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A trebuchet was a hurling machine built to attack the walls of a castle under siege.
A large stone could be hurled against a wall to break apart the wall. The machine was not placed near the wall because then arrows could reach it from the castle wall. Instead, it was positioned so that the stone hit the wall during the second half of its flight. Suppose a stone is launched with a speed of v0 = 27.0 m/s and at an angle of θ0 = 42.0°.
What is the speed of the stone if it hits the wall (a) just as it reaches the top of its parabolic path and (b) when it has descended to half that height? (c) As a percentage, how much faster is it moving in part (b) than in part (a)?
Parallel plates are 5 mm apart and 2 m2 in area (you can roll the plates into a cylindrical geometry to make them more compact). A potential difference of 10 kV is applied across the capacitor. Find the capacitance of this parallel-plate capacitor
A long pipe of outer radius 3.60 cm and inner radius 3.06 cm carries a uniform charge density of 3.22 mC/m3. calculate the electric field r = 7.56 cm from the centerline of the pipe
a 180 lb man and a 120 lb woman stand side by side at the same end of a 300 lb boat ready to dive each with a 16 fts
A converging lens with a focal length of 20 cm and a diverging lens with a focal length of -70 cm are 110 cm apart. Calculate the distance between image and diverging lens
violet light and red light travel through air and strike a block of plastic at the same angle of incidence. the angle
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A 14 N horizontal force pushes a block weighing 3.0 N against a vertical wall, what is the force on the block from the wall
Consider two long straight parallel wires, each carrying 5 amps. These wires are 0.04 m apart. What is the magnitude of the magnetic field half way between these two wires
A hunter on a frozen, essentially frictionless pond uses a rifle that shoots 4.20 g bullets at 975 m/s. The mass of the hunter (including his gun) is 68.5 kg, and the hunter holds tight to the gun after firing it. a) Find the recoil velocity of the h..
A straight, stiff wire of length 1.00 m and mass 21g is suspended in a magnetic field B = 0.58T. The wire is connected to an emf. How much current must flow in the wire and in what direction so that the wire is suspended and the tension in the sup..
Two students stand opposite each other on the rim of the merry-go-round of 6m diameter and rotating at 12 rev/minute. Calculate the coriolis force on the ball
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