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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.
If the mercury in this barometer is replaced with water, to what height does the column of water rise
Estimate the kinetic energy of the Mars with respect to the Sun as the sum of the terms, that due to its daily rotation about its axis
A physician is making an image with ultrasound of initial intensity 2000 W/m^2. What will be the intensity at this depth if the physician changes the frequency to 5.0 MHz
Illustrate what is the magnitude of the normal force exerted on the car by the walls of the cylinder at point B (at the top of the vertical circle)?
27 g of copper pellets are removed from a 300 C oven and immediately dropped into 120 mL of water at 21C in an insulated cup. What will the new water temperature be?
A 5.00-kg object is initially at rest. The object is acted on by a 9.00-N force toward the east for 3.00 s. No force acts on the object for the next 4.00 s. How far has the object moved during this 7.00 s interval
A car is being pulled out of the mud by two forces that are applied by the two ropes shown in the drawing. What angle would the single rope make relative to the dashed line
What is the terminal speed for an 79 skier going down a 36 snow-covered slope on wooden skis = 0.060? Assume that the skier is 1.8 m tall and 0.50 m wide.
A particular race car can cover a quarter mile track (402 m) in 6.20 s starting from a standstill. what horizontal force must the road exert on the tires
suppose you are stopped for a traffic light and a ambulance approaches you from behind with a speed of 18 m/s. what is the wavelenght of the sound reaching your ear
An engine of the orbital maneuvering system (OMS) on a space shuttle exerts a force of 2.64×104N j^ over a time interval of 4.50s, What is the impulse of the force for this time interval of 4.50 s
Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 44.0mph and half the distance at 65.0. What is her average speed on the return trip
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