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Water flows through a horizontal pipe of cross-sectional area10.0 cm^2 at a pressure of 0.250 atm. The flow rate is 1.00 *10^-3 m^3/s. At a valve, the effective cross-sectional areaof the pipe is reduced to 5.00 cm^2. What is the pressure at the valve?
q1. a 21-cm-long zero-resistance wire is pulled outward on zero-resistance rails at a steady speed of 1.0 in a 0.10
In astronomy, a parsec ( pc) is de ned as the distance at which an object with a size of 1 astronomical unit (AU) would subtend an angle of 1 arc-second
A system consists of two positive point charges, q1 and q2>q1. The total charge of the system is +62.0 μC and each charge experiences an electrostatic force of magnitude 85.0 N when the separation between them is .270 m. Find q1 and q2.
A 2.00-mol sample of hydrogen gas is heated at constant pressure from 302 K to 414 K. Calculate the energy transferred to the gas by heat
hree uniform meter sticks, each of mass , are placed on the floor as follows: stick 1 lies along the axis from = 0.210 m to = 1.21 m, Calculate the location of the center of mass of the meter sticks
A person tuning a piano plays a note and hits a tuning fork atthe same time. The fork plays a note of 288 Hz. If 3 beats areheard when the fork is struck, what possible frequenices is the piano playing?
In a game of pool, a cue ball with an initial velocity of 1.50 m/s directed to the right (along the +x-axis) collides with the five ball, Find the cue ball's final velocity
A soldier has a huge contraption that notches a large 4 kg arrow (it looks more like a lance) in a massive bow and uses a winch system to draw the arrow back to set the bow. What is the speed of the arrow
Planet A and Planet B are in circular orbits around a distant star. Planet A is 4.5 times farther from the star than Planet B. What is the ratio of their speeds
The density of a 3.0-m long rod can be described by the linear density function ?(x) = 135 g/m + 13.6x g/m2. find the center-of-mass of the rod
Suppose that the spin magnetic quantum number ms had three possible values, rather than two. how many electrons would it take to fill the K shell
An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 750 m, What is the distance between the two aircraft
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