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A 400-kg motor supported by four springs, each of constant Review Problems 150 kN/m, is constrained to move vertically. Knowing that the unbalance of the rotor is equivalent to a 23-g mass located at a distance of 100 mm from the axis of rotation, determine for a speed of 800 rpm
(a) the amplitude of the fluctuating force transmitted to the foundation,
(b) the amplitude of the vertical motion of the motor.
You operate a small grain elevator near Champaign, Illinois. One of your silos uses a bucket elevator that carries a full load of 800 kg through a vertical distance of 40 m. (A bucket elevator works with a continuous belt, like a conveyor belt.)
A copper wire has a length of 50 meters and diameter of 1.6 mm. Copper has a resistivity of 1.68 x 10^-8 ohm. Calculate the resistance of the wire
Susie Maroney from Australia set a women's record in long-distance swimming by swimming 93.625 km in 24 h. If she had a mass of 55 kg, how much kinetic energy did she have
an electric circular saw is designed to reach its final angular speed starting from rest in 1.40 s. its average angular
The block of mass mB hangs freely. The coefficient of static friction between mA and the surface is 0.40. The blocks are at rest. where m1 = mA and m2 = mB. Draw the free body diagram of the blocks.
A wheel (mass = 7.54 kg, radius = 16.8 cm) rolls, without slipping, down the side of a hill. How much energy does the wheel lose to friction
A pendulum with a mass of 1kg. on a light string 1 meter long is dropped from a position with the string held level falling until it as its lowest point. What is the velocity of the bullet
because of its chemical similarity to calcium 9038 sr can collect in the bones and present a health risk. what
Light of a wavelength of 661.1 nm is received from a star that is emitting light of wavelength of 659.6 nm. How fast is the star moving relative to the earth
An air-core solenoid with 80 turns is 10.64 cm long and has a diameter of 1.09 cm. How much energy is stored in its magnetic field when it carries a current of 0.44 A
An electron with unknown kinetic energy is brought to rest as it falls during a potential 120 V. What was its initial kinetic energy? (In joules)
Three moles of nitrogen gas,N2, at 31.0°C arecontained in a 19.5 L cylinder. Find the pressure the gas exerts on the cylinder walls
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