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Briefly answer the following questions.
(1) Is the visual sensation time longer or shorter when the intensity of light forming the image is weaker?
(2) We use a converging lens as the objective (focal length fo λ 25 cm) and a diverging lens as the eyepiece (focal length fe λ 5cm) to construct a simple Galilean telescope. What should be the distance between the lenses?
(3) Hold two illuminated pinholes at the anterior focal plane of the eyes, say, about 17 mm in front of the eyes.
Describe or draw what you see when two pinholes are separated by a distance equal to the diameter of the pupil.
What do you see when two pinholes are separated by a distance shorter than the diameter of the pupil?
Calculate the resultant velocity of an airplane that normallyflies at 200km/h if it encounters a 50-km/h tailwind. If itencounters a 50-km/h head wind
The sinusoidal wave shown in the figure below is traveling in the positive x-direction and has a frequency of 19.8 Hz. Find the speed of the wave
A block of wood weighs 50.0 Newton in air. A sinker is attached to the block, and the weight of the wood-sinker combination is 220 Newton when the sinker alone is immersed in water. Compute the density of the block
A cylindrical chamber, open at the bottom, is to be submerged in the ocean and used as a diving chamber, What will be the height h of the air in the cylinder
You have an uncharged capacitor (12 x 10-6 F) and a resistor (1000 ohms) connected to a battery of 200 V at time t=0 (the switch is closed at this time). What is the charge on the capacitor at this time
a bird flies 2.8rm km due west and then 2.7rm km due north. another bird flies 2.7rm km due west and 2.8rm km due
A platform is rotating at an angular speed of 2.1 rad/s. A block is resting on this platform at a distance of 0.33 meter from the axis. find the smallest distance from axis at which block can be relocated and still remain in place as the platform ro..
The airplane show is in level flight at an altitude if .50km and has a speed of 150km/h. At what distance d should it release a heave bomb to hit the target x
A glass optical fiber (n= 1.50) is submerged inwater(n=1.33). What is the critical angle for light to stay inside the fiber
a 2.10 x 102-n force is pulling an 85.0-kg refrigerator across a horizontal surface. the force acts at an angle of
a hydrogen atom is in the n=15 state. In the Bohr model, how many electron wavelengths fit around this orbit
A wedding ring is tossed into the air and given a spin, resulting in an angular velocity of 12.5 rotations per second. what is the diameter of the ring
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