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A wire of nichrome of length 80cm has a resistance of 50 ohms. if the wire is four folded, find new resistance.
A rifle is aimed horizontally at a target 48 m away. The bullet hits the target 2.5cm below the aim point, What was the bullet's speed as it left the barrel
In an experiment on the photoelectric effect, a metal is illuminated by light. Electrons are emitted when the light's wavelength is less than 670 nm. What is the metal's work function
You've made the finals of the Science Olympics! As one of your tasks, you're given 1.5g of copper and asked to make a cylindrical wire, What length l will you choose for your wire
A constant force is applied to an object, causing the object to accelerate at 10m/s2. obtain what will the acceleration be if the force is halved
A sailor strikes the side of his ship just below the surface of the sea. He hears echo of the wave reflected from the ocean floor directly below 9 s later. How deep is the ocean at this point.
A toroidal solenoid has a mean radius of 14.0 and a cross-sectional area of 3.40 and is wound uniformly with 120 turns. What is the mutual inductance of these coils
Your cell phone typically consumes about 440 mW of power when you text a friend. what is the current flowing through the cell-phone circuitry under these circumstances
after flying for 15 min in a wind blowing 42 kmh at an angle of 28deg south of east an airplane pilot is over a town
A large steam pipe is covered with 1.7-cm-thick insulating material of thermal conductivity 0.31 J/(s m °C). How much energy is lost every second when the steam is at 185 °C
What happens to the Heat and Temperature during a Phase Change? (For example: Solid to Liquid, Liquid to Gas, or Solid to Gas directly)
The centers of a 13.0 kg lead ball and a 120 g lead ball are separated by 15.0 cm. What gravitational force does each exert on the other
two ropes support a load 312 kg. the two ropes are perpendicular to each other, and the tension in the first rope is 2.48 times that of the second rope. Find the tension in the second rope
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