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A resistor is connected across the terminals of a 9.0-V battery, which delivers 1.9 x 105 J of energy to the resistor in 7.0 hours. What is the resistance of the resistor?
700 g of an unknown metal powder at Thot = 78°C are dropped into a negligible heat capacity calorimeter containing 140 g of water at 11°C, Calculate the specific heat of the metal powder
A tennis ball of mass = 0.068kg and speed = 21m/s strikes a wall at a 45 degree angle and rebounds with the same speed at 45 degrees. What is the magnitude of the impulse given to the ball
A train moving with constant velocity travels 180 meters north in 14 seconds and an undetermined distance to the west. compute the direction of the train's motion relative to north
A small spherical insulator of mass 1.65 x 10-2 kgand charge +0.600 C is hung by a thin wire of negligible mass. A charge of-0.900 C is held 0.150 m away from the sphere and directly to the right of it, so the wire makes an angle with the vertical..
A firework explodes 120 m above the ground. Determine the time difference between two observers hearing the explosion
Presume the needle moves 7.5 mm from its highest to its lowest position and it makes 26 stitches in 9.1 s. What is the highest needle speed.
A bolt drops from the ceiling of a moving train car that is accelerating northward at a rate of 2.09 m/s2. What is the acceleration of the bolt relative to the train car
Consider a wheatstone bridge. Suppose a resistance Rx is istalled as the unknown, and the bridge is balanced giving a potentiometer divider ratio S_o. Now leave the potentiometer alone but let the unknown resistance change by a small amount DeltaR..
Two lenses have focal lengths of 25.0cm and -50.0cm and are separated by 20.0cm. Where is the final image formed
A dipole moment is placed in a uniform electric field oriented along an unknown direction. The maximum torque applied to the dipole is equal to 0.1 N.m. When the dipole reaches equilibrium its potential energy is equal to -0.2 J.
A pulse from a ruby laser (lambda = 694.3 nm) has an average power of 30 MW and lasts 2.9 ns. How many photons are emitted in this pulse
A 1000-kilogram race car is traveling at 60 m/s around a curved section of track that has a radius of 300 m. What is the centripetal force that acts on the car
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