The motor speed of household food grinder is 1000r / min___ r/s,

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• 1. When the speed of generator is 300 R / min, what is the angular velocity W and the period T?
• 2. What is the rotational speed of the coil in alternating current and what is the relationship between it and angular velocity
• 3. 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?
• 4. 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
• 5. What is the direction of angular velocity What's the direction of angular velocity
• 6. 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?
• 7. How to calculate angular velocity
• 8. 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
• 9. 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___________ .
• 10. The ratio of the angular velocity of the hour hand, minute hand and second hand
• 11. 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?
• 12. If the speed of a motor is 1200R / min, the rotation period is___ s. The angular velocity is___ Rad / s, the radius from point a to the center of the circle is 0.5m, then the line of point a The speed is____ m/s
• 13. The rated speed of a three-phase asynchronous motor is 1440r / min. what is the synchronous speed of the motor? What is the speed of the rotor rotating magnetic field relative to the rotor?
• 14. In the problem of celestial bodies, if the orbit radius increases, only the period will increase and the others (centripetal acceleration, angular velocity) will decrease Why?
• 15. The relationship between linear velocity, angular velocity, period, acceleration of gravity and radius R is deduced formula
• 16. The law of universal gravitation to find the acceleration of gravity around the celestial body
• 17. If the radius of a celestial body is k times that of the earth and its density is p times that of the earth, then the gravitational acceleration on the surface of the celestial body is () A. KP2 times B. KP & nbsp; times C. KP times D. p2k times
• 18. How does the period and angular velocity of the planet change with the distance from the central celestial body?
• 19. The relationship between angular acceleration and angular velocity?
• 20. Angular velocity of the earth