physics final mcqqqq

C) 1.5 L

D) 0.48 kg/L

B) 10m i - 3m j

C) C = -1.0 i - 1.0 j + 1.0 k

C) 0.25 m/s east

D) 4.0 m/s

D) (6 m/s²)t + 4 m/s

B) 22.5 m

D) None of the above

A? (quiz 3)

C) (30 m/s³)t i + (6 m/s²) j

A) 1 s

D) 34 m

D) 8a_c

C) 80 N along the + x-direction

17. Suppose an object of mass m sits on an incline plane (Figure 1) that makes an angle θ with the horizontal floor. What is the magnitude of the normal force?

(a) mgsin θ

(b) mgtan θ

(c) mgcos θ

(d) Insufficient information for this problem

C) mgcos θ

18. Compute the tension T in the diagram, Figure 2.

(a) 30 N

(b) 21 N

(c) 42 N

(d) None of the above

A) 30 N

19. Consider the pulley system in Figure 3. What is the acceleration of the 10 kg mass?

(a) 3.3 m/s2

(b) 6.6 m/s2

(c) 9.8 m/s2

(d) None of the above

A) 3.3 m/s²

20. See Figure 4. Box 1 has a mass of 10 kg and box 2 has a mass 20 kg. If the two boxes accelerate to the right at 1 m/s², what is the magnitude of the force that box 2 exerts on box 1?

(a) 10 N

(b) 20 N

(c) 30 N

(d) None of the above

B) 20 N

21. In Figure 5, θ = 30.degrees and m1 = m2 = 2.0 kg. Find the coefficient of static friction that keeps the masses stationary.

(a) 0.014

(b) 0.58

(c) 0.5

(d) None of the above

B) 0.58

A) 10 N

A) Yes

B) 159 m

C) 7 m/s

B) 10/3 J

A) 0

B) 90

B) 28 m/s

B) x = 0, unstable

C) 25 J

D) 35 J

46. What is the acceleration of the 10 kg mass in Figure 6?

(a) 9.8 m/s2

(b) 0.9 m/s2

(c) 1.6 m/s2

(d) None of the above