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A goldfish is swimming at 3.20 cm/s toward the front wall of a rectangular aquarium. The index of refraction of water is 1.333. Compute the apparent speed of the goldfish as measured by an observer looking in from outside the front wall of the tank?
A 20-m long steel wire (cross-section 1.0 cm^2, Young's modulus 2.0 ´ 10^11 N/m^2), is subjected to a load of 25 000 N. How much will the wire stretch under the load
What is the kinetic energy of a 1500 kg car traveling at a speed of 35 m/s (76 mph), Does your answer to part b depend on the car's mass
A winch is used to drag a 300 N crate up a ramp at a constant speed of 68.0 cm/s by means of a rope that pulls parallel to the surface of the ramp. If the rope were suddenly to snap, what would be the acceleration of the crate immediately after the..
A public transportation bus makes the position-time graph over a 5.00 hour interval shown below. What is the average velocity (magnitude and direction) of the bus
A flat slab of styrofoam, with a density of 32 kg/m3, floats on a lake. What minimum volume must the slab have
The pressure of a helium gas cylinder is 29.7 atm. After several balloons have been blown up the pressure is decreased to 5.68 atm. What fraction of the original gas remains in the cylinder?
The coefficients of kinetic and static friction between a 1000 lb refrigerator and flor are .4 and .45. when at rest the refrigerator is pushed with a horizontal force of 300 lb. what is the force of friction between the fridge and the floor?
A pair of flat mirrors meet to form a right angle. A beam of light is incident on one of them at a point 11.5 cm from their point of intersection, what is the angle of incidence at the first mirror
Youâ€TMre writing specifications for a new line of magnifying glasses that have double-convex lenses with equal 22.0cm curvature radii, What do you list for the focal length
shallow glass dish whose width w is 4.40 cm. When an observer's eye is placed as shown, the observer sees the edge of the bottom of the empty dish, Find the height h of the dish
a proton is sent into a region of constant magnetic field oriented perpendicular to the protons path. there the proton
A young hockey player stands at rest on the ice holding a 1.1 kg helmet. What is the mass of the hockey player
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