Homework Answers
1. A heat exchanger is a device used to transfer heat from one solid to fluid or fluid to fluid.
2.
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A crane is to lift a 1000 kg heat exchanger from the ground onto a 20...
8. A steel cable 31.75 mm in diameter and 15.24 m long is to lift a...
8. A steel cable 31.75 mm in diameter and 15.24 m long is to lift a 20,000 kg load without permanently deforming. What is the length of the cable during lifting? The modulus of elasticity of the steel is 207 Gpa. A 31.75 mm NEX) 15.24 m 6 .16 20,000 kg 09 10 i #5 66 kW 10? (10%)
A crane is being used to lift a container onto a cargo ship. The crane initially...
A crane is being used to lift a container onto a cargo ship. The crane initially lifts the container up with a constant positive (upwards is positive) acceleration, a l i f t . The crane then reduces the tension in the cable so that the container slows to a stop with a constant negative (downward) acceleration, a s t o p = - 3 a l i f t . Assume the acceleration goes directly from upwards to downwards...
A crane is being used to lift a container onto a cargo ship. You need to...
A crane is being used to lift a container onto a cargo ship. You need to program the crane so that it lifts the container with a constant positive acceleration, a, during the first half of the lift and with a constant negative acceleration of the same magnitude, -a, during the second half of the lift. You want to do this so that the maximum speed of the container during the lift is 8.1 m/s. The containers are initially at...
A crane is a type of machine mainly used to lift, lower, and horizontally move heavy...
A crane is a type of machine mainly used to lift, lower, and horizontally move heavy objects. It is immensely useful in construction works. In this problem, we will be analyzing a type of crane called a luffing crane. Cable Gantry 20 m 6 m 30 10000 N 30- Jib 10 m 20000 N Main mast Figure 1: a typical laffing crane As illustrated in fig. 1.a luffing crane typically consists of a main mast, a jib, a gantry and...
At a building site, a 1000 kg container hangs from a crane cable and is then...
At a building site, a 1000 kg container hangs from a crane cable and is then placed on the floor so that the cable is unloaded. The container is pushed to an elevator shaft, where it is to be lowered by the crane. By mistake, there is a 1-m slack in the cable from the crane when the container is pushed into the elevator shaft. Calculate the maximum stress in the cable if the cable has a cross-sectional area of...
A crane is being used to lift a container onto a cargo ship. You need to...
A crane is being used to lift a container onto a cargo ship. You need to program the crane so that it lifts the container with a constant positive acceleration, a, during the first half of the lift and with a constant negative acceleration of the same magnitude, -a, during the second half of the lift. You want to do this so that the maximum speed of the container during the lift is 7.85 m/s. The containers are initially at...
A crane is being used to lift a container onto a cargo ship. You need to...
A crane is being used to lift a container onto a cargo ship. You need to program the crane so that it lifts the container with a constant positive acceleration, a, during the first half of the lift and with a constant negative acceleration of the same magnitude, -a, during the second half of the lift. You want to do this so that the maximum speed of the container during the lift is 7.90 m/s. The containers are initially at...
A 1500-kg air conditioning unit is being lifted by a crane onto the roof of a...
A 1500-kg air conditioning unit is being lifted by a crane onto the roof of a building. The unit starts on the ground and is raised straight up to a height of 12.0 m by a cable attached to the crane. The tension in the cable during the lift is 1.54 × 104 N. (Reminders: a free body diagram will probably be helpful, and work can be positive or negative.) (a) How much work is done on the air conditioning...
A cable car weighs 2500 kg. The cable is made of steel of diameter 12 mm...
A cable car weighs 2500 kg. The cable is made of steel of diameter 12 mm (Young's modulus of steel is 207 GPa). a) What is the strain in the cable? b) What is the extension in the cable when the cable length is 2.4 m? c) If the yield stress of the steel cable is 300 MPa, how many people can get in the lift car? Assume average weight of one person = 65 kg and Factor of Safety...
A 1200-kg car is being raised with a constant acceleration of 2.53 m/s2 by a crane,...
A 1200-kg car is being raised with a constant acceleration of 2.53 m/s2 by a crane, using a 20-m long steel cable that is 1.5 cm in diameter. Young's modulus for steel is 2.0 × 1011 N/m2. What is the change in length of the cable caused by lifting the car?
8. A steel cable 31.75 mm in diameter and 15.24 m long is to lift a 20,000 kg load without permanently deforming. What is the length of the cable during lifting? The modulus of elasticity of the steel is 207 Gpa. A 31.75 mm NEX) 15.24 m 6 .16 20,000 kg 09 10 i #5 66 kW 10? (10%)
A crane is a type of machine mainly used to lift, lower, and horizontally move heavy objects. It is immensely useful in construction works. In this problem, we will be analyzing a type of crane called a luffing crane. Cable Gantry 20 m 6 m 30 10000 N 30- Jib 10 m 20000 N Main mast Figure 1: a typical laffing crane As illustrated in fig. 1.a luffing crane typically consists of a main mast, a jib, a gantry and...
A crane is being used to lift a container onto a cargo ship. You need to program the crane so that it lifts the container with a constant positive acceleration, a, during the first half of the lift and with a constant negative acceleration of the same magnitude, -a, during the second half of the lift. You want to do this so that the maximum speed of the container during the lift is 7.85 m/s. The containers are initially at...
A cable car weighs 2500 kg. The cable is made of steel of diameter 12 mm (Young's modulus of steel is 207 GPa). a) What is the strain in the cable? b) What is the extension in the cable when the cable length is 2.4 m? c) If the yield stress of the steel cable is 300 MPa, how many people can get in the lift car? Assume average weight of one person = 65 kg and Factor of Safety...
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