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You've been given the task of designing a "water couch"-that one could lie on, floating on a lake, for instance-in the form of a flat rectangular slab made of Styrofoam with a density of 85 kg/m 3 . What minimum volume must the slab have so that a 45 kg teenager can lie on top of the slab without getting wet? Optional extra credit (1 point): To explore the bottom of a 15-meter deep lake, your friend Jacques proposes to get a long garden hose, leave one end on land and the other in his mouth for breathing underwater, grab some hand weights and descend to the bottom of the lake to walk around down there. Explain why he will not be able to breathe that way, using a calculation or two (with approximations as needed) to support your argument.
How much is the spring compressed?
Two electric charges q1 = +10 ?C and q2 = -20 ?C are located 0.35 m apart. How much work is required to double the distance between the charges
A small button placed on a horizontal rotating platform with diameter 0.310m will revolve with the platform, How far from the axis can the button be placed, without slipping, if the platform rotates at 59.0rev/min
You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. What is the maximum horizontal range of your gun
When a 1.1 kg mass is hung from a spring it is found to stretch by 11 cm. The spring is stretched an additional 5 cm and released. What is the maximum potential energy
A person is nearsighted and can clearly focus on objects that are no farther than 2.6 m away from her eyes. What is the focal length of the borrowed glasse
A pair of slits separated by 1.3 mm, are illuminated with monochromatic light of wavelength 573 nm. What is the thickness of the glass
the maxium compresional stress that a bone can with stand is 1.6 * 10^8 N/m^2 before it breaks.What is the maxium compresional force that can be applied to the femur bone
The top layer of your goose down sleeping bag has a thickness of 5.4cm and a surface area of 1.0 m^2. What is the thermal conductivity of the goose down
A sign weighing 400N is suspended at the end of a 350N uniform rod that is hinged at the wall. What is the tention T in support cable
A bird, starting from its nest (we'll call that the origin), flies 24.0 km due southeast. It then changes directions and flies 26.0 km in a direction 60° north of east. Find the magnitude and direction of its resultant displacement.
A goldfish is swimming inside a spherical bowl of water having an index of refraction n = 1.333. determine the apparent distance of the goldfish from the wall
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