Stacie Worsley
2021-12-16
Answered

An electron is accelerated from rest by a potential difference of 350 V. It then enters a uniform magnetic field of magnitude 200 mT with its velocity perpendicular to the field. Calculate (a) the speed of the electron and (b) the radius of its path in the magnetic field.

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asked 2021-03-07

Force F = (2.0 N) i - (3.0 N) k acts on a pebble with positionvector
r = (O.50 m) j - (2.0 m) k, relative to the origin. What isthe resulting torque acting on the pebble about

a.) the origin and

b.) a point with coordinates (2.0 m, 0, - 3.0 m)?

a.) the origin and

b.) a point with coordinates (2.0 m, 0, - 3.0 m)?

asked 2020-12-24

Water stands at a depth H in a large, open tank whose sidewalls are vertical. A hole is made in one of the walls at a depth h below the water surface.

a) at what distance R from the foot of the wall does the emerging stream strike the floor?

b) How far above the bottom of the tank could a second hole be cut so that the stream emerging from it could have the same range as for the first hole?

a) at what distance R from the foot of the wall does the emerging stream strike the floor?

b) How far above the bottom of the tank could a second hole be cut so that the stream emerging from it could have the same range as for the first hole?

asked 2021-02-18

In an industrial cooling process, water is circulated through a system. If the water is pumped with a speed of 0.45 m/s under a pressure of 400 torr from the first floor through a 6.0-cm diameter pipe, what will be the pressure on the next floor 4.0 m above in a pipe with a diameter of 2.0 cm?

asked 2021-02-19

Three Children are trying to balance on a seesaw, which consists of a fulcrum rock, acting as a pivot at the center, and avery light board 3.6 m long. Two playmates are already on either end. Boy A has a mass of 50kg, and girl B a mass of 35 kg. Where should girl C, whose mass is 25 kg, placed herself so as to balance the seesaw.

asked 2021-02-02

The table gives the midyear population of Norway, in thousands, from 1960 to 2010.

$\begin{array}{|cc|}\hline \text{Year}& \text{Population}\\ 1960& 3581\\ 1965& 3723\\ 1970& 3877\\ 1975& 4007\\ 1980& 4086\\ 1985& 4152\\ 1990& 4242\\ 1995& 4359\\ 2000& 4492\\ 2005& 4625\\ 2010& 4891\\ \hline\end{array}$

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.]

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

asked 2022-01-16

If A is a set, we can use the set notation

\(A=\{b∣property\ p_{1}\ of\ b\}\)

But say A is an element like b,

\(A=b∣property\ p_{1}\ of\ b\)

is this a usual notation? I am trying to say that A is a b that such that( ∣ ) it satisfies property \(\displaystyle{p}_{{{1}}}\) of b, and assume that exactly one b satisfies property \(\displaystyle{p}_{{{1}}}\).

Otherwise, is there a more usual convention to express this?

asked 2020-10-27

A restaurant that bills its house accounts monthly isconcerned about the average monthly bill exceeds $200 per account.A random sample of twelve accounts is selected, resulting in asample mean of $220 and a standard deviation of $12. The t-test isto be conducted at the 5% level of significance.

What is the calculated vaue and the critical value of t?

What is the calculated vaue and the critical value of t?