC section is 6m / s, then the instantaneous velocity of the object at point B is () A. 4 m/sB. 4.5 m/sC. 5 m/sD. 5.5 m/s
• 6. The object to be uniformly added passes through three points A.B.C in turn, XAB = XBC. It is known that the average velocity of the object in AB section is 3m / s, and that in BC section is 6m / s. The average velocity of the object at B point is 3m / s
• 7. When an object is moving in a straight line with uniform acceleration, the average speed of the first half of the displacement is 3m / s, and the average speed of the second half is 6m / s, what is the speed when it passes through the middle position?
• 8. When an object is moving in a straight line with uniform acceleration, the average speed of the first half of the displacement is 3m / s, and the average speed of the second half is 6m / s, what is the speed when it passes through the middle position?
• 9. The average speed of the first half displacement is 3m / s, the average speed of the second half displacement is 6m / s, what is the average speed of the whole process How to calculate 4m / S? Why not 4.5m/s?
• 10. When an object moves eastward along a straight line, the average velocity of the first half displacement is 3m / s, and the average velocity of the second half displacement is 2m / s, then the average velocity of the whole displacement is () A. 2.5 m/sB. 1.2 m/sC. 2.4 m/sD. 2.3 m/s
• 11. A small ball is thrown horizontally at the speed of 3m / s, and its landing speed is 5m / s. The time and displacement of the ball in the air are calculated
• 12. When an object is thrown horizontally from a certain height, the initial velocity is 3m / s, the landing velocity is 5m / s, and the air resistance is not considered
• 13. The same object moves at the speed of V1 for the first time and V2 for the second time on the same plane (V1 > V2). Why is the pulling force the same when the moving speed is different?
• 14. Two small balls are fixed at both ends of a rod with length L, and make a circular motion around a point o on the rod. The speed of small ball 1 is V1, and the speed of small ball 2 is v2. Calculate the distance from O to 2
• 15. River width d = 100m, water speed V1 = 5m / s, ship speed V2 = 3m / s in still water, the shortest voyage of the ship across the river, the shortest voyage way to cross the river time
• 16. A wooden raft drifts along the river. When the wooden raft passes through a wharf, a motorboat just goes down the wharf to the village 15km away from the wharf. After 0.75h, it arrives at the village and returns immediately. Then it meets the wooden raft 9km away from the village to calculate the flow rate of the river and the speed of the boat in still water
• 17. There is a high-speed camera to take a picture of the moment when the bullet penetrates the apple. After zooming in, it is found that the distance between the front and back of the bullet image is about 1% - 2% of the length of the bullet in the exposure time. It is known that the flight speed of the bullet is about 500m / s, so it can be estimated that the exposure time of this picture is the closest () A) 10's negative third second B) 10's negative sixth second C) 10's negative ninth second D) 10's negative twelfth second Although this problem is completely solved, I can't understand the answer, so please do it and explain it yourself Where did the bullet come from when it was five centimeters long?
• 18. Description of the speed of movement The X -- t images of three objects moving in a straight line are compared 1. Displacement size:---- 2. Distance:---- 3. Average speed:-----
• 19. Physics in grade one of senior high school: description of speed of motion -- speed The average velocity of an object passing through two consecutive equal displacements is V1 and V2 respectively, and the average velocity in the whole process is v = 12m / s. given V1 = 10m / s, the size of V2 can be calculated Give the operation process, thank you!
• 20. Description of the speed of the movement ----- speed] requires detailed steps! 1. A particle is on the x-axis and always moves in the positive direction of the x-axis. The position coordinates of each moment are shown in the table below t/s 0 2 4 6 8 10 12 14 16 18 x/m 2 4 6 8 8 8 12 16 20 24 (1) What is the displacement and distance of the particle in the first 10 seconds? (2) What is the instantaneous velocity of the particle at the end of 8s? (3) What is the average velocity of a particle between 0 and 18 seconds? 2. The speed of signal transmission along animal nerve is about 100 m / s. how long does it take for a 30 m whale to feel a bite from a shark on its tail? How long does it take for a 8 m whale to feel a bite from a mosquito on its foot?