Question

PART C: Multiple Choice (1 mark each: total 20 marks) An airplane travelling due west experiences a uniform acceleration due to a wind directed south. Eventually, its velocity a. is directed south 1. b. may be directed south is directed south-west is directed west e. may be directed west r the A boat, while crossing a river, points directly north toward the opposite shore fo entire trip. The current is perpendicular to the direction the boat is pointing in. it will take to cross will be 2. The tr me a. more than if the boat was pointing at an angle somewhat upstream b. mor c. dependent on the strength of the current d. the same regardless of the current e. impossible to predict without more information e than if the boat was pointing at an angle somewhat downstream 3. In a competition to see who could throw a football the furthest (if wind resistance can be ignored), one should release the ball at an angle of a. 45° b. less than 45° c. greater than 45° d. 900 е, од If a 30.0 kg crate is pushed across a horizontal surface at a constant velocity, a. the force acting forward is greater than the force acting backward b the net force has a value directed forward c. the net force is zero d. the forces acting on the crate are "unbalanced e. there may be no force acting backward 4. 5. The action and reaction forces in Newton's third law a. act on the same object b. act on different objects c. are equal only when an object is at rest d. are equal only when an object is moving with uniform motion e. are equal only when the object is experiencing an unbalanced force A newton (N) can be represented with the base units: a. kg-m/s b. g cm/s C. kg.Szjm 6. d. kg m/s2 e. kg cm/s2

Answer 1

1When plane experience accleration towards south its velocity will be in south sorection also . So eventually it will have velocity component in south and west also .

So net velocity will be in south west direction

Option (c)

2)

Boat will take minimum time while crossing river perpendicular. So it doesn't not depend whether river is still or flowing .

Option ( d)

3) range depends on sin(2@) so at @= 45° sin(2@) = 1 ( maximum)

So option (a)

4) if velocity is constant then acceleration is zero ao net force also zero .

Option ( c)