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A football punter accelerates a football from rest to a speed of 8 m/s during the time in which his toe is in contact with the ball (about 0.26 s). If the football has a mass of 0.50 kg, what average force does the punter exert on the ball?
Mercury is poured into a U-tube as shown in Figure (a). The left arm of the tube has cross-sectional area A1 of 11.0 cm2, and the right arm has a cross-sectional area A2 of 4.60 cm2.
A 0.30-kg particle has a speed of 2.0 m/s at point A and kinetic energy of 7.5 J at point B. What is the total work done on the particle as it moves from A to B
A student sits on a rotating stool holding two 2.9-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s, Find the new angular speed of the student
If 100 gpm are flowing in the piping system below, and Gauge 1 reads 120psi and Gauge2 reads 94psi, how much pressure in psi is lost to friction
One of the first signs of sunburn is the reddening of the skin (called erythema). How many photons are incident on the skin in this amount of exposure
A weightlifter bench-presses a 130.0 kg barbell from his chest to a height equal the length of his arms 0.850 m. How many food calories does the weightlifter use if he does this lift 35 times
What is the least coefficient of friction between the beam and the wall for the beam to remain in static equilibrium.
A 10 kg block of metal is massed on a spring scale in air. What is the desnity of the metal
A 10kg mass that is moving at 15m/s hits a stationary 10kg mass. The collision is elastic. what is the total momentum BEFORE the collision
draw a motion diagram, using the particle model, showing the cars velocity vectors as seen from a helicopter hovering over the highway.
If an astronaut can throw a certain wrench 14 {rm m} vertically upward on earth, how high could he throw it on our moon if he gives it the similar starting speed in both places.
A woman who is late in her pregnancy often leans backwards slightly when getting out of chairs and even while walking. Why is the backpack helpful
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