Such as a screw driver, steering wheel and so on, there is a wheel fixed on the shaft can be turned called————

-----Axle

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1. What is the formula? What is the unit? Write about it R / s and rad / s are the same thing?
2. How does the period of centripetal acceleration and centripetal force change? Does it increase or decrease It's better to have a process The ignorance of random answers (⊙ o ⊙)
3. When the linear velocity is V, the radius of the circle is R. if the centripetal force remains unchanged, when the radius of the circle is 2R, the angular velocity should be () A. v2RB. 2v2RC. vRD. 2vR
4. A pair of stars a and B make a uniform circular motion around a point on their line. Its cycle is t, the distance between a and B is l, and the ratio of their linear velocity V1 / V2 = 2, Find the mass of the two stars
5. If the distance between two stars remains unchanged and the matter of one star is transferred to another, how can the period and linear velocity change
6. When a man-made satellite makes a circular motion around the earth and its orbit gradually increases, how does its period, angular velocity, linear velocity, centripetal force and universal gravitation change Such as the title
7. The ratio of the orbit radius of two satellites in uniform circular motion is 1:2 Please tell me the answer and the process of solving the problem! Thank you!
8. The operation period of a near earth satellite is about 84 minutes. What are the angular velocity and linear velocity around the earth The radius of the earth is 6.4 * 10 ^ 6m
9. Are the linear velocities of satellites equal? What's the relationship between period and radius?
10. The higher the altitude of an artificial earth satellite, the higher the () A. The greater the linear velocity is, the greater the period is, the greater the angular velocity is, and the greater the centripetal acceleration is
11. What is the direction of angular velocity? Why is it in this direction? RT
12. How to understand that the direction of moment, angular velocity and angular acceleration is along the axis when a rigid body rotates? Why is the moment generated by a tangent force acting on a rigid body perpendicular to the plane and along the axis?
13. Direction of angular velocity
14. In theoretical mechanics, how to judge the direction of angular velocity of a disk rotating clockwise around a fixed axis with uniform angular velocity?
15. The hour hand and minute hand of a mechanical watch can be regarded as rotating at a constant speed. How long does it take for the hour hand and minute hand to coincide from the first time to the second time?
16. If the length ratio of the hour hand, minute hand and second hand of the clock is 1:1.5:2, the ratio of the angular velocity at the end of the hour hand, minute hand and second hand to the linear velocity is
17. The ratio of the angular velocity of the hour hand, minute hand and second hand in the clock is______ ．
18. The ratio of the angular velocity of the hour hand, minute hand and second hand
19. What is the relationship between the angular velocity of the hour hand, minute hand and second hand on a watch A: the ratio of the angular velocity of minute hand and hour hand is 1:60 The ratio of the angular velocity of the minute hand to the hour hand is 1:12 C the ratio of the angular velocity of the second hand to the minute hand is 1:12 D the ratio of angular velocity of second hand to minute hand is 1:60 The answer is B, D How do I figure it out? It's 60:1 2) For a famous brand watch, the length of the hour hand is 1cm, and the length of the minute hand is 1.5cm. The movement of the hour hand and minute hand can be regarded as uniform circular movement, and the linear velocity of the needle tip of the hour hand is 1.5cm__________ The linear velocity of minute needle tip is___________ The angular velocity of the second hand is___________ .
20. The horizontal turntable with a mass of 200g and a radius of 15cm rotates at an angular velocity of 5rad / s. a worm with a mass of 20g falls on the center of the turntable and crawls outward along the radial direction. The angular velocity of the turntable when the worm climbs to the edge of the turntable is calculated