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While surveying a cave, a spelunker follows a passage 190{\rm m} straight west, then 210{\rm m} in a direction 45.0^\circ east of south, and then 260{\rm m} at 30.0^\circ east of north. After a fourth unmeasured displacement, she finds herself back where she started. Use vector components to find the magnitude and direction of the fourth displacement.
A rifle with the barrel length of 62cm fires a 12g bullet with a horizontal speed of 380m/s. The bullet strikes a block of wood and penetrates to a depth of 14cm. What resistive force (assumed to be constant) does the wood exert on the bullet? How lo..
A small office building air conditioner operates on 250 V AC and consumes 3.88 kW, What is its effective resistance and How is energy related to power? Check units for consistency
The supersonic aircraft Concorde has a length of 62.2m when sitting on the ground on a typical day when the temperature is 12.0 oC. What is the temperature of the Concorde's skin in flight
How much charge does the battery supply to each plate.
A wooden raft has a mass of 45 kg. When empty it floats in water (density 1000 kg/m3) with 68% of its volume submerged. What mass of sand could be put on the raft without it sinking.
Two students are on a balcony 18.30 m above the street. One student throws a ball, b1, vertically downward at 16.80 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed.
A mass of 1.62 kg stretches a vertical spring 0.328 m. If the spring is stretched an additional 0.136 m and released, how long does it take to reach the (new) equilibrium position again.
a) Write an expression for the magnitude of the force, F, that propels the dragster forward in terms of the variables provided. b) If the track has length L, select the correct symbolic equation for how fast Vf the dragster is traveling when it fi..
An insulated Thermos contains 150cm3 of hot coffee at 83°C. You put a 12g ice cube at its melting point to cool the coffee. By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as although..
so hydrogen atoms have a thermal velocity of about 1000 m/s. How does the energy stored in the magnetic field compare with the kinetic energy in a given volume of space.
A beam of light enters a cube of flint glass (n = 1.65) at a 24 degree angle from the normal. Calculate the exact angles the light travels at
An Indy car with a speed of 120km/h goes around a level, circular track with a radius of 1km. What is centripetal acceleration of the car.
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