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asked 2021-06-12
A uniform cable of weight w hangs vertically downward, supported by an upward force of magnitude w at its top end. What is the tension in the cable, a. At its top end b. At its bottom end c. At its middle? Your answer to each part must include a free body diagram. (Hint: For each question choose the body to analyze to be a section of cable or a point along the cable.) d. Graph the tension in the rope versus the distance from its top end.
Other
asked 2021-06-11
A stationary proton is in a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the proton?
Other
asked 2021-05-20
A 60.0 kg runner expends 300 W of power whilerunning. 10% of the energy is delivered to the musclesand 90% of the energy is primarily removed from the body bysweating. Determine the volume of bodily fluid( assume it'swater) lost per hour. (at 37.0 Celcius, the latent heatof evaporation of water is
\(\displaystyle{2.41}\times{10}^{{{6}}}\)
J/kg).
Other
asked 2021-05-20
Assume that a ball of charged particles has a uniformly distributednegative charge density except for a narrow radial tunnel throughits center, from the surface on one side to the surface on the opposite side. Also assume that we can position a proton any where along the tunnel or outside the ball. Let
\(\displaystyle{F}_{{R}}\)
be the magnitude of the electrostatic force on the proton when it islocated at the ball's surface, at radius R. As a multiple ofR, how far from the surface is there a point where the forcemagnitude is 0.44FR if we move the proton(a) away from the ball and (b) into the tunnel?
Other
asked 2021-05-19
In a certain chemical reaction the rate of conversion of asubstance is proprotional to the amount of the substance stillunreacted at that time. After 10 min one-third of the originalamount of the sustance has been reacted and 20g has been reactedafter 15min. What was the original amount of the substance?
Other
asked 2021-05-19
Forces F1=7.50N and F2=5.30N are applied tangentially to a wheel with radius 0.330m. What is the net trque on the wheel due tothese two forces for an axis perpendicular to the wheel and passingthrough its center.
Other
asked 2021-05-18
Lightning produces a maximum air temperature on the order of
\(\displaystyle{9.3}\times{10}^{{{3}}}{K}\)
, whereas a nuclear explosion produces a temperature on the order of
\(\displaystyle{9.2}\times{10}^{{{6}}}{K}\)
. Use Wien's displacement law to calculate the wavelength of the thermally-produced photons radiated with greatest intensity by each of these sources. Select the part of the electromagnetic spectrum where you would expect each to radiate most strongly.
(a) lightning
\(\displaystyle\lambda_{{\max}}\approx{n}{m}\)
b) nuclear explosion
\(\displaystyle\lambda_{{\max}}\approx\pm\)
Other
asked 2021-05-18
1. S1 and S2, shown above, are thin parallel slits in an opaqueplate. A plane wave of wavelength λ is incident from the leftmoving in a direction perpendicular to the plate. On a screenfar from the slits there are maximums and minimums in intensity atvarious angles measured from the center line. As the angle isincreased from zero, the first minimum occurs at 3 degrees. Thenext minimum occurs at an angle of-
A. 4.5 degrees
B. 6 degrees
C. 7.5 degrees
D. 9 degrees
E. 12 degrees
Other
asked 2021-05-18
A rifle that shoots bullets at 460 m/s is to be aimed at atarget 45.7 m away. if center of the target is level with therifle, how high above the target must the rifle barrel be pointedso that the bullet hits the dead center?
Other
asked 2021-05-18
A 10 henry inductor carries a steady current of 2 amp. How can a 100 volt self induced emf be made to appear in the inductor?
Other
asked 2021-05-18
The student engineer of a campus radio station wishes to verify the effectivencess of the lightning rod on the antenna mast. The unknown resistance
\(\displaystyle{R}_{{x}}\)
is between points C and E. Point E is a "true ground", but is inaccessible for direct measurement because the stratum in which it is located is several meters below Earth's surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance
\(\displaystyle{R}_{{y}}\)
. The procedure for finding the unknown resistance
\(\displaystyle{R}_{{x}}\)
is as follows. Measure resistance
\(\displaystyle{R}_{{1}}\)
between points A and B. Then connect A and B with a heavy conducting wire and measure resistance
\(\displaystyle{R}_{{2}}\)
between points A and C.Derive a formula for
\(\displaystyle{R}_{{x}}\)
in terms of the observable resistances
\(\displaystyle{R}_{{1}}\)
and
\(\displaystyle{R}_{{2}}\)
. A satisfactory ground resistance would be
\(\displaystyle{R}_{{x}}{<}{2.0}\)
Ohms. Is the grounding of the station adequate if measurments give
\(\displaystyle{R}_{{1}}={13}{O}{h}{m}{s}\)
and R_2=6.0 Ohms?
Other
asked 2021-05-18
What is the expected order of elution of the following compounds from a chromatography column packed with silica gel,eluting with hexane/ethyl acetate?
Other
asked 2021-05-17
Q.) A student has six textbooks, each 4.0 cm thick and 30 N inweight. What is the minimum work the student would have to do toplace the books in a vertical stack, starting with all the books onthe surface of the table?
Other
asked 2021-05-16
The normal boiling point of benzene is 80 degrees celsius.What is the vapor pressure of benzene at 80 degress celsius?
Other
asked 2021-05-16
What mass of steam at 100 C must be added to 1.00 Kg of ice at 0 C to yield liquid water at 20 C?
Other
asked 2021-05-16
A toaster rated at 1050 W operates on a 120V household circuitand a 4.00 m length of a nichrome wire as its heatingelement. The operating temperature of this element is 320degrees celsius.
What is the cross-sectional area of the wire?
Other
asked 2021-05-16
Look Out! A snowball rolls off a barn roof that slopes downward at an angle of 40 degrees . The edge of the roof is 14.0 m above the ground, and the snowball has a speed of 7.00 m/s as it rolls off the roof. Ignore air resistance.
A man 1.9 m tall is standing 4.0 m from the edge of the barn. Will he be hit by the snowball?
Other
asked 2021-05-16
An astronaut is tethered by a strong cable to a spacecraft. The astronaut and her spacesuit have a total mass of 101kg , while the mass of the cable is negligible. The mass of the spacecraft is 9.50
Other
asked 2021-05-16
A copper pot with mass 0.500 kg contains 0.170 kg of water ata temperature of
\(\displaystyle{20.0}^{\circ}\)
C. A 0.250-kg block of iron at
\(\displaystyle{85.0}^{\circ}\)
C is dropped into the pot. Find the final temperature, assuming no heat loss to the surroundings.
Other
asked 2021-05-16
Consider the curves in the first quadrant that have equationsy=Aexp(7x), where A is a positive constant. Different valuesof A give different curves. The curves form a family,F. Let P=(6,6). Let C be the number of the family Fthat goes through P.
A. Let y=f(x) be the equation of C. Find f(x).
B. Find the slope at P of the tangent to C.
C. A curve D is a perpendicular to C at P. What is the slope of thetangent to D at the point P?
D. Give a formula g(y) for the slope at (x,y) of the member of Fthat goes through (x,y). The formula should not involve A orx.
E. A curve which at each of its points is perpendicular to themember of the family F that goes through that point is called anorthogonal trajectory of F. Each orthogonal trajectory to Fsatisfies the differential equation dy/dx = -1/g(y), where g(y) isthe answer to part D.
Find a function of h(y) such that x=h(y) is the equation of theorthogonal trajectory to F that passes through the point P.
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