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The flash unit in a camera uses a 9 V battery to charge a capacitor.The capacitor is then discharged through a flash lamp. obtain the capacitance of the capacitor
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 11-g nail
A 48\Omega resistor is connected across a battery, and a 29mA current flows. What is the battery's emf? What is the internal resistance
An old-style TV set places 25 kV across two plates of a parallel plate capacitor. An electron is released very close to one plate, compute the speed of the electron when it exits the hole
In a study of proteins mediating cell membrane transport,microbiologists measure current versus time through the cellmembranes of oocytes (nearly mature egg cells) taken from theAfrican clawed frog,
A string under a tension of 58.5 N is used to whirl a rock in a horizontal circle of radius 2.75 m at a speed of 20.5 m/s on a frictionless surface, What is the breaking strength, in newtons, of the
A parallel plate capacitor has square plates with sides of length 10 cm. The distance between the plates is 4 mm. What is the amount of charge on each plate
A lamp (R=150), an electric heater (R=23), and a fan (R=50) are connected in parallel across a123V line. calculate the power is expended in the heater
An incandescent lightbulb draws 0.50 A, while a compact fluorescent with the same light output draws 125 mA. How do their energy-consumption rates compare
A 315 kg sailboat has an acceleration of 0.72 m/s2 at an angle of 33° north of east. compute direction of the net force that acts on the sailboat
Parallel conducting tracks, separated by 2.79 cm, run north and south. There is a uniform magnetic field of 1.27 T pointing upward (out of the page). What is the direction of the magnetic force on t
A horizontal desk surface measures 2.52 m x 2.05 m. If Earth's magnetic field has magnitude 0.463 mT, what is the magnetic flux through the desk surface
A -10uC charge is 3cm away from a +10uC charge. and is 4cm to the left from a +64uC charge. Find the net force on the +10uC charge
A +10uC charge is 20cm away from a -40uC charge. Detrmine the field of intensity
In the quark model of fundamental particles, a proton is composed of three quarks: two "up" quarks, each having charge +2e/3, calculate the potential energy of the subsystem of two "up" quarks
Consider two widely separated conducting spheres, 1 and 2, the second having four times the diameter of the first. What is the ratio of the final surface charge density of spheres
A 69-kg lumberjack stands at one end of a 409-kg floating log, as shown in the figure. Both the log and the lumberjack are at rest initially. calculate the lumberjacks speed relative to the shore
Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 1.00 m. compute the magnitude of the initial acceleration of the third sphere
Using a simply pulley/rope system, a crewman on an Arctic expedition is trying to lower a 5.52 kg crate to the bottom of a steep ravine of height 23.9 meters. At what speed will the crewman hit the
Calculate the force required to pull a copper ball of radius 3.00 cm upward through a fluid at the constant speed 6.00 cm/s
A parallel-plate capacitor is made from two aluminum-foil sheets, each 5.6 wide and 6.0long. evaluate the capacitance of this capacitor
A 2.0 kg object moving with a velocity of +6.0 m/s collides with a 6.0 kg object that is initially at rest. Find the energy lost in the collision.
A dragster drives a quarter mile (402 m) at a constant rate of acceleration, starting from rest and finishing the race at a final speed of 450 km/hr. what average power was developed by the engine
The current in a 100 watt lightbulb is 0.800 A. The filament inside the bulb is 0.220 mm in diameter. What is the current density in the filament
Stopping a 747 A 747 jetliner lands and begins to slow to a stop as it moves along the runway. find How far has it traveled in this time