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In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed should the athlete leave the ground in order to lift his center of mass 2.04m and cross the bar by a speed of 0.690m/s?
Neutron stars are so named because they are composed of neutrons and have a density the same as that of a nucleus. find the radius of a neutron star
A juniper-wood plank measuring 0.25 ft by 1ft by 16 ft istotally submerged in water. What is the size and the direction of the net force on it
Two conductors having net charges of +14.0 µC and -14.0 µC have a potential difference of 14.0 V between them. Determine the capacitance of the system
Imagine trying to build a portion of a draw bridge as in the following. The side towers reach h=100 meters high above the road level. what is the total tension in the lift wire
A student has built a 20-cm-long pinhole camera for a science fair project. She wants to photograph the Washington Monument, How far should she stand from the Washington Monument
The flywheel of a steam engine runs with a constant angular speedof 150 rev/min. When steam is shut off,the friction of the bearings stops the wheel in 2.7 h. How many rotations does the wheel make before stopping
Westerly winds coming off the Pacific Ocean rise over the Rocky Mountains, which rise to a height of approximately 15,000 feet (580 hPa). The air on the western side of the mountain range is at 800 hPa (T = 70F, r = 0.75), and will subside on the ..
A cube of metal has a mass of 0.347 kg and measures 3.13 cm on a side. Calculate the density and identify the metal
A 205 kg log is pulled up a ramp by means of a rope that isparallel to the surface of the ramp. The ramp is inclined at 30degrees with respect to the horizontal. The coefficient of kineticfriction between the log and the ramp is 0.900, and the log..
A 499 g air-track glider attached to a spring withspring constant 13.4 N/m is sitting at rest on a frictionless airtrack. What is the period of the subsequent oscillations
A 0.275 kg puck, initially at rest on a frictionless horizontal surface, is struck by a 0.220 kg puck that is initially moving along the x axis with a velocity of 2.18 m/s, Determine the velocity of the 0.275 kg puck after the collsion
the decomposition of n2o5 takes place in carbon tetrachloride at room temperature according to the equation2n2o5 soln
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