Sunglasses having half-silvered mirrors
Some sunglasses have half-silvered mirrors on them (on the front). Why can the wearer see through them, but no one else can see her yes behind the glasses?
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A 23 kg crate rests on a 10 kg hand cart as shown. The center of mass of the combined crate/cart is at C. Calculate (a) The magnitude of force F. (b) the magnitude of the acceleration.
A color television set draws about 2.9 A when connected to 120 V. How much time is required for it to consume the same energy as the black-and-white model consumes in 1 hour?
The sample yielded a mean score of 53. Test the hypothesis that the training program has a significant effect on mechanical aptitude score. What is the standard error of the mean for this sample?
The 25-kg bar BD is attached to the two light links AB and CD and moves in the vertical plane. Also find the angular acceleration of the links at this position.
When theta reaches 60 degrees, the links have an angular acceleration and an angular velocity of 6 rad/s2 and 3 rad/s, respectively. For this instant calculate the magnitudes of the force F and torque M supported by the pin at E.
If a particular shipment of thousands of components actually has a 8% rate of defects, what is the probability that this whole shipment will be accepted? Round to three decimal places.
The inlet velocity is 5 ft/s and the inlet and exit cross-sectional areas are equal. Determine the quality and the velocity (ft/s) of the water at the exit.
A company purchases shipments of machine components and uses this acceptance sampling plan: Randomly select and test 20 components and accept the whole batch if there are fewer than 3 defectives.
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