Constants Part A A 4.00 kg block is attached to a vertical rod by means of two s

Question

Constants Part A A 4.00 kg block is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended as shown in (Figure 1) and the tension in the upper string is 87.0 N. What is the tension in the lower cord? Express your answer in newtons to three significant figures T38.0 N Previous Answers Correct PartB Figure 1011 What is the speed of the block? Express your answer in meters per second to three significant figures 1.25 m 2.00 m 4.00 kg 37.5 m/s 125 m Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining

Explanation / Answer

part B:

here using pythagorus theorem

r^2 = d^2 - y^2

r^2 = 1.25^2 -1^2

r = 0.75 m

centripetal Force F = mv^2/r

Ftotal = F(upper) + F(lower)

thus

mv^2/r = 87 cos(arcsin(1/1.25)) + 38 cos(arcsin(1/1.25))

mv^2/r = 75

v^2 = 75 * 0.75/4

v = 3.75 m/s

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---