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You have made a raft to transport your fortune in gold across the lake. The raft is essentially a block of wood 20 cm deep and 5 meters square. The raft has a density of 600 kg/m^3. What is the maximum mass of gold you can carry without sinking the raft? (all of the raft just under water)
A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (17°C) at the ocean's surface, What is the maximum possible efficiency of the system
An electron of kinetic energy 1.56 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 21.8 cm. determine the circling frequency
A string of a violin is 32 cm long between fixed points with a fundamental frequency of 440 Hz and a mass per unit length of 7.2 x 10-4 kg/m. What are the wave speed and the tension in the string
A cannonball launched with an initial velocity of 161 m/s at the angle of 45 degrees follows a parabolic path and hits a balloon at the top of its trajectory. Neglect air resistance, how fast is it going when it hits the balloon? What is the accelera..
During a do-it-yourself roof repair project, you are on the roof of your house and accidentally drop your hammer, What is the horizontal distance traveled by the hammer between the instant it leaves the roof and the instant it hits the ground
Two cars are travelling on a desert road. After 5s, they are side by side at the next telephone pole. The distance between the poles is 70m.
A near-sighted person's eyeglasses has a focal length of ? 22.0 cm, and the lens is 1.8 cm from the eye. If the person switches to contact lenses that are placed directly on the eye, what should be the focal length of the corresponding contact len..
A charge Q = 23.0 ?C is distributed evenly on a wire bent into an arc of radius R = 47.0 cm, What is the electric field at the center of the arc that subtends ? = ±40.0°
If the 800-g car runs into a stationary 300-g car at the bottom of the ramp what is the velocity of the two cars after an inelastic collision?
Two point charges of -1microC and 2microC are separated by a distance of 0.30m. What is the electrostatic force on each particle
Two parallel plates are charged to a voltage of 50V. If the separation between the plates is 0.05m, what is the electric field between them?
What is the frequency of the small axial oscillations that electron will undergo if it is released along the z-axis near the origin.
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