The Earth's atmosphere at sea level and under normal conditions has a pressure of 1.01x10^5 Pa,...
The Earth's atmosphere at sea level and under normal conditions has a pressure of 1.01x10^5 Pa, which is due to the weight of the air above the ground pushing down on it. How much force due to this pressure is exerted on the roof of a building whose dimensions are 10.2 m long and 14.5 m wide?
Homework Answers
Force on an area A due to a pressure P is given by
Area of the roof is
hence, force on the roof of the building is
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The Earth's atmosphere at sea level and under normal conditions
has a pressure of 1.01x10^5 Pa,...
Under normal atmospheric conditions, there exists a weak electric field near the earth's surface, pointing vertically...
Under normal atmospheric conditions, there exists a weak electric field near the earth's surface, pointing vertically downward, whose value is 150 N/C. Find the necessary charge on a 2.70 gram ping-pong ball so that the ball could levitate' in this field. In other words, the upward electrical force would just balance the downward gravitational force. Would the acquired charge need to be positive or negative?
Part 1 How fast do small water droplets of 0.23 um (23 x 108 m) diameter fall through the air under standard sea-level conditions? Assume the drops do not evaporate. Repeat the problem for standard...
Part 1 How fast do small water droplets of 0.23 um (23 x 108 m) diameter fall through the air under standard sea-level conditions? Assume the drops do not evaporate. Repeat the problem for standard conditions at 5000-m altitude. (a) For the condition that the droplets are falling at a constant velocity, what is the relation between the weight ofa drop W, the buoyancy force Fe, and the drag force F? (b) What is the expression for the weight of...
1. A Ferris wheel has a radius of 6 m and makes one revolution in 4seconds...
1. A Ferris wheel has a radius of 6 m and makes one revolution in 4seconds (i.e. onerevolution in approximately 12.6 seconds). A person with a mass of 50 kg is sitting on one of thebenches attached to the rim. What is the normal force acting on a the person at the highest pointof the rotating Ferris wheel? Approximate the acceleration due to gravity as 10 m/s2; on a Ferriswheel, the passengers are never upside down. 2. Consider what happens...
QUESTION 5 Assuming bicycle tires are perfectly flexible and support the weight of bicycle and rider...
QUESTION 5 Assuming bicycle tires are perfectly flexible and support the weight of bicycle and rider by pressure alone, calculate the total area of the tires in contact with the ground. The bicycle plus rider has a mass of 70 kg, and the gauge pressure in the tires is 5.4 105 Pa Express your answer in cm2 with 3 or more significant figures. QUESTION 6 How tall must a water-filed manometer be to measure blood pressures as high as 206...
Please answer exercise questions 2 & 7 and explain how you got the answers. 132 Homework...
Please
answer exercise questions 2 & 7 and explain how you got the
answers.
132 Homework 3 Due Tuesday January 29 (if possible...) Read sections 10-1 through 10-5. Chapter 10 Questions: 2, Exercise 2: A circular suction cup with a radius of 4.50cm has one atmosphere pushing down on one side, a force F pulling up, and a vacuum underneath. What is force F required to cancel the force of the (one) atmosphere of pressure? (Ans, between 600 and 700N,...
QUESTION 1 Which one of the following is a vector? Area Pressure Force Density QUESTION 2...
QUESTION 1 Which one of the following is a vector? Area Pressure Force Density QUESTION 2 Which one of the following is also the Sl unit for pressure? kgi(m.s2) kg.m/s2 kg.m/s kglm2 52 QUESTION 3 Gold is sold by the troy ounce (31.103 g) What is the volume of 14 troy ounce of pure gold? (Express your answer in cm with 3 or more significant figures) Density of gold 19.3 g/am QUESTION 4 The left side of the heart creates...
Encircle the correct answer for the following questions: • What is the hydraulic diameter of a...
Encircle the correct answer for the following questions: • What is the hydraulic diameter of a rectangular air ventilation duet whose cross section is 1 m by 25 cm? (a) 25 cm (b) 40 cm (c) 100 cm (d) 75 cm (e) 50 cm Oil = 0.1kg/ms, specific gravity= 0.9] flows through a 50-m-long smooth 8-cm-diameter pipe. The maximum pressure drop for which laminar flow is expected is approximately • • (a) 40 kPa (b) 50 kPa (c) 60 kPa...
CENTRE INDEX NUMBER SECTION B 30 marks] Calculate the discharge through a pipe of diameter 200...
CENTRE INDEX NUMBER SECTION B 30 marks] Calculate the discharge through a pipe of diameter 200 mm when the difference of pressure head between the ends of the pipe 500 m apart is 4 m of water. Take the value off= 0.009 in the formula hl= a) 19.5e/s b)2.0es e)03 m's d) 29.3 e/s 2. A scale 1:50 scale model of ship is towed through sea water at a speed of 1 ms. A force of 2 N is required...
L2 r. cunhinning moncones the spood of piston at the hepinning of the stonke in the...
L2 r. cunhinning moncones the spood of piston at the hepinning of the stonke in the cylinder cushimin decrees the speed of piston ot the beginning of the role in the und 2) Which Type of bydraulic finder has one piston connected to piston rud extended on both the a female clevis 1. Circular fans c. Trunnion all of the above Which of the following is used for mounting purpose in luydraulic cylinders? sides of the cylinder! 3. telescopic cylinder...
Under normal atmospheric conditions, there exists a weak electric field near the earth's surface, pointing vertically downward, whose value is 150 N/C. Find the necessary charge on a 2.70 gram ping-pong ball so that the ball could levitate' in this field. In other words, the upward electrical force would just balance the downward gravitational force. Would the acquired charge need to be positive or negative?
Part 1 How fast do small water droplets of 0.23 um (23 x 108 m) diameter fall through the air under standard sea-level conditions? Assume the drops do not evaporate. Repeat the problem for standard conditions at 5000-m altitude. (a) For the condition that the droplets are falling at a constant velocity, what is the relation between the weight ofa drop W, the buoyancy force Fe, and the drag force F? (b) What is the expression for the weight of...
QUESTION 5 Assuming bicycle tires are perfectly flexible and support the weight of bicycle and rider by pressure alone, calculate the total area of the tires in contact with the ground. The bicycle plus rider has a mass of 70 kg, and the gauge pressure in the tires is 5.4 105 Pa Express your answer in cm2 with 3 or more significant figures. QUESTION 6 How tall must a water-filed manometer be to measure blood pressures as high as 206...
Please
answer exercise questions 2 & 7 and explain how you got the
answers.
132 Homework 3 Due Tuesday January 29 (if possible...) Read sections 10-1 through 10-5. Chapter 10 Questions: 2, Exercise 2: A circular suction cup with a radius of 4.50cm has one atmosphere pushing down on one side, a force F pulling up, and a vacuum underneath. What is force F required to cancel the force of the (one) atmosphere of pressure? (Ans, between 600 and 700N,...
QUESTION 1 Which one of the following is a vector? Area Pressure Force Density QUESTION 2 Which one of the following is also the Sl unit for pressure? kgi(m.s2) kg.m/s2 kg.m/s kglm2 52 QUESTION 3 Gold is sold by the troy ounce (31.103 g) What is the volume of 14 troy ounce of pure gold? (Express your answer in cm with 3 or more significant figures) Density of gold 19.3 g/am QUESTION 4 The left side of the heart creates...
Encircle the correct answer for the following questions: • What is the hydraulic diameter of a rectangular air ventilation duet whose cross section is 1 m by 25 cm? (a) 25 cm (b) 40 cm (c) 100 cm (d) 75 cm (e) 50 cm Oil = 0.1kg/ms, specific gravity= 0.9] flows through a 50-m-long smooth 8-cm-diameter pipe. The maximum pressure drop for which laminar flow is expected is approximately • • (a) 40 kPa (b) 50 kPa (c) 60 kPa...
CENTRE INDEX NUMBER SECTION B 30 marks] Calculate the discharge through a pipe of diameter 200 mm when the difference of pressure head between the ends of the pipe 500 m apart is 4 m of water. Take the value off= 0.009 in the formula hl= a) 19.5e/s b)2.0es e)03 m's d) 29.3 e/s 2. A scale 1:50 scale model of ship is towed through sea water at a speed of 1 ms. A force of 2 N is required...
L2 r. cunhinning moncones the spood of piston at the hepinning of the stonke in the cylinder cushimin decrees the speed of piston ot the beginning of the role in the und 2) Which Type of bydraulic finder has one piston connected to piston rud extended on both the a female clevis 1. Circular fans c. Trunnion all of the above Which of the following is used for mounting purpose in luydraulic cylinders? sides of the cylinder! 3. telescopic cylinder...
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