Boost Your Skills in Any Other Math or Physics Topic! - Page 111

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Chesley 2021-02-03

A 100kg cannon at rest contains a 10kgcannonball. when fired, the cannonball leaves the cannon with avelocity of 90m/s. what is the magnitude of the recoil speed of thecannon.

Dillard 2021-02-03

An upper-layer packet is split into 10 frames, each of which has an 80 percent chance of arriving undamaged. If no error control is done by the data link protocol, how many times must the message be sent on average to get the entire thing through?

Falak Kinney 2021-02-03

Lead has a work function of4.14 eV.
(a) Find the cutoff wavelength for the photoelectriceffect.
nm
Find the cutoff frequency for the photoelectric effect.
Hz
(b) Calculate the stopping potential if the incident light has awavelength of 179 nm.
V

Joni Kenny 2021-02-02

Write first and second partial derivatives
$f (x, y) = 2 x y + 9 x^{2} y^{3} + 7 e^{2 y} + 16$
a) $f_{x}$
b) $f_{x x}$
c) $f_{x y}$
d) $f_{y}$
e) $f_{y y}$
f) $f_{y x}$

ka1leE 2021-02-02

You have two springs that are identical except that spring 1 is stiffer than spring 2 (k1>k2). On which spring is more work done (a) if they are stretched using the same force, (b) if they are stretched the same distance?

Trent Carpenter 2021-02-02

The resistivity of gold is $2.44 \times 10 - 8 ? \times m$ at a temperature of $20^{\circ} C$ . Agold wire, 0.5 mm in diameter and 44 cm long, carries a current of 380 ma. The number of electrons per second passing a given crosssection of the wire, is closest to:
a. $2.4 \times 1018$
b. $2.8 \times 1014$
c. $1.2 \times 1022$
d. $2.4 \times 1017$
e. $6.3 \times 1015$

Burhan Hopper 2021-02-02

The table gives the midyear population of Norway, in thousands, from 1960 to 2010.
$\begin{array}{cc} Year & Population \\ 1960 & 3581 \\ 1965 & 3723 \\ 1970 & 3877 \\ 1975 & 4007 \\ 1980 & 4086 \\ 1985 & 4152 \\ 1990 & 4242 \\ 1995 & 4359 \\ 2000 & 4492 \\ 2005 & 4625 \\ 2010 & 4891 \end{array}$
Use a calculator to fit both an exponential function and a logistic function to these data. Graph the data points and both functions, and comment on the accuracy of the models. [Hint: Subtract 3500 from each of the population figures. Then, after obtaining a model from your calculator, add 3500 to get your final model. It might be helpful to choose $t = 0$ to correspond to 1960.]

sibuzwaW 2021-02-02

A 10.0 m long wire of mass 123 g is stretched under a tensionof 255 N. A pulse is generated at one end, and 20.0 ms later asecond pulse is generated at the opposite end. Where will thetwo pulses first meet?

tinfoQ 2021-02-02

How much current will be flowing through a57.0 m length of copper wire with radius5.7 mm if it is connected to a sourcesupplying 62.0 V? (The resistivityof copper is $1.68 \times 10^{- 8} ? \cdot m)$
Answer is in A.

Khaleesi Herbert 2021-02-02

Find a second-degree polynomial P such that $P (4) = 5$ , $P^{'} (4) = 3$ , and $P^{″} (4) = 3$

naivlingr 2021-02-01

Sketch all isomers of the following. Indicate clearly each pair ofenantiomers.
a) $[P t (N H 3) 3 C l 3] +$
b) $[C o (N H 3) 2 (H 2 O) 2 C l 2] +$
c) $[C o (N H 3) 2 (H 2 O) 2 B r C l] +$
d) $[C r (H 2 O) 3 B r C l I]$
e) $[P t (e n) 2 C l 2] 2 +$
f) $[C r (o - p h e n) (N H 3) 2 C l 2] +$
g) $[P t (b i p y) 2 B r C l] 2 +$
h) $F e (d t c) 3 d t c = S 2 C N (H) M e i)$
Re(arphos) $2 B r 2$ arphos $= 1, 2 - (M e 2 A s) (M e 2 P) C 6 H 4$
j) $R e (d i e n) B r 2 C l$
Wow... you don't really have to do all of them for me. Just some ofthem

Line 2021-02-01

Casting of molten metal is important in many industrialprocesses. Centrifugal casting is used for manufacturing pipes,bearings and many other structures. A veriety of sophisticatedtechniques have been invented. A cylindrical enclosure is rotated rapidly and steadily about a horizontal axis. Molten metal is poured into therotating cylinder and then cooled, forming the finished product.Turning the cylinder at a high rotation rate forces the solidifying metal strongly to the outside. Any bubbles are displace toward the axis, so unwanted voids will not be present in the casting. Sometimes it is desirable to form a composite casting, such as fora bearing. Here a stron steel outer surface is poured, followed byan inner lining of special low- friction metal. In some applications a very strong metal is given a coating of corrosion-resistan metal. Centrifugal casting results in stronbonding between the layers.
Suppose that a copper sleeve of iner radius 2.10 cm and outer radius 2.20 cm is to be cast. To eleminate bubbles and give high structural intgrity, the centripetal acceleration of each bit of metal should be 100g what rate of rotation is required? State theanswer in revolutions per minute.

Khaleesi Herbert 2021-02-01

One kind of battery used in watches contains mercury (II)oxide. As current is drawn, the mercury oxide is reduced tomercury.
$H g O (s) + H 2 O (l) + 2 e \to H g (l) + 2 O H - (a q)$
If a watch draws 1.0 X 10-5 amperes continuouslyfor 365 days, what mass of Hg(l) is formed? _______

Jason Farmer 2021-02-01

Any explanation of this problem?

usagirl007A 2021-01-31

Anthracene, a hydrocarbon obtained from coal, has an empericalformula of C7H5. To find its molecularformula, you dissolve 0.500g in 30.0g of benzene. The boilingpoint of pure benzene is 80.10 o C, whereas the solutionhas a boiling point of 80.34 oC . What is the molecularformula of anthracene?

cistG 2021-01-31

A 15-g bullet strikes and becomes embedded in a 1.10-kg block of wood placed on a horizontal surface just in front of the gun. If the coefficient of friction between the block and the surface is 0.25,and the impact drives the block a distance of 9.5 m before it comes to rest, what was the muzzle speed of the bullet. The muzzle speed sounds like it's the bullet's stopping velocity. I got $- 5.0 * 10^{4}$ for that, but the magnitude seems a little high.

ddaeeric 2021-01-31

An 80-mm-focal-length lens is used to focus an image on the film ofa camera. The maximum distance allowed between the lens andthe film plane is 120mm.
(a) How far ahead of the film should the lens be if the object tobe photographed is 10.0m away?
(b) 3.0m away?
(c) 1.0m away?
(d) What is the closest object this lens could photographsharply?

CoormaBak9 2021-01-31

A fine metal foil separates one end of two pieces of opticallyflat glass. When light of wavelength 670 nm is incident normally,28 dark lines are observed (with one at each end). How thick is thefoil?

postillan4 2021-01-31

The flatbed trailer carries two 3000-lb beams withthe upper beam secured by a cable. The coefficients of static friction between the two beams and between the lower beam and the bed of the trailer are 0.25 and 0.30, respectively. Knowing that the load does not shift, determine (a) the maximum acceleration of the trailer and the corresponding tension in the cable, (b) the maximum deceleration of the trailer.

Chesley 2021-01-31

Solve $[\begin{matrix} 6 & - 5 & 9 \\ - 4 & - 5 & 3 \end{matrix}] = 2 X - 5 [\begin{matrix} 2 & 1 & - 6 \\ - 6 & 6 & 3 \end{matrix}]$

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Sometimes students that seek algebra assistance come from non-Math subjects where logic and irrational numbers problems should be solved.

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