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A kettle containing 9kg of water reached its boiling point. How much energy, in joules, is required to boil the kettle dry?
An automobile club plans to race a 700kg car at the local racetrack. The car needs to be able to travel around several 155m radius curves at 87km/h.
A 0.180-kg yo-yo consists of two solid disks of radius 12.00cm joined together by a massless rod of radius 1.00 cm, Find the acceleration of the yo-yo
You are the technical consultant for an action-adventure film in which a stunt calls for the hero to drop off a 23.7-m tall building and land on the ground safely at a final vertical speed of 3.85 m/s. How many revolutions does the drum make during..
A 169× astronomical telescope is adjusted for a relaxed eye when the two lenses are 1.33 m apart. What is the focal length of each lens
the young modulus of a metal wire is 0.17 tpa and its cross-sectional area is .18mm2. the wire is extended by a force
A jet airplane is in level flight. The mass of the airplane is m = 8990 kg. What is the magnitude of the lift force acting on the plane
Suppose a star with radius 8.61 108 m has a peak wavelength of 686 nm in the spectrum of its emitted radiation. What is the surface temperature of the star
A 134g baseball moving 28.6 m/s strikes a stationary 5.20 kg brick resting on small rollers so it moves without significant friction. Find the total kinetic energy before the collision
An electron in a hydrogen atom is orbiting the nucleus at 2.2x106 m/s. If we treat the electron as a classical current loop orbiting the nucleus
It's possible to estimate the percentage of fat in the body by measuring the resistance of the upper leg rather than the upper arm; the calculation is similar. What are the fractions of muscle and fat in the leg
A bead slides without friction around a loop- the-loop. The bead is released from a height of 24.7 m from the bottom of the loop-the- loop which has a radius 9 m.
A plane touches down for a landing with a ground speed of 120 mi/h (53.7 m/s). What is the plane's acceleration while stopping
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