What should be the spring constant k
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?
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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
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
a circuit contains six 240 ohm lamps, 60 w bulbs, and a 10 ohm heater sonnected in parallel. the voltage across the curcuit is 120 v. what is the current in the circuit .
A spherical steel ball bearing has a diameter of 2.540 cm at 24°C. (a) What is the diameter when its temperature is raised to 82°C?
A circular surface with a radius of 0.067 m is exposed to a uniform electric field of magnitude 1.92 x 104 N/C. The electric flux through the surface is 56 N·m2/C. What is the angle between the direction of the electric field and the normal
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