A raft is made of 15 logs lashed together. Each is 41 cm in diameter and...

A raft is made of 15 logs lashed together. Each is 41 cm in diameter and has a length of 6.2 m .

How many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 70 kg ? Do not neglect the weight of the logs. Assume the specific gravity of wood is 0.60.

Expert Solution

genius_generous answered 2 years ago

A raft is made of 9 logs lashed together. Each is 41 cm in diameter and...

A raft is made of 9 logs lashed together. Each is 41 cm in diameter and has a length of 6.9 m. How many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 63 kg? Do not neglect the weight of the logs. Assume the specific gravity of wood is 0.61

1.) The femur of an elephant is about 90 cm long and 15 cm in diameter....

1.) The femur of an elephant is about 90 cm long and 15 cm in diameter. This is a scaling problem. The largest dinosaur probably weighed about 10 times as much as a large elephant. In this problem we will be discussing scaling. For reference, areas scale as length squared(A=L^2 for a square and A=3.14*r^2 for a circle) and volume scales as length cubed. To describe the size of a dinosaur's femur compared to that of an elephant's, the dinosaur's...

A nichrome wire is 15 cm long and has a diameter of 0.25 ??. a) What...

A nichrome wire is 15 cm long and has a diameter of 0.25 ??. a) What is its resistance? b) If a 3.0 V battery is connected across the wire, how much current flows? A wire is 0.4 m long and has a diameter of 1.2 × 10−4 ?. When a 3.0 V battery is connected across the wire, a current of 2.0 × 10−3 ? flows. Determine: c) the resistance of the wire d) the resistivity of the wire

A pure aluminum bar has a diameter of 15 cm and a length of 1.25 m....

A pure aluminum bar has a diameter of 15 cm and a length of 1.25 m. The rod is initially uniform in temperature at 300?C. The bar is now suddenly exposed to a convection environment at 50?C with h = 1250 W/m K. How long does it take the center to cool to a temperature of 80?C? (a) Determine if a lumped capacitance analysis is or is not appropriate. (b) Determine the cooling time assuming the lumped capacitance model is...

A disk is cast in an open mould with diameter 25 cm and height 15 mm....

A disk is cast in an open mould with diameter 25 cm and height 15 mm. The pouring temperature is 1200°C. Calculate the total heat evolved during cooling if the disk was cast in copper, and given that the heat of fusion is 200 kJ/kg.

2. Initially, the steel sphere with a diameter of 15 cm with a temperature of 200°C...

2. Initially, the steel sphere with a diameter of 15 cm with a temperature of 200°C was left to cool in the airflow at a temperature of 6 m/s. By making the necessary acceptances, calculate the amount of time the aluminum sphere will fall to a temperature of 50°C. The relevant correlation for forced transport on the sphere; NuD = 2 + (0.4 ReD 0.5+ 0.06 ReD 2/3) Pr 0.6 (μo/μy)1/4

A neon sign is made of glass tubing whose inside diameter is 2.5 cm and whose...

A neon sign is made of glass tubing whose inside diameter is 2.5 cm and whose length is 5.5 m. If the sign contains neon at a pressure of 1.73 torr at 37 ∘C, how many grams of neon are in the sign? (The volume of a cylinder is πr2h.) Express your answer using two significant figures.

A birthday candle is 2.5 inches long and 0.75 cm in diameter. It’s made of paraffin...

A birthday candle is 2.5 inches long and 0.75 cm in diameter. It’s made of paraffin wax, which is a mixture of various hydrocarbons, but for the sake of argument we’ll assume it’s all C31H64, since that’s the major component. Its density is 0.90 g/cm3 paraffin. If air is 20.95% O2 by volume, and the density of O2 is 1.43 g/L, then how many liters of air will the candle consume if it completely burns up? (Note that paraffin combines...

. A steam main (outside diameter of 16.8 cm and inside diameter of 15.4 cm) is...

. A steam main (outside diameter of 16.8 cm and inside diameter of 15.4 cm) is covered with 5-cm of high temperature insulation (k = 0.095 W/m. K) and 3.8 cm of lower temperature insulation (k = 0.07W/m. K). Calculate the heat loss from 150 m pipe assuming that inner and outer surface temperatures of the insulation are 450 and 30 °C, respectively. Also determine the temperature at the interface between two layers of insulation (10 points).

If the 2.00 cm diameter inlet tube narrows to 1.00 cm in diameter, what is the...

If the 2.00 cm diameter inlet tube narrows to 1.00 cm in diameter, what is the pressure drop in the narrow section for the 2.16 m/s airflow in the 2.00 cm section? (Suppose the air density is 1.25 kg/m3.) a. 20.3 Pa b. 11.7 Pa c. 45.7 Pa d. 43.7 Pa Two rigid objects, a ring and solid disc, have the same mass, radius and angular velocity. If the same braking torque is applied to each one, which takes longer...

Question