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A 120-V motor has mechanical power output of2.10hp. It is84.0%efficient in converting power that it takes in by electrical transmission into mechanical power. Find the current in the motor
A certain lightbulb has a tungsten filament with a resistance of 18.0 when cold and 138 when hot. Find the temperature of the hot filament
A force of 45 N acts on a ball for 0.2 sec If the ball is initially at rest, What is the final momentum of the ball
A parallel-plate capacitor C is charged up to a potential V with a charge of magnitude Q on each plate. What is the potential difference across the plates in terms of V
An aluminum wire carrying a current of 4.0 A has a cross-sectional area of 9.0 10-6 m2. Find the drift speed of the electrons in the wire
The atomic planes in a crysral are spaced d = 0.50 nm apart. These planes are used in a diffraction experiment with X-rays with ? = 0.05 nm. What are the diffraction angles for the first three brigh
A plastic sheet of thickness 250 nm appears to be green in the figure below (?green=500nm), What is the plastic's index of refraction
A Young's double-slit interference experiment gives bright fringes separated by 2.5 cm on a screen when the experiment is performed in air. What is the new spacing between bright fringes
A very thin bubble is floating in air. If the bubble strongly reflects green light (? = 520 nm), what is the minimum possible thickness of the bubble
Monochromatic light (Wavelength = 500 nm) passes through two slits and onto a screen 2.5 m away. what is the new distance between bright fringes
During a stage production of Peter Pan, the 53.5 kg actress playing Peter has to fly in vertically (descend). To be in time with the music, compute the tension in the wire supporting the actor
A positive charge of q1 is located 4.59 m to the left of a negative charge q2. The charges have different magnitudes. How far to the left of the negative charge is one spot
An airplane pilot fell 355 m after jumping from an aircraft without his parachute opening. He landed in a snowbank, creating a crater 1.3 m deep, Estimate the work done by the snow in bringing him t
A single photogate is programed to start a timer when it is blocked and stop the timer when it is unblocked. What is the speed of the sphere
A 3.18-nF parallel-plate capacitor is charged to an initial potential difference ?Vi = 100 V and is then isolated. How much work is required to withdraw the porcelain sheet
It is fairly easy to strip the two electrons off a helium atom, leaving a bare nucleus of two neutrons and two protons. What is the necessary voltage difference
An experimental apparatus includes a prism made of sodium chloride (n=1.54). what is the required apex angle of the prism
Three people pull simultaneously on a stubborn donkey. Jack pulls directly ahead of the donkey with a force of 81.7 N, Find the magnitude of the net force the people exert on the donkey
For a patient, a doctor prescribes glasses with a converging lens having a power of 4.0 D What is the location of her eye's near point
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 18.0 cm, Find the electric field just outside the paint layer
Pluto has a mass of 1.30x10^22 kg and a radius of 1.18x10^6 m. What is the acceleration due to gravity on Pluto
An electron and a positron (an antielectron) make a head-on collision, each moving at v=0.99999c. What is the kinetic energy of each of the muons
Suppose we measure the terminal voltage of a rechargeable NiCad battery and find it to be 1.28 V when measured by a voltmeter. calculate the internal resistance of the battery
During a stage production of Peter Pan, the 53.5 kg actress playing Peter has to fly in vertically (descend). Calculate the tension in the wire supporting the actor
An airplane pilot fell 355 m after jumping from an aircraft without his parachute opening. He landed in a snowbank, creating a crater 1.3 m deep, estimate the work done on him by air resistance as h