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Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocityhas a radius of 1.9x10-8m, and a tangential speed at therim of 2.9x10-5 m/s. (a) What is the angular speed (the magnitude of the angular velocity) of this bacterial motor? (b) How long does it take themotor to make one revolution?
The steel E string of a violin is under a tension of 46.0 N. The diameter of the string is 0.170 mm and the length under tension is 35.0 cm. Find the unstretched length of this string and the work needed to stretch the string. (Give your answers with..
The initial speed of a cannon ball is 0.20 km/s. what is the minimum time of flight for the ball
A 3800kg truck is parked on a 12 degree slope. How big is the friction force on the truck
The coefficients of static and kinetic friction are 0.2 and 0.1 respectively. What is the minimum magnitude of the force F, parallel to the plane, that will prevent the block from slipping
A plastic rod that has been charged to 19touches a metal sphere. Afterward, the rod's charge is 3.0. How many charged particles were transferred
The nucleus of radioactive polonium-210, with a mass of about 3.49?10?25kg , is known to decay by emitting an alpha particle with a mass of about 6.68?10?27kg. what is the recoil speed of the remaining nucleus
A comet orbits the Sun with a period of 83.77 years. The comet's distance of closest approach to the Sun (perihelion) is 1.087 AU. What is the maximum distance of the comet from the Sun
A double-slit interference pattern is created by two narrow slits spaced 0.21mm apart. What is the wavelength of the light used in this experiment
A doubly charged helium atom whose mass is 6.6 ×10?27kg is accelerated by a voltage of 2700V, What is its period of revolution
A 1.65 kg mass is placed on the end of a spring that has a spring constant of 195 n/m. find the change in elastic potential energy of the system
The sound travels through the left tube LXM, which has a fixed length. Concurrently, the sound travels through the right tube LYM, length of which can be changed by moving the sliding section
A football is kicked straight up into the air; it hits the ground 3.4s later. What was the greatest height reached by the ball? With what speed did it leave the kicker's foot
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