Assume that 10 J/cm2 of the energy in sunlight can damage the human retina. The fovea is a small pit in the retina where vision is the sharpest. If the fovea has an area of 0.018 cm2, how many joules of the Sun’s energy would damage it?

Google Maps A submarine sends a sonar signal, which returns from another ship 7 seconds later. How far away is the other ship if the speed of sound in seawater is 1,530 meters/second? Next

A metal has a density of 8.5 g/cc. What will be the volume of one kilogram of the metal?

Iron is melted during the recycling process. (a) How much heat must be transferred to each kilogram of iron to bring it to its melting point, 1,536°C, from room temperature, 20°C?_________ J(b) About how many cups of coffee could you make with this much energy (1 cup = 73,600 J)? __________cups

As part of an exercise program, a woman walks south at a speed of 2.8 m/s for 46 minutes. She then turns around and walks north a distance 3,986 m in 50 minutes . What is the woman's average speed in m/s during her entire motion?

The recommended daily caloric intake is 2000 calories (8,400,000J). This is because this is the same value for how much the average body loses to heat and work in a typical day (your change in energy is zero because you take in the same amount of energy you lose).  A) If you lose a total of 8,400,000J (Qout+W=total lost), but consume 1200 calories of food (5,000,000J), what would your change in energy be? B) Assuming your change in energy is negative (hint-it should be), where does your body get the extra energy to maintain it's temperature?

As part of an exercise program, a woman walks south at a speed of 2.5 m/s for 59 minutes. She then turns around and walks north a distance 3,879 m in 46 minutes . What is the woman's average speed in m/s during her entire motion?

A team of biologists finds a mammoth frozen in permafrost. They analyze the fraction of Carbon-14 and Nitrogen-14 atoms in the mammoth.  They find that for every 1 Carbon-14 atom, there are 15 Nitrogen-14 atoms. Approximately how old is the mammoth?

you push a 10kg box with a force of 3 N over a distance of 4m. if 2 J of energy are lost as heat, how much kinetic energy does the box gain?

Iron is melted during the recycling process. (a) How much heat must be transferred to each kilogram of iron to bring it to its melting point, 1,536°C, from room temperature, 20°C?________J(b) About how many cups of coffee could you make with this much energy (1 cup = 73,600 J)? _____cips