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Three sisters go skiing. Each has a mass of m = 50 kg. There are three different routes to the bottom. Route A: a constant slope of 3.81 degrees for 12,027 meters. Route B: a gentle slope of 1.83 degrees for 25,013 meters. Route C: a steep slope of 18.43 degrees for 2527 meters. Each sister takes one route, and each starts from rest at the top of the hill letting gravity do the work. Ignore friction.
(a) How much work does gravity do on each sister during the descent?
(b) How fast is each sister going when she reaches the bottom?
A 54-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.7 m/s, determine her altitude as she crosses the bar
You and the friend each drive 47.0 km. You travel at 87.0 km/h; your friend travels at 98 km/h. How long will your friend wait for you at the end of trip.
A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. By how much does the ball clear or fall short of clearing the crossbar
A fire truck attaches two fire hoses to a hydrant to fight a fire. Each hose has a diameter of 20 cm. What is the speed of the water in the fire hoses
Two capacitors, one 17.5 ?F and the other 12.2 ?F are connected in series across a 15 V battery. What is the charge stored on the 12.2 ?F capacitor
An elevator has a downward acceleration of 1 m/s2. A person, having a weight of 800 N as measured by a scale at rest on the ground, steps on a scale in the elevator. What does the scale read? A) 0 N. B) Approximately 80 N. C) Between 80 N and 800 ..
A person runs 3.0 miles to the northwest (45 degrees with respect to the WE line), then 3.5 miles south. What is the persons net displacement
A electron emits radiation of wavelength 255 nm Calculate the maximum kinetic energy of the electron ejected, Calculate the de Broglie wavelength of the ejected electron
The starter motor of a car engine draws an electric current of 42.0 A from the battery. The copper wire to the motor is 5.70 mm in diameter and 1.36 m long. How much electric charge passes through the starter motor
A 11.0-g wad of sticky clay is hurled horizontally at a 130-g wooden block initially at rest on a horizontal surface. what was the speed of the clay immediately before impact
A 1055 kg van, stopped at a traffic light, is hit directly in the rear by a 735 kg car traveling with a velocity of +2.25 m/s. What is the final velocity of each vehicle
A wheel of radius 0.390 m starts from rest and accelerates uniformly to an angular speed of 17.0 rad/s in 4.00 s. Calculate the angular displacement of the wheel
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