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A Newtonian telescope uses a curved mirror to focus light from a star. A flat mirror called a secondary mirror intercepts the converging light and redirects the light 90 degrees to the side of the telescope for viewing.
Determine the minimum size for the secondary mirror so that it collects all the light from a 200mm diameter mirror operating at f/6 for objects subtending up to 0.5 degrees. What is the focal length of an eyepiece that will give you an exit pupil diameter of 7mm?
A wire 3.00 m long and 0.450 mm2 in cross-sectional area have a resistance of 39 at 20°C. If its resistance increases to 39.7 Ω at 26.0°C, What is the temperature coefficient of resistivity
A horizontal magnetic field of 1.1×10?4 T is at an angle of 31 to the direction of the current in a straight, horizontal wire 80 cm long. If the wire carries a current of 18 A, what is the magnitude of the force on the wire
A parallel plate capacitor has a plate area of 2.5 m2, spacing of 0.52 mm, and dielectric material between the plates with k=9.8. How much energy is stored by the capacitor
A positively charged particle of mass 7.21E-8 kg is traveling due east with a speed of 85.3 m/s and enters a 0.340 T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 2.30E-3 s, at which time it leaves the fie..
A 75 kg passenger is seated in a cage in the Sling Shot, a carnival ride. Giant bungee cords are starched as the cage is pulled down, and then they rebound to launch the cage straight up.
(a) Calculate the number of gas molecules per cubic centimeter at this pressure. (b) What is the mean free path of the gas molecules if the molecular diameter is 2.12 x 10-8 cm.
An electron in a vacuum is first accelerated by a voltage of 21100 V and then enters a region in which there is a uniform magnetic field of 0.644 T at right angles to the direction of the electron’s motion.
A crate of mass 56 kg is attached to one end of a string, and the other end of the string runs over a pulley and is held by a person, what is the crate's acceleration
A typical ten-pound car wheel has a moment of inertia of about. What is the rotational kinetic energy of the rotating wheel
A 13.6 kg object on a horizontal frictionless surface is attached to a spring with k = 519 N/m. find the initial potential energy of the block-spring system
Two point charges of equal magnitude are 6.1 cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of 37 N/C
Compute the y-component of acceleration
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