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Three resistors, of 8.0 %u03A9, 12 %u03A9, and 24 %u03A9, are in parallel, and a current of 20 A is drawn by the combination. Determine
(a) the potential difference across the combination and
(b) the current through each resistance.
A tennis player hits a 1.45 kg tennis ball with a racket of mass 2.5 kg. what impulse did he imply on the ball
A model rocket engine has an average thrust of 5.26 N. It has an initial mass of 25.9 g, which includes fuel mass of 13.4 g. What is the average exhaust speed of the engine
A plane sinusoidal electromagnetic wave in air has a wavelength of 3.90cm and an E field amplitude of 1.40V/m. What is the magnetic field amplitude?
A bicycle wheel is rotating at 40rpm when the cyclist begins to pedal harder, giving the wheel a constant angular acceleration of 0.45rad/s2, What is the wheel's angular velocity, in rpm, 10s later
A pulley system has an efficiency of 87.5 percent. How much of the rope must be pulled in if a force of 648 N is is needed to lfit a 150kg desk 2.46m .
A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.05 x 10^4 rad/s to 3.14 x 10^4 rad/s. In the process, What is the frequency of red light with a wavelength in vacuum of 600 nm
A source emits sound uniformly in all directions. There are no reflections of the sound. At the distance r1 from the source the sound is 3.9 dB louder than it is at a distance r2 from the source. What is the ratio r1/r2.
An AC adapter for a telephone-answering unit uses a transformer to reduce the line voltage of 120 V (rms) to a voltage of 10.0 V. What is the rms power delivered to the transformer
A camera has a lens with a focal length of 25.6 cm. how far from the film should the lens be placed
When two sticks are laid end-to-end they cover a length of 8.32 feet. One stick is 2.90 ft longer than the other. What is the length of the shorter stick in feet.
A 70 kg object is being pulled up a slope of 35 degrees with the horizontal so that the rope is parallel to the slope. what is the magnitude of the force pulling the block
The distance between the first and fifth minima of a single-slit diffraction pattern is 0.40 mm with the screen 50 cm away from the slit, Calculate the angle of the first diffraction minimum
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