A model aircraft internal-combustion engine produces 10 W of power. How much power is this in (a) lbf.ft/s and (b) hp?

A model aircraft internal-combustion engine produces $10 \mathrm{~W}$ of power. How much power is this in $(a) \mathrm{lbf} \cdot \mathrm{ft} / \mathrm{s}$ and $(b) \mathrm{hp}$ ?

Sketch each parabola. Identify the axis of symmetry. $y=5(x+0.3)^{2}-10$

What is the solution of the system?

$$\left\{\begin{aligned} 5 x+6 y &=-24 \\-2 x+3 y &=15 \end{aligned}\right.$$

F. (6, -1) G. (6, 1) H. (-6, 1) J. (-6, -1)

Lifting a weight to a height of 20 m takes 20 s for one crane and 10 s for another. Is there any difference in the amount of work done on the weight by each crane?

A water jet that leaves a nozzle at 60 m/s at a flow rate of 120 kg/s is to be used to generate power by striking the buckets located on the perimeter of a wheel. Determine the power generation potential of this water jet.

A man weighing 180 lbf pushes a block weighing 100 lbf along a horizontal plane. The dynamic coefficient of friction between the block and plane is 0.2. Assuming that the block is moving at constant speed, calculate the work required to move the block a distance of 100 ft considering (a) the man and (b) the block as the system. Express your answers in both $lbf \cdot ft$ and Btu.

Identify the sequence as arithmetic or geometric, and write a recursive formula for the sequence. Be sure to identify your starting value. $-101,-91,-81,-71, \dots$

Gasoline at 20°C flows at 105 m³/h in a 10-cm-diameter pipe. We wish to meter the flow with a thin-plate orifice and a differential pressure transducer that reads best at about 55 kPa. What is the proper β ratio for the orifice?

An insulated room is heated by burning candles. Is this a heat or work interaction? Take the entire room, including the candles, as the system.

A room is heated as a result of solar radiation coming in through the windows. Is this a heat or work interaction for the room?

Three drugs are being tested for use as the treat ment of a certain disease. Let

$$p_1, p_2$$

, and

$$p_3$$

represent the probabilities of success for the respective drugs. As three patients come in, each is given one of the drugs in a random order. After n = 10 “triples” and assuming independence, compute the probability that the maximum number of successes with one of the drugs exceeds eight if, in fact,

$$p_1 = p_2 = p_3 = 0.7$$

.

A room is heated by an iron that is left plugged in. Is this a heat or work interaction? Take the entire room, including the iron, as the system.

Consider a river flowing toward a lake at an average velocity of 3 m/s at a rate of 500 m^3/s at a location 90 m above the lake surface. Determine the total mechanical energy of the river water per unit mass and the power generation potential of the entire river at that location.