Science Bowl Practice Questions

Physics - 4

20.

Short Answer: 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 UP

21.

Multiple Choice: If the distance between two objects, each of mass 'M', is tripled, the force of attraction
between the two objects is:

w) 1/2 the original force
x) 1/3 the original force
y) 1/9 the original force
z) unchanged

ANSWER: Y -- 1/9 THE ORIGINAL FORCE

22.

Short Answer: A 40 kilogram girl climbs a vertical distance of 5 meters in twenty seconds at a constant
velocity. How much work has the girl done?

ANSWER: 2000 JOULES or 1960 JOULES

23.

Short Answer: A machine performs 8 Joules of work in 2 seconds. How much power is delivered by
this machine?

ANSWER: 4 WATTS

24.

Multiple Choice: In physics, a radian per second is a unit of:

w) angular displacement
x) angular velocity
y) angular acceleration
z) angular momentum.

ANSWER: X -- ANGULAR VELOCITY

25.

Multiple Choice: If the resultant force acting on a body of constant mass is zero, the body's momentum
is:

w) increasing
x) decreasing
y) always zero
z) constant

ANSWER: Z – CONSTANT

26.

Short Answer: What is the name of the first American physicist to win two Nobel prizes?

ANSWER: (JOHN) BARDEEN

27.

Multiple Choice: Which of the following scientists is responsible for the exclusion principle which
states that two objects may NOT occupy the same space at the same time? Was it:

w) Heisenberg
x) Bohr
y) Teller
z) Pauli

ANSWER: Z -- PAULI