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Two packages are connected by a very light string that goes over an ideal pulley as shown in the figure. Package A has a mass of 3.0 kg and can slide along a rough plane inclined at 30° above the horizontal. The string acts on package A parallel to the surface of the plane. The coefficient of static friction between package A and the plane is 0.40. What minimum mass should package B have in order to start package A sliding up the ramp?
A tetherball leans against the smooth, frictionless post to which it is attached. The string is attached to the center of the ball. If the string is L = 1.20m long and the ball has a radius of r = 0.150m with mass m = 0.250kg
With both switches open, the current leads the emf by 30.9o. With switch S1 closed and switch S2 still open, the emf leads the current by 15.0o. With both switches closed, the current amplitude is 423 mA. What is the value of R? What is the value of ..
A divers lungs hold 0.0050 m^3 of air at sea level, where the pressure is 101.3 kPa. what is the volume of the air in his lungs at a depth of 3 m
Two 2.00 µC charged particles are placed on the x axis. One is at x =1.00 meter, and the other is at x = -1.00 meter. Calculate the electric field on the y axis at y =.500 meter
A golfer hits a shot to a green that is elevated 2.60 m above the point where the ball is struck. find the speed of the ball just before it lands
When a potential difference of 221 V is applied to two plates of a parallel-plate capacitor, the inner surface of the positive plate carries a surface charge density of 40 nC/cm2. What is the spacing between the plates
The charges and coordinates of two charged particles held fixed in an xy plane are q1 = +2.9 ?C, x1 = 3.5 cm, y1 = 0.50 cm, Find the magnitude and direction of the electrostatic force
A 10.3 kg block is dragged over a rough, horizontal surface by a 63.6 N force acting at 21° above the horizontal. Find the total change in the block's kinetic energy
Find the velocity of your feet, v, due to the rotation of Earth. Assume that Earth is a perfect sphere of radius R=6378km and that a day is exactly 24 hours long.
A meter long 1.0 cm diameter nichrome heater wire is associated to a 12V battery. What is the magnetic field strength 1.0 cm away from the wire.
A solenoid is 1.6 m long and has 530 turns per meter. what is the cross sectional area of this solenoid if it stores .31 J of energy when it carries I=14A
At time t1 = 2.00 s, the acceleration of a particle in counterclockwise circular motion is (1.00 m/s2) i + (6.00 m/s2) j. What is the radius of the path taken by the particle
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