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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?
971-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 30.0 m/s. What is the average force exerted on the car
A person with a nearsighted eye has near and far points of16 cm and 34 cm, respectively. Assuming a lens is placed 2.0 cm from the eye, what power should the lens have to correct this condition?
An ocean liner leaves New York City and travels 13° north of east for 268 km. How far east and how far north has it gone? In other words, what are magnitudes of the components of the ship's displacement vector in the following directions.
A cable is 5.00 m long and has a diameter of 1.50 mm. The tensile modulus of the cable is 2.50 × 1010 N/m2. A force is applied to the end of the cable and the cable stretches by 3.00 mm. What is the applied force?
a golf ball is dropped from rest from a height of 8.80 m. it hits the pavement then bounces back up rising just 5.80 m
A series RLC circuit has a resistance of 500ohms and inductance of 20mH and a capacitance of 2uF. What is the rms current in this circuit
two speakers spaced a distance 1.5 m apart emit coherent sound waves at a frequency of 680 hz in all directions. the
The top of a refrigerator has an area of 0.6m2. The height of the refrigerator is 180 cm. What volume does refrigerator occupy in cubic meters.
A horizontal beam 4m long is attached to a vertical wall with a hinge at one end, and a body of weight 500N hangs from the outer end. The beam is supported with a guy wire from its outer end to the wall directly above the beam.
A uniform thin rod of mass 4.19 kg pivots about an axis through its center and perpendicular to its length. What must the length of the rod be so that the moment of inertia of the three-body system with respect to the described axis is 0.977 kg·m2
The average intensity of light emerging from a polarizing sheet is0.767 W/m2, and the averageintensity of the horizontally polarized light incident on the sheetis 0.937 W/m2.
William Tell is shooting at an apple that hangs on a tree. The apple is a horizontal distance of 20.0 m away and at a height of 4.00 m above the ground. what is the arrow's initial velocity
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