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A charge of -3.35 nC and a charge of -6.40 nC are separated by a distance of 80.0 cm. Find the position at which a third charge of +7.60 nC can be placed so that the net electrostatic force on it is
The combined mass is shot horizontally off the cliff. With what speed does the mass hit the ground at the bottom of the cliff?
To get off a frozen, frictionless lake, a 71.0 kg person takes off a 0.170 kg shoe and throws it horizontally, directly away from the shore with a speed of 2.00 m/s. If the person is 5.20 m from th
When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 10 cm that has a coeffici
If a heater supplies 1.8 x 106 J/h to a room 3.5 m x 4.6 m x 3.0 m containing air at 20 ºC and 1 atm, by how much will the temperature rise in one hour, assuming no losses of heat or air mass t
An electron is moving in free space with a velocity equal to 105 m/s and is aiming at a stationary electron far away , How close can this electron get to the stationary electron before repulsive for
Determine its maximum angular displacement. (For large v, and/or small l, the small angle approximation may not be good enough here.)
Acording to a rule of thumb, every 5 secondes between a lighting flash and a following thunder, gives the distance to the flashind miles. Assuming that the flash of light arrives in essentially no t
The bullet passes through the block and emerges with its speed reduced to 180 m/s. The block slides a distance of 44.0 cm along the surface from its initial position. a) What is the coefficient of k
A pinball machine launches a 153 g ball with a spring-driven plunger. The game board is inclined at 9 degrees above the horizontal.
Calculate the work done in time t by the forces of constraint acting on the particle and on the wedge. What are the constants of motion for the system?
Determine the amount of mass that the submarine must take on if it is to descend at a constant speed of 1.00 m/s, when the resistive force on it is 1097 N in the upward direction. The density of sea
A 12.0 V battery has an internal resistance of 0.080 ohm. If the battery supplies 100 A when connected to a starter motor, what is the resistance of the motor?
A 6.0 ohm resistor and a 3.0 ohm resistor are connected in parallel to a 1.5 V battery of negligible internal resistance. What is the current in the 3.0 ohm resistor?
Find the force exerted by these charges on a fourth charge q = +3 nC at the remaining (upper right) corner. (Assume the +x axis is directed to the right and the +y axis is directed upward.)
A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion = 1.30 10-4°C-1). At room temperature (20.0°C), the frames have circular lens holes 2.20 cm in radius.
A 1.5-kg mass attached to spring with a force constant of 20.0 N/m oscillates on a horizontal, frictionless track. At t = 0, the mass is released from rest at x = 10.0 cm. ( That is, the spring is
The resistance of a wire increases 3.9% when the temperature of the wire is raised 100°C. What is the temperature coefficient of resistivity of the wire material?
A 2.50 A current is carried by a copper wire of radius 1.0 mm. If the density of conduction electrons is 8.0E28/m3, what is the drift velocity of the conduction electrons?
A mass less vertical spring is displaced 0.15 m when a 3.25 kg mass is attached. When used horizontally, what is the total energy ff the spring has an amplitude of 0.25 m?
An attack helicopter is equipped with a 20mm cannon tat fires 112 g shells in the foward derection with a muzzle speed of 743 m/s. The fully loaded helicopter has a mass of 1630 kg. A burst of 238 s
Markings to indicate length are placed on a steel tape in a room that is at a temperature of 22°C. Measurements are then made with the same tape on a day when the temperature is 27°C. Are t
A physics student throws a bowling ball straight up into the air. THe ball was in the air for a total of 8.44 seconeds before it was caught at its orignial position. What was the intial velocity of
Solar cells can produce 39.8 W of electricity per square meter of surface area if directly facing the Sun. How large an area is needed to supply the needs of a house that requires 23.3 kWh/day? (As
A hockey player makes a slap shot exerting a force of 30 N on a 0.115 kg hockey puck for 0.16 seconds. How fast is it moving after he hit the puck assuming it started from rest?