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a) A thin, uniform rod has a length of 0.30m, mass of 0.15kg, and is attached by a hinge at the point P. A uniform magnetic field B = 0.55T is directed perpendicular to the plane of the rod. A current of I=3.6A flows through the rod causing the rod to remain in mechanical equilibrium at the angle above the horizontal. Find the angle.
b) The coil of a dc motor contains 550 turns and has an area per turn of .012m2. The magnetic field is .049T and the current in the coil is 0.1A. A brake shoe is pressed perpendicularly against the shaft to keep the coil just from turning. The normal force acting through the shoes is 4.3N. The radius of the shaft is 0.015m. What is the value of the coefficient of static friction?
with an expert karate blow, you shatter a concrete block. consider your hand to have a mass of .7 kg, to be moving 5 m/s as its strikes the block, what impulse does the block exert on your hand
A 0.80 kg mass is attached to a light spring with a force constant of 23.9 N/m and set into oscillation on a horizontal frictionless surface. determine maximum speed of the oscillating mass
A block of mass 5 kg hangs on a spring. When a second block with an identical mass of 5 kg is tied to the first, the spring stretches an additional ho = 1.5 m. What is the maximum speed attained by the remaining block
A Concave spherical mirror with focal length of 60 centimeter has a 10 centimeter pencil located perpendicular to the principal axis at 30 centimeter from the vertex of the mirror. Obtain the size of the radius of curvature of the mirror
1. discuss how a grandfather clock a pendulum clock accurate at 20oc will run fast or slow on a hot day say
A bicycle is turned upside down while its owner repairs a flat tire. A friend spins the other wheel of radius 0.4 m and observes that drops of water fly off tangentially. Find the angular deceleration of the wheel
A wave pulse travels down a slinky. The mass of the slinky is m = 0.85 kg and is initially stretched to a length L = 6.2 m. compute the speed of the wave pulse
Tension is maintained in a string as in the figure below. The observed wave speed is v = 21.0 m/s when the suspended mass is m = 3.00 kg. What is the mass per unit length of the string
Two 11cm diameter electrodes 0.50cm apart form a parallel-plate capacitor. The electrodes are attached by metal wires to the terminals of a 15V battery. After a long time, the capacitor is disconnected from the battery but is not discharged.
A diver running 2.5 drives out horizontally from the edge of a vertical cliff and 2.7 later reaches the water below. How high was the cliff
A fly sits on a potter's wheel .30 m from its axle. The wheel's rotational speed decreases from 4.0 rad/s to 2.0 rad/s in 5.0 s. Determine the wheel's average rotational acceleration
A mass m=1.85 kg in a spring-mass system with k=5.44 N/m is observed to be moving to the right, past its equilibrium position with a speed of 4.38 m/s at time t=0. determine the equation of motion
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