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A farsighted woman breaks her current eyeglasses and is using an old pair whose refractive power is 1.720 diopters. Since these eyeglasses do not completely correct her vision, she must hold a newpaper 42.00 cm from her eyes in order to read it. She wears the eyeglasses 2.10 cm from her eyes. How far is her near point from her eyes?
An anatomist is viewing heart muscle cells with a microscope that has two selectable objectives with refracting powers of 100 and 300diopters. When she uses the 100 diopter objective, the image of a cell subtends an angle of 3 multiplied by 10-3 rad with the eye. What angle is subtended when she uses the 300 diopter objective?
A microscope for viewing blood cells has an objective with a focal length of 0.50 cm and an eyepiece with a focal length of 2.5 cm. The distance between the objective and eyepiece is 14.0 cm. If a blood cell subtends an angle of 2.1 multiplied by 10-5 rad when viewed with the naked eye at a near point of 27.0 cm, what angle (magnitude only) does it subtend when viewed through the microscope?
A wire etched onto a computer chip carries a current of 0.000000030 A. In 1.8 milliseconds, how many electrons flow past a point on the wire
A distant galaxy emits light that has a wavelength of 683.2 nm. On earth, the wavelength of this light is measured to be 688.4 nm. (a) Decide whether this galaxy is approaching or receding from the earth.
A mass of 0.5 kg is suspended from a spring, which stretches by 8 cm. The support from which the spring is suspended is set into sinusoidal motion. At what frequehcy would you expect resonant behavior?
determine the kinetic energy of the ball at its highest point. Illustrate what is its speed when it is 9.0 m below its highest point.
Two race cars are traveling in the same direction, one in front ofthe other, 351 m apart, at a speed of69.2 m/s. The driver of the car in frontsounds his horn. How much time elapses before the other driverhears the horn?
A 5.0-, 0.732- wire is used to support two uniform 235- posts of equal length, What is the frequency of the sound this wire produces
A system consists of N particles that can occupy two energy levels: a nondegenerate ground state and a three-fold degenerate excited state, find the number of particles in the ground state and in the excited state
A fire breaks out and increases the Kelvin temperature of a cylinder of compressed gas by a factor of 1.0
An extension cord made of two wires of diameter 0.129 {rm cm} (no. 16 copper wire) and of length 1.5 m (5 ft) is connected to an electric heater which draws 13.5 A on a 120-{rm V} line. How much power is dissipated in the cord.
A wedge of mass m = 25.0 kg is located on a plane that is inclined by an angle ? = 20.6° with respect to the horizontal. What is the acceleration of the wedge along the plane
A window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 192 N and is 3.1 m long. What is the tension in each rope
Three uniform sticks, each of mass , are placed on the floor as follows: stick 1 lies along the axis from = 0 to = 2.0 , stick 2 lies along the axis from = 0 to = 2.0 , stick 3 lies along the axis from = 2.0 to =4.0 .
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