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A pirate sights a distant ship with a spyglass that gives an angular magnification of 24. If the focal length of the eyepiece is 14 , what is the focal length of the objective?
A sailor strikes the side of his ship just below the waterline. He hears the echo of the sound reflected from the ocean floor directly below 1.3 s later. How deep is the ocean at this point? Suppose the speed of sound in seawater is 1560 m/s and d..
Consider a simple model for the interior of the Earth: there is a spherical iron core with constant mass density ?0 and radius a; outside the core is "rock" with constant density ?1. Use these values for the densities: ?0= 8.70×103 kg/m^3 and ?1= ..
If a charge of ?2.20 ?C is placed at this point, what are the magnitude and direction of the force on it
A car travelling at 37 {rm m/s} runs out of gas while travelling up a 7.0{rm ^ {circ}} slope. How far would it coast before starting to roll back down.
A 4.0-m-long steel wire has a cross-sectional area of 0.050cm^{2}. Its proportional limit has a value of 0.0016 times its Young's modulus. What is the maximum weight that the wire can support
It has been suggested that we should use our power plants to generate energy in the off-hours (such as late at night) and store it for use during the day. What length of flywheel would you need in that case
To test the quality of a tennis ball, you drop it onto the floor from a height of 4.00 m. What is the magnitude of its average acceleration during the contact with the floor
An arrow is shot vertically upward and then 2.02 s later passes the top of a tree 41.3 m high. How much longer will the arrow travel upward, and how high will it go
You need to prepare a 0.187mm-diameter tungsten wire with a resistance of 3.43 ohm. How long must the wire be
An object falls because of gravity at a rate of -9.80 m/s2 (- sign is indicative of a downward direction) for 10.00 Seconds. If it starts from rest (vo= 0) and its position starts from do= 0.0, where is it 10.00 Seconds later.
A thin, uniform rod has length L and mass M . Calculate the magnitude of the gravitational force the rod exerts on a particle with mass m
A fire helicopter carries a 580 kg bucket of water at the end of a 20.0 m longcable. Flying back from a fire at a constant speed of 40.0 m/s, Determine the force of air resistance on the bucket
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