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Important information about Initial kinetic energy of the object
Point A is situated at the bottom of a rough plane which is inclined at 45 degrees to the horizontal. A body of mass 0.5 kg is projected from A along and up the line of greatest slope. The coefficient of friction between the body and the plane is 3/7. The body first comes to rest at a point B, at a distance 4*2^(1/2) from A, before returning to A.
What is the work does against friction when moving from A to B and the initial speed of the body?
What is the work done against friction when the body moves from A to B and back to A and the speed when it returns to A?
Thus, to eliminate the difficulties with motion sickness, designers must choose the distance between the astronaut's feet and the axis about which the space station rotates to be greater than a certain least value. What is this least value.
A Ferris wheel is a vertical, circular amusement ride with radius 6 m. Riders sit on seats that swivel to remain horizontal. The Ferris wheel rotates at the constant rate, going around once in 6.4 s. Consider a rider whose mass is 70 kg.
A Carnot engine operating with an ideal gas takes heat energy from the hot reservoir at 500 degrees C and exhausts heat energy to the cold reservoir at 250 degrees C. If the engine does 400J of work per cycle, what is its efficiency.
A thing, rigid, spherical shell with a mass of 4.00 kg and diameter of 0.200 m is filled with helium at 0 degrees celsius and 1 atm pressure. It is after that free from rest on the bottom of a pool of water that is 4.00 m deep.
If the perceived frequency becomes constant at 440 Hz, what is terminal speed at the paratrooper? Take the speed sound in air to be 343 m/s and assume the paratrooper always remains below the helicopter.
find out where the coyote lands in the canyon.
Approximate the position of both peaks 30 years after they were spilled. Estimate the expected future arrival time of both peaks at the water table.
Automobile Airbags. The human body can survive an acceleration trauma incident (sudden stop) if the magnitude of acceleration is less than 250m/s2.
A ferry boat transports tourists among three islands. It sails from the first island to the second island, 4.7 km away, in a direction 37.0° north of east. It then sails from the second island to the third island in a direction 69.0° west of north..
A potter's wheel having a radius 0.47 m and a moment of inertia 10.9 kg•m2 is rotating freely at 46 rev/min. The potter can stop the wheel in 7.0 s by pressing a wet rag against the rim and exerting a radically inward force of 68 N. Find out the effe..
Find out the height from which you would have to drop a ball so that it would have a speed of 9.7 m/s just before it hits the ground.
In a 100 m race, Maggie and Judy cross finish line in a dead heat, both taking 11.4s. Accelerating uniformly, Maggie took 1.80 s and Judy 2.90s to attain maximum speed, which they maintained for the rest of the race. What was Maggie's acceleration..
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