physics

An elevator starts from rest with a constant upward acceleration and moves 1m in the first 1.4 s. A passenger in the elevator is holding a 6.3 kg bundle at the end of a vertical chord. what is the tension in the chord as the elevator accelerates? The acceleration of gravity is 9.8 m/s^2. Answer in units of N

Im not sure if i solved this right, but here is my work:

6.3(9.8)=61.74 N

1. 👍 0
2. 👎 0
3. 👁 123
1. a = 1/1.4 = .714 m/s^2 upward acceleration

Total force on bundle = m(.714) = tension on string - m g

so tension = m (.714 + 9.8) = 66.2 N

1. 👍 0
2. 👎 0
posted by Damon
2. the acceleration is not right.
you need to use this equation:
Xf=Xi+Vi*t+(1/2)a*t^2
Xi=0,Vi=0,t=1.4,Xf=1,a=?
1=0+0(1.4)+(1/2)a(1.4^2)
1(2)= a(1.96)
2/1.96= a
1.0204 = a

Then you follow the rest of the equation
T = m(g+a)

1. 👍 0
2. 👎 0
posted by john

Similar Questions

1. Physics

A 645-kg elevator starts from rest. It moves upward for t = 3.13 s with a constant acceleration until it reaches its constant cruising speed of v = 1.26 m/s. It moved 2.75m during that time. a) What is the average power (W)is

asked by Sarah on December 14, 2011
2. Physics

An elevator starts from rest with a constant upward acceleration and moves 1 m in the ﬁrst 1.7 s. A passenger in the elevator is holding a 6.6 kg bundle at the end of a vertical cord. What is the tension in the cord as the

asked by Kaylin on January 28, 2013
3. Physics

An elevator starts from rest with a constant upward acceleration and moves 1m in the first 1.9 s. A passenger in the elevator is holding a 5.3 kg bundle at the end of a vertical cord. The acceleration of gravity is 9.8 m/s2 . What

asked by Cole on September 19, 2010
4. physics

An elevator starts from rest with a constant upward acceleration and moves 1m in the first 1.4 s. A passenger in the elevator is holding a 6.3 kg bundle at the end of a vertical chord. what is the tension in the chord as the

asked by alexa on July 4, 2011
5. physics

An elevator starts from rest with a constant upward acceleration and moves 1m in the first 1.4 s. A passenger in the elevator is holding a 6.3 kg bundle at the end of a vertical chord. what is the tension in the chord as the

asked by alexa on July 2, 2011
6. Physics

A(n) 563 kg elevator starts from rest. It moves upward for 3.18 s with a constant acceleration until it reaches its cruising speed of 1.96 m/s. The acceleration of gravity is 9.8 m/s 2 . Find the average power delivered by the

asked by Nick on December 20, 2012
7. physics

A 690 kg elevator starts from rest. It moves upward for 2.56 s with constant acceleration until it reaches its cruising speed, 1.84 m/s. What is the average power of the elevator motor during this period?, What is the power of the

asked by Joe on February 19, 2012
8. physics

A 690 kg elevator starts from rest. It moves upward for 2.56 s with constant acceleration until it reaches its cruising speed, 1.84 m/s. What is the average power of the elevator motor during this period? What is the power of the

asked by Harry on February 20, 2012