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1. A unidirectional E-Glass fiber-epoxy composite material contains 61% by volume E-Glass fibers stressed under isostrain conditions. The E-Glass fibers have a tensile modulus of 10 x 106 psi, and a tensile strength of 0.35 x 106 psi. The epoxy matrix has a tensile modulus of 0.45 x 106 psi, and a tensile strength of 9.0 x 103 psi. What is the strength of the composite material and what fraction of the load is carried by the E-Glass fibers? 2. A simple plate capacitor can store 6.5 x 10-5 C at a potential of 10,000 V. What dielectric constant must the material between the plates have if their area is 6.0x10-5 m2 and they are 0.16 mm apart? 3. It is desired to produce 5 cubic yards of concrete with a ratio of 1:1.8:3.5 (by weight) of cement, sand, and gravel. What are the required amounts of the components if 5.5 gallons of water per sack of cement is to be used? Assume the free moisture contents of the sand and gravel are 3% and 0.75% respectively. The specific gravities of the cement, sand, and gravel are 3.15, 2.65, and 2.65 respectively. (1 sack of cement weighs 94lb, and 1ft3 of water=7.48 gallons). Give the answere for cement in sacks, the sand and gravel in pounds, and the water in gallons.
Wax An air-filled parallel-plate capacitor has acapacitance of 1.4 pF. The separation ofthe plates is doubled and wax is inserted between them. The new capacitance is 2.8 pF. Find the dielectric constant of the wax.
A 3.76 kg block located on a horizontal frictionless floor is pulled with a cord that exerts a force F=10.1 N at an angle = 19.0° above the horizontal, as shown. What is the speed of the block 3.90 seconds after it starts moving?
A truck of mass 2200kg leaves town moving at 25 m/s to the north. Outside town, the truck turns north-east and changes speed to 40 m/s. What is the change in the truck's momentum
A horizontal rope is tied from a house to a pulley and down to a paint bucket filled with sand. what is the mass of the bucket of sand
Katie and Emily are riding on a circular merry-go-round that has a radius of 5 m. Katie is on a horse that is 2.5 m from the center of merry-go-round and Emily is on a tiger that is 4.5 m from the center of the merry-go-round.
An earth satellite moves in a circular orbit with an orbitalspeed of 4300 m/s. Find the elevation of the satellite over the Earth surface
A uniformly charged wire or radius R1=0.02m runs down the axis of a cylinder of inner radius R2=0.06m. Find the electric field at the surface of the wire
What mass of water at 23.0 °C should be allowed to come to thermal equilibrium with a 1.57-kg cube of aluminium initially at1.50 multiplied by 102 °Cto lower the temperature of the aluminium to 69.8 °C? Suppose any water turned to stream subsequently..
Some bacteria are propelled by motors that spin hair-like flagella.A typical bacterial motor turning at a constant angular velocityhas a radius of 1.9x10-8m, How long does it take the motor to make one revolution
1.0•kg block is tied to a string that is wrapped around the rim of a pulley of radius 10•cm. Find the speed of the block after it has fallen through a height of 0.48•m
A subway train starts from rest at a station and accelerates at a rate of 1.53m/s2 for 13.9s. Find the total distance covered
Compute the AMA of a ramp used to move a wheelchair bound occupant 4m up if the combined mass of the wheelchair and the occupant is 90kg. the angle of inclination of the ramp is 20 degrees.
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