Physics MCQ series - 02

11.  Two forces have magnitudes of 11 newtons and 5 newtons.  The magnitude of their sum could NOT be equal to which of the following values?

w) 16 newtons

x) 5 newtons

y) 9 newtons

z) 7 newtons

ANSWER:   X -- 5 NEWTONS

12.  A ball leaves a girl's hand with an upward velocity of 6 meters per second.  What is the maximum height of the ball above the girl's hand?

ANSWER:   1.8 METERS

13.  A boy throws a ball vertically upward with a velocity of 6 meters per second.  How long does it take the ball to return to the boy's hand?

ANSWER:   1.22 SECONDS   (accept:  1.2 seconds)

14.   A toy train moves in a circle of 8 meters radius with a speed of 4 meters per second.  What is the magnitude of the acceleration of the train?

ANSWER:   2 METERS PER SECOND SQUARED

15.  A certain machine exerts a force of 200 newtons on a box whose mass is 30 kilograms.  The machine moves the box a distance of 20 meters along a horizontal floor. What amount of work does the machine do on the box?

ANSWER:   4000 JOULESScience Bowl PHYSICS

16.  A box is initially at rest on a horizontal, frictionless table.  If a force of 10 Newtons acts on the box for 3 seconds, what is the momentum of the box at the end of the 3 second interval?

ANSWER:   30 NEWTON-SECONDS  or   30 KILOGRAM-METER PER SECOND

17.  A block of metal which weighs 60 newtons in air and 40 newtons under water has a density, in kilograms per meter cubed, of:

w) 1000

x) 3000

y) 5000

z) 7000

ANSWER:   X – 3000

18.  A 10 kilogram body initially moving with a velocity of 10 meters per second makes a head-on collision with a 15 kilogram body initially at rest.  The two objects stick together.  What is the velocity of the combined system just after the collision?

ANSWER:   4 METERS PER SECOND

19. A certain spring is known to obey Hooke's Law.  If a force of 10 newtons stretches the spring 2 meters, how far will a 30 newton force stretch the spring?

ANSWER:   6 METERS

20. A helicopter is ascending vertically with a constant speed of 6 meters per second relative to the ground.  At the instant the helicopter is 60 meters above the ground it releases a package.  What is the magnitude and direction of the velocity of the package, relative to the ground, the instant the package is released by the helicopter? 

ANSWER:   6 METERS/SECOND UPScience Bowl PHYSICS

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