Questions asked
Nadia Khederoo
Numerade educator
If a point, ray, line, line segment, or plane intersects a segment at its midpoint, then what does it do to the segment?
Determine the electrostatic potential energy and the kinetic energy of an electron in the ground state of the hydrogen atom.
Leon Druch
Alzheimer's Disease The projected number of people aged 65 and over in the U.S. population with Alzheimer's disease (in millions) is given by the function $$P(t)=-0.0002083 t^{3}+0.0157 t^{2}-0.093 t+5.2 \quad(4 \leq t \leq 40)$$ where $t$ is measured in years, with $t=4$ corresponding to $2014 .$ What is the projected number of people aged 65 and over with Alzheimer's disease in $2030 ?$ In $2050 ?$
Bryan Valdivia
Collections of lymphoid tissue (MALT) that guard mucosal surfaces include all of the following except (a) appendix follicles, (b) the tonsils, (c) Peyer's patches, (d) the thymus.
Ashwin Banarsee
A 6.5-m ladder $A B$ leans against a wall as shown. Assuming that the coefficient of static friction $\mu_{s}$ is zero at $B$, determine the smallest value of $\mu_{s}$ at $A$ for which equilibrium is maintained.
The mass of an average blueberry is 0.75 $\mathrm{g}$ and the mass of an automobile is $2.0 \times 10^{3} \mathrm{kg}$ . Find the number of automobiles whose total mass is the same as 1.0 mol of blueberries.
Vroom, vroom! As soon as a traffic light turns green, a car speeds up from rest to 50.0 mi/h with constant acceleration 9.00 mi/h s. In the adjoining bike lane, a cyclist speeds up from rest to 20.0 mi/h with constant acceleration 13.0 mi/h s. Each vehicle maintains constant velocity after reaching its cruising speed. (a) For what time interval is the bicycle ahead of the car? (b) By what maximum distance does the bicycle lead the car?
Paul Gabriel
A baseball leaves a pitcher's hand horizontally at a speed of 161 km/h. The distance to the batter is 18.3 $\mathrm{m}$ . (a) How long does the ball take to travel the first half of that distance? (b) The second half? (c) How far does the ball fall freely during the first half? During the second half? (e) Why aren't the quantities in (c) and (d) equal?
Babita Kumari
In Exercises 51-64, find the slope-intercept form of the equation of the line that passes through the given point and has the indicated slope $m$. Sketch the line. $(0, -2)$, $m = 3$
The Pacific plate (the floor of the Pacific Ocean) near Hawaii is moving at about 0.000071 kilometer per year. This is about the speed at which a fingernail grows. Use scientific notation to determine how many kilometers the Pacific plate travels in one million years.