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A uniform meter stick is in static rotational equilibrium when a mass of 220g is suspended from the 5.0-cm mark, a mass of 120g is suspended from the 90-cm mark, and the support stand is placed at the 40-cm mark. What is the mass of the meter stick?
A ball is thrown straight upward and reaches the top of its path in 1.71 s (before it starts to come back down). A second ball is thrown at an angle of 38.2 degrees with the horizontal. At what speed must the second ball be thrown so that it rea..
It takes sound waves of frequency 500 Hz 14.7 ms to make a round trip through a hollow pipe of length 7.5 m filled with helium. What is the speed of sound in helium
Consider a reactor where the intake water is at 18degrees C. State regulations limit the temperature of the output water to 30degreesC so as not to harm aquatic organisms.How many liters of cooling water have to be pumped
A pendulum is made out of a ( 251.3+-0.1)g mass and a string that is (1.3+-0.005)m long. If the mass has a speed of (1.3+-0.1)m/s, Calculate the tension of the string and its uncertainty
A cart carrying a vertical missile launcher moves horizontally at the constant velocity of 30.1 to the right. It launches a rocket vertically upward. The missile has an initial vertical velocity of 40.33 relative to the cart.
A simple dc-motor is made up of a single coil rotor placed between two permanent magnets. How many turns should the coil have so that the motor can supply a torque of 0.100 N-m
At a factory, a noon whistle is sounding with a frequency of 491 Hz. As a car travelling at 78 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory, the driver hears frequency ff. What is the chang..
A 30.0-N stone is dropped from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it falls
A 547-kg satellite is in a circular orbit about Earth at a height above Earth equal to Earth's mean radius. Find the gravitational force acting on it
When a current of 2.0A flows in the 100-turn primary of an ideal transformer, this causes 14 A to flow in the secondary. How many turns are in the secondary
A rock climber throws a small first aid kit to another climber who is higher up the mountain. What is the vertical height between the two climbers
A machine shop grinding wheel accelerates from rest with a constant angular acceleration of 2.8rad/s2 for 7.6s, Find the total number of revolutions turned
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