A 20.0 kg box is suspended from a rope attached to the roof of an elevator. The
ID: 1411813 • Letter: A
Question
A 20.0 kg box is suspended from a rope attached to the roof of an elevator. The elevator is moving down at a constant speed of 20 m/s. Questions 20-22 refer to this situation. This situation is described by Newton's; First law. Second law. The tension in the rope: Is less than the weight of the box, Equals the weight of the box; Is greater than the weight of the box. The net force on the box is: Pointing up; Pointing down; Zero. The elevator in the previous passage is now still moving down but coming to a halt. Question 23-25 refer to this new situation This situation is described by Newton's; First law. Second law. The tension in the rope: Is less than the weight of the box, Equals the weight of the box; Is greater than the weight of the box. The net force on the box is: Pointing up; Pointing down; Zero Compared to their values on Earth, on the Moon G is the same; g is different; G is different, g is the same: G and g are both different; G and g are both the same. A 30-kg mass on the left is connected by a rope to a 20-kg mass on the right Both masses are on a horizontal surface The rightmost mass is pulled with a horizontal to of 400 N. Friction is negligible. Questions 27-29 refer to this situation. The acceleration of the system is: Less than 4.5 m/s^2; Between 4.5 m/s^2 and 9 m/s^2; Greater than 9 m/s^2.Explanation / Answer
20. First law
Newton's first law of motion states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force
21. The tension in the rope equals the weight of the box. The box is going down with zero accelaration. Since the tension is also zero it will equal.
22.zero. since no acceleration
23.
First law
Newton's first law of motion states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force
24
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