Average net force on the airplane
An airplane (mass=12,000 kg) is catapulted off an aircraft. what is the average net force on the airplane when it starts from rest and reaches a speed of 50 m/s in 70m?
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A particle is in simple harmonic motion with period T. At time t = 0 it is at the equilibrium point. At which of the following times is it furthest from the equilibrium point?
A 50.0-kg ballet dancer stands on her toes during a performance with four square inches (26.0 cm2) in contact with the floor. What is the pressure exerted by the floor over the area of contact (a) if the dancer is stationary and (b) if the dancer
A ladder 7.05 m long leans against the side of a building. If the ladder is inclined at an angle of 79.5° to the horizontal, what is the horizontal distance from the bottom of the ladder to the building?
A simple harmonic oscillator takes 12.0 s to undergo six complete vibrations. (a) Find the period of its motion.
What is the percent uncertainty in the volume of a spherical beach ball whose radius is r = 3.84 0.10 m?
What apparent free-fall acceleration is experienced by the managers remaining at the rim? Assume that the average mass for each inhabitant is 65.0 kg.
Write the number 2,500,000 light-years in scientific notation. Write the equivalent number of miles in scientific notation. Please show workings.
A hot (70^{circ}C) lump of metal has a mass of 250 g and a specific heat of 0.25 cal/g.^{circ}C. John drops the metal into a 500-g calorimeter containing 75 g of water at 20^{circ}C. The calorimeter is constructed of a material that has a specific
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