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A 9.0 cm-diameter disk emits light uniformly from its surface. 20 cm from this disk, along its axis, is an 7.0 cm-diameter opaque black disk; the faces of the two disks are parallel. 20 cm beyond the black disk is a white viewing screen. The lighted disk illuminates the screen, but there’s a shadow in the center due to the black disk.
What is the diameter of the completely dark part of this shadow?
The current in a 100 watt lightbulb is 0.790A. The filament inside the bulb is 0.200mm in diameter. What is the current density in the filament
With a particular grating a doublet of the two wavelengths 731.3 and 732.1 nm is viewed in the third order at 9.3° to the normal and is barely resolved. Find the total width of the rulings in nanometers
An ideal spring with a spring constant of 25.0 N/m is suspended vertically. A 1.00 kg object is attached to the unstretched spring and released. It then performs oscillations in the form of simple harmonic motions. Determine the magnitude of the o..
A cork on the surface of a pond bobs up and down two times per second on ripples having a wavelength of8.20cm. If the cork is10.5m from shore, how long does it take a ripple passing the cork to reach the shore?
While the dried up seed pod of a scotch broom plant bursts open, it shoots out a seed with an initial velocity of 2.4 m/s at an angle of 60° above the horizontal.
To separate two pieces of paper whose area is 10 cm by 10 cm, you blow across them with an air speed of 2.40 m/s. What is the resulting force on each
Suppose a manufacturing plant has an average sound intensity level of 97.0 dB created by 25 identical machines. Find the total intensity created by all the machines
A 20cm radius ball is uniformly charged to 59 N/C, What is the ball's uniform charge density, What is the electric field strength at points 5, 10, and 20 cm from the center
Using the kinematic equation, prove that if two balls are released simultaneously from table, one with zero velocity and the other with a horizontal velocity, they would both reach the ground at the identical time.
Three point charges have equal magnitudes, two being positive and one negative. Calculate the magnitude of the net force
A flight attendant pulls her 64 N flight bag a distance of 370 m along a level airport floor at a constant velocity. The force she exerts is 45 N at an angle of 51° above the horizontal.
Springs, having stiffness k, 2k, 4k, 8k, 16k, and so on are tied in series. Find the effective stiffness of the system.
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