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A bird sits on a telephone wire midway between two poles 20 meters apart. The wire, assumed weightless, sags by 50 cm. If the tension in the wire is 90 Newtons, what is the mass of the bird?
q1. two plane mirrors are separated by 140deg as drawing illustrates. if a ray strikes mirror m1 at the 75deg angle of
q1. an 1100- car is held in place by a light cable on a very smooth frictionless ramp. the cable makes an angle of 31.0
A ray of light passes from air through dense flint glass and then back into air. How far is the ray displaced as a result of traveling through the glass
A compact disk, which has a radius of 6.0cm, What is the tengential acceleration of a point on the outer rim of the disk at the moment when its angular speed is 2.00 rev/s
Assuming no heat loss to the surrounding environment, determine the minimum duration of time necessary for a 100 W aquarium tank heater to raise the temperature of 20.0 gallons of water by a difference of 10.0°C.
A 32.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 21.00 m. Calculate the mechanical energy lost due to friction
When a diver jumps off a diving board into a pool, while in the air, it is easier to somersault while their body is tucked into a ball-like shape and harder while their body is extended?
Find the total number of lines in a 3.0cm -wide diffraction grating whose third-order spectrum has the 660nm hydrogen theta spectral line at an angular position of 41degree celcius.
A small metal ball is given a negative charge, then brought near (i.e., within a few millimetres) to end A of the rod. What happens to end A of the rod when the ball approaches it closely this first time.
Calculate the nonconservative work
A car with the mass of 1500.0 kg (initially moving to the right) collides with a bus that has a mass of 5000.0 kg. What is the initial velocity of the bus
A potter's wheel having a radius 0.53 m and a moment of inertia of 14.9 kg · m2 is rotating freely at 46 rev/min. Find the effective coefficient of kinetic friction between the wheel and the wet rag
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