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Mary and Sally are in a foot race. When Mary is 22 m from the finish line, she has a speed of 4.0 m/s and is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, deaccelerates at a constant rate of 0.40 m/s2 to the finish line. What constant acceleration does Mar now need during the remaining portion of the race, if she wished to cross the finish lie side by side with Sally?
A cart for hauling ore out of a gold mine has a mass of 427 kg, including its load. Find the work that the donkey performs on the cart during this process
A cargo plane unloads crates of supplies at the site of humanitarian disaster. How long does it take each create to slide down the ramp
Atypical sprinter speeds up through the first third of a race and slows gradually over the rest of course. Is it accurate to say that a sprinter is accelerating as he slows through the final two-thirds of the race?
An ice chest at a beach party contains 12 cans of soda at 2.41°C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 9.97-kg water melon at 23.5 °C to the chest.
His arm is 70 cm long and has a mass of 4.0 kg. Evaluate the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor?
What is the minimum coefficient of friction between tires and road.
A uniform, solid, spherical asteroid with mass 1.2 multiplied by 1013 kg and radius 1.0 km isrotating with a period of 5.5 hours. Ameteoroid moving in the asteroid's equatorial plane crashes intothe equator at 8.4 km/s.
a 20.00 kg lead sphere is hanging from a hook by a thin wire 3.40 m long and is free to swing in a complete circle.
Assuming that the sound frequency is 523 Hz, how many wavelengths of sound are contained in this distance?
block of wood floats in fresh water with 0.651 of its volume V submerged and in oil with 0.890 V submerged. Find the density of the wood and the oil
A projectile is fired at an upward angle of 45° from the top of a 308m cliff with a speed of 198 m/s. What will be its speed while it strikes the ground below? (Use conservation of energy.)
a particle with charge q is at rest when a magnetic field is suddenly turned on. the field points in the z-direction.
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