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A platinum resistance thermometer has a resistances of 200 when placed in a 0C ice bath and 255.8 when immersed in a crucible containing a melting substance. What is the melting point of this substance? (Hint: first determine the resistance of the platinum resistance thermometer at room temp, 20C).
Consider three resistors with unequal resistances connected in series to a battery. Which of the following statements are true? 1. The current flowing through each of the resistors is the same and is equal to the current supplied by the battery.
A swimmer bounces straight up from a diving board and falls feet first into a pool. What is her velocity when her feet hit the water
An object floating in a lake has 15 percent of its volume above the lake surface. What is the density of the object
The electric field inside a 50.0?cm? long copper wire is 5.00mV/m .What is the potential difference between the ends of the wire
Consider a flagpole (mass 20kg and length 10m) attached to the wall by a cable, What is the magnitude and direction of the force exerted by the hinge on the flagpole
A 3.00-g copper penny at 25.0 C drops 50.0 m to the ground. (a) If 60 percent of the initial potential energy of the coin earth system goes increasing internal energy of the coin determine the coin's final temperature (b) does the result depends on m..
You throw a glob of putty straight up toward the ceiling, which is 3.00m above the point where the putty leaves your hand. What is the speed of the putty just before it strikes the ceiling
A sign (mass 1700kg ) hangs from the end of a vertical steel girder with a cross-sectional area of 0.013m^2, What is the stress within the girder
A 90 kg man lying on a surface of negligible friction shoves a67 g stone away from himself, giving it a speed of 4.0 m/s . Whats peed does the man acquire as a result
A wire carries current to the north (towards the top of the computer screen) through a magnetic field. what is the direction of the magnetic force on the current-carrying wire
A particular spring has a force constant of 2.8×103N/m, How much work is done in stretching the relaxed spring by 7.0cm
Three light bulbs each with a resistance of 50W, are connected in series to a 100 V power supply. What is the current flowing through the third light bulb.
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