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When a 125-V emf is placed across two resistors in series, a current of 5.00 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 25.0 A. What is the absolute value of the smaller of the two resistances?
A toy rocket moving vertically upward passes by a 2.1m -high window whose sill is 8.0m above the ground. What was the launch speed of the rocket
Consider the skateboarder in the figure below. If she has a mass of 49 kg, an initial velocity of 23 m/s, what is the work done by friction on the skateboarder
A hanging iron wire with diameter 0.15 cm is initially 2.4 m long. When a 184 kg mass is hung from it, Find the approximate value of the effective spring stiffness of the interatomic force
You want to photograph a circular diffraction pattern whose central maximum has a diameter of 1.1. How far behind the pinhole should you place the viewing screen
A lamp is designed to operate at a temperature of 3100K. If the lamp is operated at a higher voltage that raises its temperature to 3500K
A lamp (R = 155 ), an electric heater (R = 27 ), and a fan (R = 51 ) are connected in parallel across a 118 V line. What power is expended in the heater
Calculate the work done, the amount of heat absorbed, and the change in internal energy during: melting of 1 gram of ice to water at a temperature of O degrees C under a constant pressure of 1 atmosphere. evaporation of 1 gram of water to water vapor..
A person can survive a feet-first impact at the speed of about 12 m/s (27 mi/h) on concrete; 15 m/s (34 mi/h) on soil; and 34 m/s (76 mi/h) on water. Why are there different values for different surfaces.
Find the power delivered by the good battery, and discuss where this power goes, assuming that the emf's and resistances of each battery remain the same throughout the process
Calculate the force a piano tuner applies to stretch a steel piano wire 7.70 mm, if the wire is originally 0.850 mm in diameter and 1.30 m long
if a 1500kg car is driven in sand at 5m/s, the coefficient of rolling friction is 0.06. What is the propulsion force need tot keep the car moving
At the instant of the figure, a 5.80 kg particle P has a position vector of magnitude 5.40 m and angle ?1 = 50.0° and a velocity vector of magnitude 1.10 m/s and angle ?2 = 30.0°. what are the magnitude of the torque acting on the particle
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