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Three insulating balls are suspended from thin threads. Various objects are then rubbed against other objects and each of the insulating balls is charged by touching them with one of these objects. In each case, be sure to discuss why you chose the answer you did. a. In one set of experiments, it is found that balls 1 and 2 repel each other and that balls 2 and 3 repel each other. From this we can conclude that i. 1 and 3 carry charges of opposite sign ii. 1 and 3 carry charges of the same sign iii. all three balls carry charges of the same sign iv. one of the objects carries no charge v. we need to do more experiments to determine the sign of the charges b. In a second set of experiments, it is found that balls 1 and 2 attract each other and that balls 2 and 3 repel each other. From this we can conclude that i. 1 and 3 carry charges of opposite sign ii. 1 and 3 carry charges of the same sign iii. all three balls carry charges of the same sign iv. one of the objects carries no charge v. we need to do more experiments to determine the sign of the charges.
What is the least time necessary for crossing
A baseball pitcher can throw a ball with a speed of 70m/s. He is in the back of a pickup truck that is driving away from you. He throws the ball in the direction, and it floats toward you at a lazy 10 m/s.
How much work is done by the outside force in moving the particle from A to B?
A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.6m/s at ground level. Its engines then fire and it accelerates upward at 3.80 m/s2 until it reaches an altitude of 930m. At that point its engines fai..
Graph the power of the laser when it's on. b) Compute the energy in the pulse. c) Compute the number of photons in the pulse.
When a 5.5 cm long pencil is arranged perpendicular to a convex mirror's optical axis at a distance of 29 cm from the mirror, its image is 2.8 cm tall. (a) What is the mirror's focal length? (b) How tall is the pencil's image if the pencil is move..
find out the change in electric potential energy. For lengths of 1.000 m, 0.750 m, and 0.500 m, total time.
Computing the kinetic energy, takeoff speed, and kinetic energy per kilogram.
A 1700kg car travelling at a speed of 40m/s skids to the halt on wet concrete where f_k = 0.3. How long are the skid marks.
A sound wave traveling at 341m/s is emitted by foghorn of a tugboat. An echo is heard 3.30s later.
The total force on a one foot wide section of the inclined portion of the wall and the location and line of action of the resultant force.
A 0.5 kg block of ice is sliding by you on a very slippery floor at 2.5m/s. As it goes by, you give it a kick perpendicular to its path. Your foot is in contact with ice block for 0.0025 seconds.
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