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Q. A street lamp weighs 130 N. It is supported by two wires that form the angle of 140° with each other. The tensions in the wires are equal. What is the tension in each wire supporting the street lamp?
If the angle between wires supporting the street lamp is reduced to 110°, what is the tension in each wire?
A crate with mass 35.5 initially at rest on a warehouse floor is acted on by a net horizontal force of 120. What acceleration is produced.
Two astronauts, each having a mass M, are linked by a rope of length d having negligible mass. They are isolated in space, orbiting their center of mass at speeds v.
An archer puts a 0.33 kg arrow to the bowstring. An average force of 183 N is exerted to draw the string back 1.3 m. suppose that air resistance is negligible.
determine the weight of the collar.
A runner of mass 51 kg runs around the edge of a horizontal turntable mounted on a vertical, frictionless axis through its center. The runner's velocity relative to the earth has magnitude 3.50 m/s. The turntable is rotating in the opposite direct..
Batteries are rated in terms of ampere-hours (A h). For example, a battery that can produce the current of 3.00 A for 5.00 h is rated at 15.00 A h. What is the total energy stored in an 8.0-V battery rated at 49.0 A h.
An inductor used in a dc power supply has an inductance of 13.0 H and a resistance of 230 Omega. It carries a current of 0.210 A. What is the energy stored in the magnetic field? At what rate is thermal energy developed in the inductor? Does your rep..
What is the electric field strength a point on the axis 5.0 cm from one disk between them.
A 2.25×10^4 elevator is to be accelerated upward by connecting it to a counterweight using a light (but strong!) cable passing over a solid uniform disk-shaped pulley. There is no appreciable friction at the axle of the pulley, other than its mass..
how long one electron to travel the full length of the cable.
A soccer player 'heads' the size 5 ball deflecting it by 46.0°, and keeps its speed of 15.90 m/s constant. A size 5 ball has a mass of approximately 0.421 kg. What is the magnitude of the impulse which the player must impart to the ball.
A car traveling at 93km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.75 m. What was average acceleration of the driver during the collision? Express the answer in terms of "g's," where 1.00g ..
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