Q13 only please The mysterious sliding stones, Along the remote Racetrack Playa
ID: 1598276 • Letter: Q
Question
Q13 only please
The mysterious sliding stones, Along the remote Racetrack Playa in Death Valley, California, stones sometimes gouge out prominent trials in the desert floor, as if the stones had been migrating. For years curiosity mounted about why the stones moved. One explanation was that strong winds during occasional rainstorms would was that strong winds during occasional rainstorms would drag the rough stones over ground softened by rain. When the desert dried out, the trails behind the stones were hard-baked in place. According to measurements, the coefficient of kinetic friction between the stones and the wet plays ground is about 0.80. What horizontal force must act on a 20 kg stone (a typical mass) to maintain the stone's motion once a gust has started it moving? A 120 kg tortoise rushes across a 100 meter wide patch of 4 cm high grass in 3 minutes, 21 seconds. The grass scatters light with a wavelength of 532.34 mm. The tortoise concentrates with a total concentration of 120 concentration units. Heading for the safety of 4.3 meter tall trees that each weigh 1362 N, the tortoise does 30 kJ of work during its frantic dash. What is the average power output of the tortoise in this scenario? The force acting on a particle varies as shown in the graph. Find the work done by the force on the particle as it moves from x = 0 m to x = 4.00 m An object of mass 1.5 kg is moving at 2 m/s when it is located at the 1 m position (U = 5.0 J) on the potential energy curve. Which of the marked energies (A, B, C, D, and E) will the object not be able to reach? List all that apply. Bonus Question: Derive the work-kinetic energy law using integration and Newton's 2^nd law of motion.Explanation / Answer
Given Data,
Mass of the tortoise=120 Kg
width of patch=100m
Height of grass=4 cm
time taken by tortoise to pass the grass=3 min 21 seconds= 3*60+21= 201 seconds
work done by tortoise= 30KJ= 30,000 J
we know that ,
avg power output= (avg work done) / (time taken)
= 30,000 / 201 seconds
= 149.25 watts
hence,
avg power output of the tortoise in this scenerio= 149.25 Watts
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