Two identical masses, A and B, slide down frictionless ramps, both starting at a height of 3M above the ground. Object A slides
1 answer:
Answer: c. Neither, they have the same speed.
In both the cases, there will be work done by the gravitational force. Since, the gravitational force is a conservative force, its work done does not depend on the path as it only depends on the initial and final position of the objects. Since, the initial and final positions are same for both the objects, the work done by gravitational force will be same in both the cases.
Hence, Work done by gravitational force = Change in the kinetic energy
So, the kinetic energy will be same for both the object.
Since, the masses are same: Kinetic energy =
Hence, the speed will also be same for both the objects.
Correct option: C
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<h2>Weight of astronaut 2450 miles above the Earth is 80.38 pounds</h2>
Explanation:
Given that gravitational force, F, between an object and the Earth is inversely proportional to the square of the distance from the object and the center of the Earth.
Where F is gravitational force between an object and the Earth, r is the distance from the object and the center of the Earth and k is a constant.
Radius of Earth = 4000 miles
In case 1 an astronaut weighs 209 pounds on the surface of the Earth,
Now we need to find weight of astronaut 2450 miles above the Earth
r = 4000 + 2450 = 6450 miles
Weight of astronaut 2450 miles above the Earth is 80.38 pounds