Answer:
c. 981 watts
Explanation:
Given:
- horizontal speed of treadmill,
- weight carried,
- grade of the treadmill,
<u>Now the power can be given by:</u>
(where grade is the rise of the front edge per 100 m of the horizontal length)
An object slides along a curved track of negligible friction, as shown in the figure. The potential energy U of the object as a
function of the position x is shown in the graph. The object starts at rest at x=0. Which of the following is a correct claim about the motion of the object?
(Would prefer an explanation, but it's not necessary)
A) The kinetic energy of the object is approximately the same at x=2m and x=5m.
B) At x=2m, the object has more potential energy than kinetic energy.
C) The object comes to rest when x=5.5m.
D) The rate of change of the potential energy is a minimum at x=0m.
E) The object achieves its maximum speed at approximately x=3m.
(Would prefer an explanation, but it's not necessary)
A) The kinetic energy of the object is approximately the same at x=2m and x=5m.
B) At x=2m, the object has more potential energy than kinetic energy.
C) The object comes to rest when x=5.5m.
D) The rate of change of the potential energy is a minimum at x=0m.
E) The object achieves its maximum speed at approximately x=3m.
1 answer:
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Answer:
v₁f = -5.7 cm/s
Explanation:
- Assuming no external forces acting during the collision, total momentum must be conserved, as follows:
- Rearranging terms, we have:
- We also know that the collision is elastic, so total kinetic energy must be conserved , as follows:
- Rearranging , and simplifying common terms, we have:
- Replacing by the givens, doing some algebra and dividing (4) by (2), we find the following relationship:
- Replacing the expression above in (1), as m₂ = 2*m₁, we can find the value of v₁f, as follows: