Questions asked
Jennifer Hudspeth
Numerade educator
What is the expected ground-state electron configuration of the recently discovered element with $Z=116 ?$
Umar Sohail Qureshi
You have a bucket containing an unknown liquid. You also have a cube-shaped wooden block that you measure to be 8.0 cm on a side, but you don't know the mass or density of the block. To find the density of the liquid, you perform an experiment. First you place the wooden block in the liquid and measure the height of the top of the floating block above the liquid surface. Then you stack various numbers of U.S. quarter-dollar coins onto the block and measure the new value of $h$. The straight line that gives the best fit to the data you have collected is shown in $\textbf{Fig. P12.86.}$ Find the mass of one quarter (see www.usmint.gov for quarters dated 2012). Use this information and the slope and intercept of the straight-line fit to your data to calculate (a) the density of the liquid (in kg/m3) and (b) the mass of the block (in kg).
Darshan Maheshwari
A sphere of charge $+Q$ is fixed in position. A smaller sphere of charge $+q$ is placed near the larger sphere and released from rest. The small sphere will move away from the large sphere with (A) decreasing velocity and decreasing acceleration (B) decreasing velocity and increasing acceleration (C) increasing velocity and decreasing acceleration (D) increasing velocity and increasing acceleration
Satyam Gupta
A ladder 10 ft long rests against a vertical wall. Let $ \theta $ be the angle between the top of the ladder and the wall and let $ x $ be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does $ x $ change with respect to $ \theta $ when $ \theta = \pi/3? $
Building Design Concrete sections for a new building have the dimensions (in meters) and shape shown in the figure. $$y = \frac { 1 } { 3 } \sqrt { 5 + x }$$ $$y = \frac { 1 } { 3 } \sqrt { 5 - x }$$ (a) Find the area of the face of the section superimposed on the rectangular coordinate system. (b) Find the volume of concrete in one of the sections by multiplying the area in part (a) by 2 meters. (c) One cubic meter of concrete weighs 5000 pounds. Find the weight of the section.
Paul Gabriel
A woman is standing in an elevator holding her 2.5 -kg briefcase by its handles. Draw a free-body diagram for the briefcase if the elevator is accelerating downward at 1.50 $\mathrm{m} / \mathrm{s}^{2}$ and calculate the downward pull of the briefcase on the woman's arm while the elevator is accelerating.
Which of these pairs of elements are comparable in the poset $\left(\mathbf{Z}^{+}, |\right) ?$ a) $5,15$ b) $6,9$ c) $8,16$ d) $7,7$
Ashwin Banarsee
How does a molecule differ from an atom?
Prabhat Tyagi
An electron is moving past the square well shown in Fig. 40.13. The electron has energy $E = 3U_0$ . What is the ratio of the de Broglie wavelength of the electron in the region x > L to the wavelength for $0 < x < L$?
Linda Hand
Find the area of the shaded region. $ r = \sqrt{\ln \theta} $, $ \; 1 \leqslant \theta \leqslant 2\pi $