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Question: A 120-kg mail bag hangs by a vertical rope 3.5 m long. A postal worker then displaces the bag to a position 2.0 m sideways from its original position, always keeping the rope taut.
(a) What horizontal force is necessary to hold the bag in the new position?
(b) As the bag is moved to this position, how much work is done
(i) By the rope and (ii) by the worker?
Physics: How much time is required to row cross the river? How wide is the river?, A river man can row his boat at a speed of 2.5 m/s through still water. He wants to row directly across a river that has a current flowing at 1.5m/s
A carousel at the local carnival rotates once every 49.9 seconds. What is the linear speed of an outer horse on the carousel, What is the linear speed of an inner horse
In the lab you place a beaker that is half full of water (density ρw) on a scale. You now use a light string to suspend a piece of metal of volume V in the water. The metal is completely submerged, and none of the water spills out of the beake..
An unspecified force causes a 0.2-kg object to accelerate at 0.4 m/s2. find the acceleration (in m/s2) of the heavier object
When a 65-kg person climbs into a 1000-kg car, the car'ssprings compress vertically by 2.8 cm. What will be the frequency of vibration when the car hits a bump
A battery is connected in series with a 0.31-? resistor and an inductor, Find the inductance of the circuit
A light bulb is wired in series with a 133-? resistor, and they are connected across a 120-V source. What are the two possible resistances of the light bulb
An object is placed 19 cm to the left of a converging lens of focal length 30 cm. Find the position and magnification of the final image
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1230 Hz, What is the speed of the bird
In a railroad switchyard, a 50 ton freight car is sent at 7.4 mi/h toward a 27 ton car that is moving in the same direction at 2.0 mi/h. What is the speed of the pair after they couple together
An object falls from a height h from rest. If it travels a fraction of the total height of 0.6995 in the last 1.00 s, Find the height of its fall
A 250g ice cube at -10?C is placed in an aluminum cup whose initial temperature is 70?C. The system comes to an equilibrium temperature of 20?C
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