How does the light sense the presence of the car
Many traffic lights change when a car rolls up to the intersection. How does the light sense the presence of the car?
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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
Current causes the temperature of a real resistor to increase why? What effect does this heating have on the resistance? Explain
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?
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
What should be the spring constant k of a spring designed to bring a 1500 {rm kg} car to rest from a speed of 90 {rm km/h} so that the occupants undergo a maximum acceleration of 5.0g?
In an ultra-high-vacuum system, the pressure is measured to be 1.00 X 10-10 torr (where 1 torr = 133 Pa). Assuming the molecular diameter is 3.00 % 10-10 m, the average molecular speed is 500 m/s, and the temperature is 300 K, find
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