Lee y decide si estas afirmaciones sobre el año 1850 son ciertas (C) o falsas (F) 1.En el año 1850, la gente viajaba en tren, en barco o a caballo. 2.La gente veía programas de televisión y escuchaba la radio. 3.Había luces de gas para iluminar las calles. 4.Los chicos hablaban por teléfono con sus amigos. 5.No había teléfonos celulares.

For flow over a flat plate of length L, the local heat transfer coefficient $h_{x}$ is known to vary as $x^{-1 / 2}$, where x is the distance from the leading edge of the plate. What is the ratio of the average Nusselt number for the entire plate $\left(\overline{N u}_{L}\right)$ to the local Nusselt number at $x=L\left(N u_{L}\right)$?

Approximate to three decimal places

$$\cos 0.68$$

Air enters the compressor of a Brayton refrigeration cycle at $100\ \mathrm{kPa}, 260 \mathrm{~K}$, and is compressed adiabatically to $300\ \mathrm{kPa}$. Air enters the turbine at $300\ \mathrm{kPa}, 300 \mathrm{~K}$, and expands adiabatically to $100\ \mathrm{kPa}$. For the cycle (a) determine the net work per unit mass of air flow, in $\mathrm{kJ} / \mathrm{kg}$. and the coefficient of performance if the compressor and turbine isentropic efficiencies are both $100 \%$. (b) plot the net work per unit mass of air flow, in $\mathrm{kJ} / \mathrm{kg}$, and the coefficient of performance for equal compressor and turbine isentropic efficiencies ranging from $80$ to $100 \%$.

Find the sum of each infinite geometric series, if it exists. $\\$$0.27+0.0027+0.000027+\cdots$

Write as a decimal.

$5 \frac{1}{4}$%

A person pulls a toboggan for a distance of 35.0 m along the snow with a rope directed

$$25.0 ^ { \circ }$$

above the snow. The tension in the rope is 94.0 N. (a) How much work is done on the toboggan by the tension force? (b) How much work is done if the same tension is directed parallel to the snow?

The thermal efficiency of a reversible power cycle operating between hot and cold reservoirs is $20 \%$. Evaluate the coefficient of performance of (a) a reversible refrigeration cycle operating between the same two reservoirs. (b) a reversible heat pump cycle operating between the same two reservoirs.

Lamprino Appliance uses a perpetual inventory system. The following are three recent merchandising transactions:
June 10 Purchased 10 televisions from Mitsu Industries on account. Invoice price, $\$ 300$ per unit, for a total of $\$ 3,000$. The terms of purchase were $2 / 10, \mathrm{n} / 30$.
June 15 Sold one of these televisions for $\$ 450$ cash.
June 20 Paid the account payable to Mitsu Industries within the discount period.

Instructions
a. Prepare journal entries to record these transactions assuming that Lamprino records purchases of merchandise at:

1. Net cost
2. Gross invoice price

State the domain and range of the function.

$$f(x)=-2cos3x$$

Find the limit (if it exists), $\lim\limits_{x \to 2}\frac{\vert x-2\vert}{x-2}$.

state the domains and ranges of f and f^-1. f(x) = √x+1.

How does demand help societies determine WHAT, HOW, and FOR WHOM to produce?

Demand for a product means more than simply the desire to own it. Instead, demand includes desire and also the willingness and ability to buy the product. Firms often try to influence demand in a number of different ways. To see how, analyze a television, print, or online ad for a product. What devices has the seller used in the ad to stimulate demand for it? Pay attention to ways the seller may have made the product easier to buy.

Solve. If no solution exists, state this.

$$\dfrac{t}{10}+\dfrac{t}{15}=1$$