In Figure 1, a tension force F_T = 30 N pulls up on a 30 kg box, but does not ma

Question

In Figure 1, a tension force F_T = 30 N pulls up on a 30 kg box, but does not manage to lift it off the ground. What is the normal force on the box? a. 64 N b. 264 N c. 0 N d. 324 N If F_I = 50 N and mu_s = 0.8, will the box start moving? a. Yes b. No If F_I = 200.0 N and mu_k = 0.5, what is the net force on the box in the x-direction? a. 200.0 N b. 53.0 N c. 38.0 N d. 68.0 N If F_I = 200.0 N and mu_k = 0.5, what is the box's acceleration in the x-direction? a. 2.3 m/s^2 b. 6.7 m/s^2 c. 4.2 m/s^2 d. 1.8 m/s^2 Symbolically, what is the net force on the box in the y-direction? a. F_T - F_N + mg b. F_T - F_N - mg c. F_T + F_N - mg d. F_N - F_T - mg

Explanation / Answer

answers are:

1) b) 264N [ normal force = mg - Ft = 30x9.8 - 30 = 264N]

2) NO [Minimum force should be greater than 264N]

3) d) 68N [ 200 - mgu = 200 - 264x0.5 = 68N]

4) A) 2.3 m/s2 [a= 68/m]

5) c)

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