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Two figure skaters, each weighing 120 pounds, are performing an artistic routine in which they are allowed to use a bungee cord. Initially both skaters are moving in the same direction, with the lead skater P moving 5 ft/s and the trailing skater Q moving 3 ft/s. The bungee cord acts just like a coil extension spring with constant k = 4 lbf/ft and its unstretched length is L= 6 ft. At first the cord is loosely dangling but then becomes taut and goes into tension as soon as the skaters' outstretched arms become separated by L What is the length of the bungee cord just as the two skaters reach matching speed? Assume that the skaters are only coasting along the frictionless ice (i.e., they are not using blade edges for traction)
A point on the outer rim of a tire on a moving vehicle exhibits uniform circular motion with a frequency of 28 Hz. calculate How fast is the car moving in km/hr
Find the moment of inertia of the plate for an axis that lies in the plane of the plate, passes through the center of the plate, and is perpendicular to the axis in part A
During a car crash a 65 kg person's head goes from travelling at 50 km ??!??to stationary in 0.15 s. What is the magnitude of the average net force acting on the person's 4.5 kg head
Binoculars denoted as 7 x 50 have a total magnification of 7 times and objective lenses of 50- mm diameter. What is the focal length of the eyepiece
Suppose the work function for a particular metal is 5.09 eV. Find the cut-off frequency for this metal
A current of 13.9 A flows through an electric heater operating on 120 V. What is the heater's resistance
A gun is fired vertically into a 2.00 kg block of wood at rest straight above it. If the bullet has a mass of 21.0 g and a speed of 198 m/s, how high would the block rise into the air after the bullet becomes embedded in it.
A rectangular block of ice 14.0 m on each side and 1.4 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3.
The temperature inside the refrigerator is 2.0 °C. It stands in a kitchen whose temperature is 22 °C, what is the entropy change of the kitchen
Suppose the solenoid filled with a paramagnetic substance such as liquid oxygen. Qualitatively,how will this change your your answer to Part (b)? Will your reply increase, decrease,or remain the same.
A woman throws a ball at a vertical wall d = 3.0 m away. The ball is h = 1.5 m above ground when it leaves the woman's hand with an initial velocity of 12 m/s at 45°.
A 100.0 m long rod with a diameter of 3.0 mm has a charge of 1032 C. What is the approximate electric field 3 mm from the surface of the rod
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