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A pole projects horizontally from the front wall of a shop. A5.1-kg sign hangs from the pole at a point 2.2m from the wall. What is the torque due to this sign calculated about the point where thepole meets the wall?
A 612 kg elevator starts from rest and moves upward for 4.00 s with constant acceleration until it reaches its cruising speed, 1.84 m/s. What is the average power of the elevator motor during this period
In her bathroom, Mindy has an overhead heater that consists of a coiled wire made of nichrome that gets hot when turned on. The wire has a length of 2.3 m when it is uncoiled. What is the resistance of the heater when it is turned on
A platinum resistance thermometer has resistances of 230.0 omegacap.gif when placed in a 0°C ice bath and 236.8 omegacap.gif, What is the melting point of this substance
Alpha particles (charge = +2e, mass = 6.68* 10^-27 kg) are accelerated in a cyclotron to a final orbit radius of 0.50 m. Determine the kinetic energy of an alpha particle in the final orbit
A certain type of laser emits light that has a frequency of 5.7 1014 Hz. How many wavelengths are there in one pulse
Two very large parallel plates are oppositely and uniformly charged. The field between the plates is 1.7×106N/C, How much total charge is on each plate if they are 18.0cm on a side
A sphere is charged with electrons to ?5 × 10?6 C. How many electrons make up this charge? The elemental charge is 1.6 × 10?19 C
Explain in detail how you can create an image by using a concave mirror. Give the three important rays which can be used to from the image.
Space vehicles traveling through Earth's radiation belts can intercept a significant number of electrons. The resulting charge buildup can damage electronic components and disrupt operations. Suppose a spherical metallic satellite 1.6 m in diamete..
A23.0-mW laser beam of diameter1.85mm is reflected at normal incidence by a perfectly reflecting mirror. Calculate the radiation pressure on the mirror
A DNA molecule (deoxyribonucleic acid) is 2.35 ?m long. The ends of the molecule be-come singly ionized so that there is ?1.60×10^?19 C on one end and +1.60 × 10^?19 C on the other. The helical molecule acts as a spring and compresses 1.50 percent..
A 270-m-wide river flows due east at a uniform speed of 3.5 m/s. A boat with a speed of 7.6 m/s relative to the water leaves the south bank pointed in a direction 25o west of north. What is the (a) magnitude and (b) direction of the boat's velocit..
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