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An amateur astronomer decides to build a telescope from a discarded pair of eyeglasses. One of the lenses has a refractive power of 11 diopters, while the other has a refractive power of 1.1 diopters. (a) How far apart should the lenses be separated? (b) What is the angular magnification of the telescope?
question1two boys are pulling a car of mass 800 kg along a level surface with a pair of ropes attached horizontally.
Suppose that 1.00 mole of an ideal monotomic gas begins at a temperature of 20.0 C. The gas starts at 1.00 atmosphere and triples the volume at constant pressure. What is the new temperature and how much work was done? How much heat was added or s..
A 330-g air track cart on a horizontal air track is attached to a string that goes over a pulley with a moment of inertia of 5.00 x 10-6 kg?m2 and a radius of 1.35 cm. Write Newton's second law equation for each of the three objects
A person throws a 1/2 kg brick out the window. What would be the resultant velocity of the wagon
An iron casting containing a number of cavities weighs 20052.8 N in air and 16121.0 N in water. What is the total volume of all the cavities in the casting
a diffraction grating is illuminated simultaneously with red light of wavelength 660 nm and light of an unknown
A lunch tray is being held in one hand, as the figure illustrates. The mass of the tray itself is 0.247 kg, and itscenter of gravity is located at its geometrical center. On the trayis a 1.01-kg plate of food and a 0.254-kg cup of coffee.
A ship's mast reaches to a height of 15 meters above the surface of a 10-meter- deep lake. When the sun is 30 degrees above the horizon, how long will the shadow of the mast be on the bottom of the lake?
A train is travelling up a 4.5 degree incline at a speed of 3.25 m/s when the last car breaks free and begins to coast without friction. a) How long does it take for the last car to come to rest momentarily? b) How far did the last car travel befo..
The magnetic field due to a 2-A current flowing in a long, straight wire is 8 ?T at a point P, a certain distance away from the wire. How far is this point from the center of the wire
A creamy salad dressing is made up of heavy cream, corn oil, If the cream layer is 2.20×10?2 m tall, the oil layer 2.80×10?2 m tall, and the vinegar layer 8.000e-3 m tall, what is the gauge pressure at the bottom of the jar
Jack and Jill ran up a hill at 3.4 m/s. The horizontal component of Jill's velocity vector was 2.5 m/s. What was theangle of the hill? What was the vertical component of Jill's velocity?
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