I think <span>its C
hope it helps
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Answer:
(a) 625 ft lb
(b) 468.75 ft lb
Explanation:
Work=Force* Distance
(a)
Force=wl/2 where w is uniformly distributed load of 0.5 lb/ft and l is the length of the rope
Force=0.5*50/2=12.5
Work=12.5*50=625 ft lb
(b)
Assuming that the weight of the rope is concentrated in two places, half is 12.5 feet down and the other half is 37.5 feet down. The center of mass of the top half is 12.5 feet down. The weight of the top half is 12.5
Work=work on top half + work on bottom half
Work on top half=12.5*(0.5*25)=156.25 ft lb
work on bottom half=12.5*(0.5*50)=312.5 ft lb
Total work=156.25+312.5=468.75 ft lb
I side more with B but a’s a good one
1. Answer;
Velocity decreases as it rises
Explanation;
When you project an object upward and release it at its initial velocity, it is moving in the opposite direction of the force of gravity. Thus the initial velocity is negative. The velocity of the object is also negative on the way up but positive on the way down.
2. Answer;
Velocity is 0 m/s at its highest point
Explanation;
The maximum height of the projectile is when the projectile reaches zero vertical velocity. From this point the vertical component of the velocity vector will point downwards.
The object slows down as it moves upward until it reaches a maximum height, at which time the velocity is zero. Then the velocity increases as the object falls toward the ground.
3. Answer;
-Acceleration is constant -9.8m/s^2
Explanation;
-An object that is thrown vertically upwards decelerates under the earth's gravity. Its speed decreases until it attains a maximum height, where the velocity is zero. Then it is accelerated uniformly downwards under gravity.
4. Answer;
-Acceleration is constant -9.8m/s^2
Explanation;
When a ball is thrown upwards the acceleration due to gravity remains constant throughout. It comes to rest for a moment at the highest point of motion just before returning back to earth.
-The acceleration due to gravity is constant on the object though out its flight. So the acceleration of the projectile is equal to the acceleration due to gravity, 9.81 meters/second/second, from just after its thrown, through its highest point, and until just before it hits the ground.
