Two teams of nine members each engage in a tug of war. Each…
Two teams of nine members each engage in a tug of war. Each of the first team’s members has an average mass of 68 kg and exerts an average force of 1350 N horizontally. Each of the second team’s members has an average mass of 73 kg and exerts an average force of 1365 N horizontally. What is the acceleration of the two teams?
Read DetailsConversations with astronauts on the lunar surface were char…
Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person’s voice was so loud in the astronaut’s space helmet that it was picked up by the astronaut’s microphone and transmitted back to Earth. It is reasonable to assume that the echo time equals the time necessary for the radio wave to travel from the Earth to the Moon and back (that is, neglecting any time delays in the electronic equipment). Calculate the distance from Earth to the Moon given that the echo time was 2.56 s and that radio waves travel at the speed of light .
Read DetailsTwo teams of nine members each engage in a tug of war. Each…
Two teams of nine members each engage in a tug of war. Each of the first team’s members has an average mass of 68 kg and exerts an average force of 1350 N horizontally. Each of the second team’s members has an average mass of 73 kg and exerts an average force of 1365 N horizontally. What is the tension in the section of rope between the teams?
Read DetailsA beam has dimensions of b = 14 in., h = 28 in., and d = 25….
A beam has dimensions of b = 14 in., h = 28 in., and d = 25.5 in. and is reinforced with 3 No. 6 bars. The concrete strength is 8,200 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the compressive stress block is a = 0.811642 in. and the strain in the reinforcement is εs = 0.058265, determine the strength φMn for this beam. Assume the transverse reinforcement is not spirals.
Read DetailsA simply supported beam with dimensions of b = 10 in., h = 2…
A simply supported beam with dimensions of b = 10 in., h = 22 in., d = 19.5 in., and L = 19 ft supports a uniform service (unfactored) dead load consisting of its own weight plus 1.2 kips/ft and a uniform service (unfactored) live load of 1.5 kips/ft. The concrete is normal-weight concrete. Determine the moment due to the factored loads, Mu.
Read DetailsA beam has dimensions of b = 18 in., h = 30 in., and d = 27….
A beam has dimensions of b = 18 in., h = 30 in., and d = 27.5 in. and is reinforced with 5 No. 6 bars. The concrete strength is 4,000 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth to the neutral surface is c = 2.537486 in., determine the strain in the reinforcement.
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