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A presbyopic (farsighted) eye has a near point of 100 cm away. What type of lens is needed to permit the eye to see clearly objects 25 cm away, and what focal length should such a lens have An object is placed 3 cm from a lens. The image is found to lie 12 cm from the lens, on the same side as the object What is the focal length f of the lens, and is the image upright or inverted?
if the electric field inside a capacitor exceeds the dielectric strength of the dielectric between its plates the
Rod ABD is guided by wheels at A and B that roll in horizontal and vertical tracks. Knowing that at the instant shown n ß =60° and the velocity of wheel B is 800 mm/s downward, determine
The potential in a region between x = 0 andx = 6.00 m is V = a + bx wherea = 15.0 V and b =-5.00 V/m.Determine the potential at x =0. Determine the potential at x = 3.00 m.
The person;s gold wedding ring is stuck on his finger, and he must remove it. Find how much must the temperature of the ring be increased for it to slide past the knuckle
An Airbus A310 is initially moving down the runway at 4.5 m/s preparing for takeoff. The pilot pulls on the throttle so that the engines give the plane a constant acceleration of 1.6 m/s2
A car of mass 1,800 kg is initially traveling at a speed of 15 m/s. Calculate the change in the kinetic energy of the car
Attached to each end of a thin steel rod of length 1.10 m and mass 6.00 kg is a small ball of mass 1.02 kg. The rod is constrained to rotate in a horizontal plane about a vertical axis through its midpoint. At a certain instant, it is rotating at ..
What actually causes a Cepheid to vary in apparent brightness?
A uniform horizontal beam has a mass of 241 kg and is 10.5 meters long. The beam also carries the following three loads: Load A: 4715 N, 1.26 meters from left end, What are the forces supporting the two ends of the beam
A sphere of radius 20 cm and mass 1.8 kg starts fromrest and rolls without slipping down a 30 deg incline that is 10 mlong. Calculate its rotational speed when it reaches the bottom
An asteroid is discovered heading straight toward Earth at 13 . An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 , after which the asteroid is moving at 29 to its original path at a speed of 18..
You measure the period of your heartbeat on a particular EKG graph to be 0.9451 ± 0.06576 seconds. What is your heart rate in beats per minute
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