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the objective lens of the refracting telescope at the lick observatory in california has a focal length of 57 ft.
what is the refractive power of this lens?
what focal length (mm) eyepiece would give a magnification of 1000x for this telescope?

If vx = 7.00 units and vy = -7.60 units, determine the magnitude of v⃗ . determine the direction of v⃗ .

The 10-kg double wheel with radius of gyration of 125mm about o is connected to the spring of stiffness k = 600 n/m by a cord which is wrapped securely around the inner hub. if the wheel is released from rest on the incline with the spring stretched 225 mm, calculate the maximum velocity v of its center o during the ensuing motion. the wheel rolls without slipping

Which of the following is an example of motion in two dimensions?