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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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