Three blocks made of different materials are connected by string and placed on a

Question

Three blocks made of different materials are connected by string and placed on a flat surface. One of the blocks is known to have a mass of 2 kg, but the masses of the other two blocks are unknown (M1 and M2). The string between the two unknown mass blocks is 5cm long. The string between M2 and the 2kg block is 10cm long, the string attached to the 2kg block is 15cm long.

(a) Suppose friction is negligible between the blocks and surface. When you pull on the long string witha force of 30N, you measure the blocks accelerate at a rate of 3.0m/s^2. What does that tell you about the unknown masses.

(b) While you are pulling the long string with 30 N, what is the tension T2 in the medium string?

(c) While still pulling the long string with 30 N, what is the tension T2 of the medium string??

Suppose that the blocks are now placed on a different surface, and now there is some friction fore acting on the blocks toward the left as you pull them to the right. The friction force has magnitude 2.2 N, 3.0N and 1.4 N for the m1 and m2 and the 2kg blocks.

(d) When you pull on the long strung witha force of 30N, at what rate do the blocks accelerate?

(e) What is the tension T1 now?

Explanation / Answer

a) M1 + M2 = 10- 2 = 8 Kg b) T2 = 24 N c) T2 = 24 N d) 30 - 6.6 = 10 * a a= 2.34 m/s^2 e) T1 = 30 N

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.