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A machinist with normal vision has a near point at 25 centimeter. The machinist wears eyeglasses in order to do close work. The power of the lenses is +1.75 diopters. With these eyeglasses, find the near point of the machinist?
A passenger on a Ferris wheel moves in a vertical circle of radius R=2.0 m with a constant speed v. Draw a free-body diagram, and find the upward force the seat applied to her at the top of the circle
The uncertainty in the position of an electron along an x axis is given as 56 pm, which is about equal to the radius of a hydrogen atom. What is the least uncertainty in any simultaneous measurement of the momentum component px of this electron?
What is the frequency of blue light that has a wavelength of 450 nm and What is the frequency of red light that has a wavelength of 650 nm
A string with a mass of 31 g and a length of 2 m is stretched under a tension of 67 N. How much power must be supplied to the string to generate a traveling wave that has a frequency of 51 Hz and an amplitude of 4 cm.
The intensity of sound wave A is 100 times that of sound wave B. Relative to wave B, find the sound level of wave A
A 20kg sled, initially at rest, slides down a hill, which is 20m tall. what is the speed of the sled at the bottom of the hill
A shotputter throws the shot with an initial spped of 15.5m/sat 34.0degree angle to the horizontal. Calculate the horizontal distance travelled by the shot
The Earth can be approximated as a sphere of uniform density, rotating on its axis once a day. The mass of the Earth is 5.97×1024 kg, the radius of the Earth is 6.38×106 m, and the time of rotation for the Earth is 24.0 hrs.
An air plane traveling at 201m/s makes a turn. what is the smallest radius of the circular path (in km) that the pilot can make and keep the centripetal acceleration under 5.0 m/s^2?
A uniform electric field of magnitude 600 N/C exists between two parallel plates that are 4.24 cm apart. Determine the distance from the positive plate at which the two pass each other. Ignore the electrical attraction between the proton and electr..
Assuming the sun to be a blackbody with a surface temperature of 6000K, Determine the loss in solar mass per day due to this radiation
For N2 at 25oC and 1.00 atm calculate the number of collisions per second made by one molecule; the number of collisions per second per cubic centimeter; compare these values to N2 at 25oC and 1.0*10^-6 torr using the values already calculated Show a..
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