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An astronomer wishes to construct a telescope that will brighten point scourses by a factor of 16,900 times. If the human eye has an average diameter of about 0.5 cm what diameter should the telescope's primary lens/mirror be?
A 14.40 kg block and a 25.3 -kg block are resting on a horizontal frictionless surface. Between the two is squeezed a spring (spring constant = 1108 N/m).
A solid non conducting sphere has a radius of 50.0cm. What is the strength of the electric field at a distance of 25.0cm from the center of the sphere
two hockey players strike a puck of mass of .164kg, one from westward force of 1.10 x 10^3 Newtons, what is the degrees north of west
Proton in a well. Figure 24-51 shows electric potential V along an x axis.A proton is to be released at x = 3.6 cm with initial kinetic energy 4.0 eV. The scale of the vertical axis isset by Vs = 10.0V.
A fighter pilot dives his plane toward the ground at 230 m/s.He pulls out of the dive on a vertical circle. What is the minimun radius of the circle
A runaway railroad car, with mass 30 x 10^4 kg, coasts across a level track at 1.5 m/s when it collides with a spring loaded bumper at the end of the track, What is the maximum displacement of the spring after the collision
A cylindrical eraser of negligible mass is dragged across a paper at a constant velocity to the right by its pencil. The coefficient of kinetic friction between eraser and paper is 0.640. The pencil pushes down with 3.80N. Determine the shear modu..
Two point charges are located on the y-axis as follows: one charge = -1.35 located at -0.555 , and a second charge = 3.10 at the origin. What is the direction of the total force
A lens of focal length 15.0 cm is used to create an image of the Full Moon. What is diameter of the image
Two waves are traveling in the same direction along a stretched string. The waves are 45.0° out of phase. Find the amplitude of the resultant wave
A carbon resistor has a resistance of 18 ohm at a temperature of 20°C. The temperature coefficient of resistivity for carbon is -5.0 x 10-4 /C°. What is its resistance at a temperature of 120°C
What is the wavelength of radio waves. An electron in a TV is accelerated toward the screen across a potential difference of 54.2kV. How much kinetic energy does the electron gain while accelerating.
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