Physics, 28.01.2022 22:50, lieunekop8fm90
Question 8
A toy car has an initial acceleration of 2 m/s across a horizontal surface after it is released from rest. After the car travels for a time t = 5 seconds, the speed of the car is
25 m/s. Is the system consisting of only the car an open system or a closed system, and why?
Open system, because the acceleration of the car is not constant.
B
Open system, because an external force is applied to the car that causes it to accelerate.
Closed system, because the speed of the car is as expected in the case where an object has uniform acceleration for a time t.
>
Closed system, because mechanical energy was not removed from the system as a result of a net force.
Answers: 3
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Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?
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A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.
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Question 8
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