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Q. The charge Q of a non conducting ball with the radius R is uniformly distributed within the volume V of the ball calculate the electric field and the electric potential within this ball. The potential at the centre of the ball is 0V.
Q. To give a 18 kg child a ride, two teenagers pull on a 3.4 kg sled with ropes, as indicated in the figure. Both teenagers pull with a force of F = 51 N at an angle of 35° relative to the forward direction, which is the direction of motion. In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find the acceleration of the sled and child.
A flight attendant pulls her 72.0 N flight bag a distance of 282 m along a level airport floor at a constant speed. The force she exerts is 33.0 N at an angle of 52.0° above the horizontal.
A ball is thrown directly downward with an initial speed of 8.50 m/s, from the height of 29.5 m. After what time interval does it strike the ground.
Released from rest at the same height, a can of frozen juice rolls to the bottom of the same hill. What is the translational speed of the frozen juice can while it reaches bottom.
A shopper pushes a cart 39 m south down one aisle and then turns 90.0° west and moves 27 m. He then makes another 90.0° turn and moves 14 m.
A proton is placed in an electric field of intensity 700 N/C. What is magnitude and direction (towards or away from the field) of the acceleration of this proton because of this field? The charge on a proton is +1.6 x 10-19 C and the mass of a prot..
A box of books weighing 397 N is shoved across the floor by a force of 543 N exerted downward at an angle of 37 degrees below the horizontal.
A 0.350 m rod with uniform mass distribution runs along the x axis with its left end at the origin. A 1.80 m rod with uniform mass distribution runs along y axis with its top end at the origin. Find out the coordinates of the center of gravity for..
A 310 kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 28.0 m/s2 for 32.0 s, and then runs out of fuel. Overlook any air resistance effects.
What is the pressure (in kPa) exerted by an object that has a base which is 2cm by 4cm nd a weight of 45N.
A toy train is pushed forward and released at xi = 1.60 m with a speed of 2.60 m/s. It rolls at a steady speed for 1.30 s, and then one wheel begins to stick. The train comes to a stop 6m from its starting point. What is the train's acceleration a..
A 790-kg object and an 889-kg object are separated by 11.0 m. At what position (from the less massive object) can the 260-kg object be placed so as to experience a net force of 10 N towards the less massive object.
A group of hikers hears an echo 5 s after shouting. If the temperature is 16.0°C, how far away is the mountain that reflected the sound wave.
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