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Question: The air is less dense at higher elevations, so skydivers reach a high terminal speed. The highest recorded speed for a skydiver was achieved in a jump from a height of 39,000 m. At this elevation, the density of the air is only 4.3% of the surface density. Estimate the terminal speed of a skydiver at this elevation. Suppose that the density of air at sea level is 1.2 kg/m3, the mass of the skydiver is 75 kg , and the cross section area of the skydiver is 0.72 m2.
A system does 4.30 104 J of work, and 7.00 104 J of heat flows into the system during the process. Find the change in the internal energy of the system
What is the magnitude of the torque about the point where the beam is bolted into place.
Analyse average density of the white dwarf
a soccer player kicks the ball toward a goal that is 25.0 m in front of him. the ball leaves his foot at a speed of
Two Stars of equal mass revolve in a circular orbit about a center of mass midway between them. Find the mass of each star
An ac generator with a frequency of 1.44kHz and an rms voltage of 25.2V is connected in series with a 1.80kohm resistor and a 300mH inductor. What is the power factor for this circuit
1) What was the original definition of kilogram? 2) What is the current definition of the kilogram based on? 3) What was the original definition of the second?
a 17.0-g piece of styrofoam carries a net charge of -0.75 microc and is suspended in equilibrium above the center of a
Estimate the change in COP of your electric food freezer when it is removed from your kitchen to its new location in your basement, which is 8 C° cooler than your kitchen. (Assume that the temperature in the kitchen is 20°C and that the temperature o..
A small glass bead charged to 7.4nC is in the plane that bisects a thin, uniformly charged, 10-cm-long glass rod, What is the total charge on the rod
A speed ramp at an airport is basically a large conveyor belt on which you can stand and be moved along. What is the speed at which the belt of the ramp is moving
Two equal size boxes, A and B, contain ideal gases. An inserted thermometer shows TA= 50°C and TB= 10°C. This is all we know about the gas in the boxes. Which of the following statements must be true? Could be true? Must be false? Explain your rea..
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