Temperature of a real resistor
Current causes the temperature of a real resistor to increase why? What effect does this heating have on the resistance? Explain
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A diving board of length 3.00 is supported at a point 1.00 from the end, and a diver weighing 540 stands at the free end. The diving board is of uniform cross section and weighs 265. What is the magnitude at the support point?
A group of swimmers is resting in the sun on an off-shore raft. They estimate that 2.8 m separate a trough and an adjacent crest of surface waves on the lake. They count 13 crests that pass by the raft in 18.5 s. How fast are the waves moving? Ans
A proton moves with a speed of 2.4 106 m/s horizontally, at a right angle to a magnetic field. What magnetic field strength is required to just balance the weight of the proton and keep it moving horizontally?
Bonnie and Clyde are sliding a 287 kg bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with 385 N of force while Bonnie pulls forward on a rope with 355 N of force. What is the safe
Three identical masses of 410 each are placed on the x axis. One mass is at = -11.0 , one is at the origin, and one is at = 33.0 . What is the magnitude of the net gravitational force on the mass at the origin due to the other two masses?
Many traffic lights change when a car rolls up to the intersection. How does the light sense the presence of the car?
You measure the mass of a physics textbook to be 3.20±0.07 kg, and use this value to estimate the total mass of 700 identical physics textbooks in the bookstore. What is the absolute uncertainty in your estimate of the total mass?
A crate of mass m = 27 kg rides on the bed of a truck attached by a cord to the back of the cab as in the figure. The cord can withstand a maximum tension of 53 N before breaking. Neglecting friction between the crate and truck bed, find the maxi
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