1.Suppose your parents are visiting and you all go for a walk. You walk north 25

Question

1.Suppose your parents are visiting and you all go for a walk. You walk north 25 m, then turn 60° to your right and walk another 34 m. How far are you from home at this point? Drawing a diagram may help.

A. 68 m

B.  51 m

C.  42 m

D. 59 m

2.Suppose a an 65 N object rests on a perfectly smooth (frictionless) horizontal surface. What is the minimum force needed to start the object moving?

A. 65 N

B. 6.6 N

C. 637 N

D.  any horizontal force greater than zero

3.Atwood's machine has two masses attached by a string suspended over a pulley as shown. If m1accelerates upwards after being released from rest, which best compares m1 and m2?

A. m1 < m2

B. m1 = m2

C. m1 > m2

D. cannot be determined

4.A block sliding down a fixed inclined plane slows to a stop. Which of the following is true?

A. A change in the normal force caused the block to stop.

B. The kinetic friction force was less than the component of the weight down the inclined plane.

C. The kinetic friction force was greater than the component of the weight down the inclined plane.

D. The static friction force overcame the kinetic friction force.

WILL RATE IMMEDIATELY , NEED ASAP. THANKS

Explanation / Answer

here,

1)

first displacement , d1 = 25 m j

d2 = 34 * ( sin(60) i + cos(60) j) m

d2 = 29.4 m i + 17 m j

the net displacement , d = d1 + d2

d = 29.4 m i + 42 m j

the magnitude of displacement , d= sqrt(d1^2 + d2^2)

d = sqrt(29.4^2 + 42^2 ) = 51 m

the magnitude of distance is B) 51 m

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