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a) Two identical point charges of q = +1.50 x 10-8 C are separated by a distance of 1.10 m. What is the minimum amount of work required by an external force to move them closer together so that they are only 0.60 m apart?
b) What is the electric potential energy of three equal positive charges of 1.20 µC when they are arranged to form a triangle 2.50 x 10-3 m on a side?
Consider a reference frame associated with a free falling cabin, which is moving with an acceleration of g = 9.8m/s^2. At time t=0 the cabin is at rest. Is this reference frame inertial
an unstrained horizontal spring has a length of 0.27 m and a spring constant of 230 nm. two small charged objects are
An engine develops an output of 117 hp when rotating at 2300 rpm. Compute the output torque
An aluminum rod is 24.0 cm long at 20°C and has a mass of 350 g. If 13,500 J of energy is added to the rod by heat, what is the change in length of the rod
q1. what is the fundamental frequency of a 0.30 m long organ pipe that is closed at one end when the speed of sound in
A 53.0-kg person jumps from rest from the top of a 10.0-m-high tower straight down into the water. Determine the magnitude of the average force that the water exerts on the diver
A scuba diver and her gear displace a volume of 70.0L and have a total mass of 73.1kg. What is the buoyant force on the diver in sea water
A 1300kg car is going 50mph. Find the thermal energy created in the car's brakes when stopping the car. Express your answer to two significant figures and include the appropriate units.
Two spectators at a soccer game in Montjuic Stadium see, and a moment later hear, the ball being kicked on the playing field. The time delay for the spectator is 0.23 s, and for spectator B it is 0.12 s.
A rock of mass 43 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 257 N. What is the magnitude of the acceleration of the rock?
Calculate the linear acceleration of a car, the 0.310 m radius tires of which have an angular acceleration of 15.0 rad/s2. Assume no slippage. What is the final velocity of the car
Briefly describe how the resulting interference pattern will differ for the various types of particles - the shower of particles will scatter in all directions with equal probability. Is it possible to determine in advance the trajectory of any in..
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