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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.
In the Bohr model of the hydrogen atom, the electron moves in a circular orbit of radius 5.3 x 10^-11 m with a speed of 2.2 x 10^6 m/s. Find the magnitude of the magnetic field that the electron produces at the location of the nucleus (treated as a ..
question1a small object with a mass of 420 mg carries a charge of 40.0 nc and is pending by a thread between the
A screw with 25 threads per centimeter is driven 1.49 cm into its fixture in 12.4 s with a cordless electric screwdriver. What is the average angular speed of the screwdriver
A small boat is headed for a harbor 30 km directly northwest of its current position when it is suddenly engulfed in heavy fog. The captain maintains a compass bearing of northwest and a speed of 9.8 km/h relative to the water. The fog lifts 3.0 h..
A hunter aims directly at the target (on the same level) 115 m away. If the bullet leaves the gun at a speed of 205 m/s, by how much will it miss target.
Select all that apply. Which is the following statements is true?
A football player with a mass of 89 kg and a speed of 2.1 m/s collides head-on with a player from the opposing team whose mass is 120 kg. Find the speed of the second player
A plastic bar that is 20 cm long passes a total charge of 5.0 nC distributed evenly along its length, Find the x component of the electric field at point (0.0m,0.10m)
What is the change in Marys potential energy. Find the final speed of the particle.
A proton is confined to a nucleus that has a diameter of 5.7 10-15 m. what is the minimum uncertainty in its momentum
The resistance of a bagel toaster is 14 ?. To prepare a bagel, the toaster is operated for one minute from a 120-V outlet. How much energy is delivered to the toaster
A 02385 mH inductor has a length that is four times its diameter. If it is wound iwth 10.3 cm^-1 truns per centimeter, what is the length? Answer in units of m.
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