91Ó°ÊÓ

When calculating the required length of a girder, an architect gets a value of \(14.8363 \mathrm{ft}\) on her calculator. What dimension should she put on the plans if it is customary to specify griders to the nearest hundredth of a foot?

Divide without using a calculator. Give your answer in scientific notation. $$\left(6 \times 10^{4}\right) \div 0.03$$

Evaluate each expression. Retain the proper number of significant digits in your answer. Fractional and Demical Exponents. $$(5.27)^{3.25}$$

A certain device (Fig. \(1-24\) ) consumes 18.5 hp and delivers 12.4 hp. Find its efficiency.

Evaluate each expression. Retain the proper number of significant digits in your answer. Fractional and Demical Exponents. $$(4.38)^{2.63}$$

Divide without using a calculator. Give your answer in scientific notation. $$\left(3 \times 10^{3}\right) \div\left(6 \times 10^{5}\right)$$

In the following exercises, substitute the given quantitics into the indicated formula from technology and finance. Using the formula for uniformly accelerated motion, an $$s=v_{0} t+\frac{a t^{2}}{2}$$ find the displacement s after \(t=1.30 \mathrm{s}\), of a body thrown downward with a speed \(v_{0}\) of \(12.0 \mathrm{ft} / \mathrm{s} .\) Take the acceleration \(a\) as \(32.2 \mathrm{ft} / \mathrm{s}^{2}\).

Evaluate each expression. Retain the proper number of significant digits in your answer. Fractional and Demical Exponents. $$(2.48)^{1.42}$$

An electric motor consumes \(1250 \mathrm{W}\). Find the horsepower it can deliver if it is \(85.0 \%\) efficient. \((1 \mathrm{hp}=746 \mathrm{W} .)\)

Divide without using a calculator. Give your answer in scientific notation. $$\left(8 \times 10^{-4}\right) \div 400,000$$