![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
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___________ .
The first answer is correct. The angular velocity is radian / time (seconds), that is, the radian of turning divided by the time of turning the angle (seconds). According to this calculation, the angular velocity of the minute hand is 2 π / 60 * 60, the angular velocity of the hour hand is 2 π / 12 * 60 * 60, and the angular velocity of the second hand is 2 π / 60
Second: in the uniform circular motion, the linear velocity is equal to the ratio of the arc length (s) through which the moving particle passes and the time (△ T). The arc length of a clockwise turn is 2 π * 1cm, the time is 12 * 3600 seconds, the linear velocity is 2 π * 0.01m/43200 seconds = 4 * 10 ^ - 7 π M / S; the arc length of a minute hand turn is 2 π * 1.5cm, the time is 3600 seconds, The linear velocity is 2 π * 0.015 M / 3600 s = 8.3 * 10 ^ - 6 π M / s, and the angular velocity of the second hand is radian divided by time, i.e. 2 π / 60 = 0.033 π (rad / s)
RELATED INFORMATIONS
- 1. The ratio of the angular velocity of the hour hand, minute hand and second hand
- 2. The ratio of the angular velocity of the hour hand, minute hand and second hand in the clock is______ ．
- 3. 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
- 4. 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?
- 5. In theoretical mechanics, how to judge the direction of angular velocity of a disk rotating clockwise around a fixed axis with uniform angular velocity?
- 6. Direction of angular velocity
- 7. 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?
- 8. What is the direction of angular velocity? Why is it in this direction? RT
- 9. Such as a screw driver, steering wheel and so on, there is a wheel fixed on the shaft can be turned called————
- 10. What is the formula? What is the unit? Write about it R / s and rad / s are the same thing?
- 11. 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
- 12. How to calculate angular velocity
- 13. The angular velocity of the earth's surface is the same at any place except the north and south poles. But why is the perihelion and the aphelion?
- 14. What is the direction of angular velocity What's the direction of angular velocity
- 15. The tape axis of the tape recorder rotates at a constant angular speed to rewind the tape. After rewinding, the end radius of the tape is three times the radius of the empty axis. The winding time is t, What's the difference between thick and thin tapes
- 16. The maximum decrease of the equator to the two poles, what is the angular velocity? Is it equal in all parts of the earth? Or what?
- 17. What is the rotational speed of the coil in alternating current and what is the relationship between it and angular velocity
- 18. When the speed of generator is 300 R / min, what is the angular velocity W and the period T?
- 19. The motor speed of household food grinder is 1000r / min___ r/s,
- 20. The rotational speed of the motor pulley is n = 120r / min. the distance between a point on the pulley and the axle is 10cm. Calculate the rotational frequency, periodic angular velocity and linear velocity of this point?