If the distance between two objects, each of mass 'M

Q-1; 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

Q-2; 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
PHYS-91; Short Answer: A machine performs 8 Joules of work in 2 seconds. How much power
is delivered by this machine?
ANSWER: 4 WATTS

Q-3; 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

Q-4; 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

A box is initially at rest on a horizontal, frictionless table. If a force of

Q-1; Short Answer: 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

Q-2; Multiple Choice: 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

Q-3; Short Answer: 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

Q-4; Short Answer: 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

Q-5; 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

A pendulum which is suspended from the ceiling of a railroad car is observed to hang at an angle of 10 degrees

Q-1; Multiple Choice: A pendulum which is suspended from the ceiling of a railroad car is
observed to hang at an angle of 10 degrees to the right of vertical. Which of the following
answers could explain this phenomena?
w) The railroad car is at rest.
x) The railroad car is accelerating to the left.
y) The railroad car is moving with constant velocity to the right.
z) The railroad car is accelerating to the right.
ANSWER: X -- THE RAILROAD CAR IS ACCELERATING TO THE LEFT.

Q-2; Multiple Choice: 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

Q-3; Short Answer: 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

Q-4; Short Answer: 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)

Q-5; Short Answer: 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

Q-6; Short Answer: 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 JOULES

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

Q1; 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

Q2; 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

Q3; Short Answer: A machine performs 8 Joules of work in 2 seconds. How much power is delivered by this machine?
ANSWER: 4 WATTS

Q4; 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

Q5; 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

A box is initially at rest on a horizontal, frictionless table. If a force of 10 Newtons acts on the box for 3 seconds

Q1; Short Answer: 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

Q2; Multiple Choice: 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

Q2; Short Answer: 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

Q3; Short Answer: 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

Q4; 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

Multiple Choice: Electric current may be expressed in which one of the following units?

Q-1; Multiple Choice: For the hydrogen atom, which series describes electron transitions to the N=1 orbit, the lowest energy electron orbit? Is it the:
w) Lyman series
x) Balmer series
y) Paschen series
z) Pfund series
ANSWER: W -- LYMAN SERIES

Q-2; Multiple Choice: Electric current may be expressed in which one of the following units?
w) coulombs/volt
x) joules/coulomb
y) coulombs/second
z) ohms/second
ANSWER: Y -- COULOMBS/SECOND

Q-3; Short Answer: In the SI system of measure, what is the unit of capacitance?
ANSWER: FARAD

Q-4; Multiple Choice: A Newton is equal to which of the following?
w) kilogram-meter per second
x) meter per second squared
y) kilogram-meter per second squared
z) kilogram per meter-second
ANSWER: Y -- KILOGRAM-METER PER SECOND SQUARED

Q-5; Multiple Choice: For an object moving in uniform circular motion, the direction of the instantaneous acceleration vector is:
w) tangent to the path of motion
x) equal to zero
y) directed radially outward
z) directed radially inward
ANSWER: Z -- DIRECTED RADIALLY INWARD

show how the rate of flow of volume of liquid through a long tube

By means of dimensional analysis, show how the rate of flow of volume of liquid through a long tube depends on the pressure gradient, the viscosity of the liquid and the diameter of the tube. Any other dependences can be ignored.

Solution:
We want to find a, b and c in the following equation:

 And the final answer can be written out in full:

Perhaps the most difficult part of this question would be recalling the dimensions of viscosity. Knowing an alternative equation containing would help and I leave it to the reader to find one, then it might stick.

Physics Questance And Answer

Physics Quiz Questance
1. When light bends as it enters a different medium the process is known as what?
2. A magnifying glass is what type of lens?
3. Electric resistance is typically measured in what units?
4. A person who studies physics is known as a?
5. Metals expand when heated and do what when cooled?
6. What is the first name of the famous scientist who gave us Newton’s three laws of motion?
7. What state of the art computer technology is used to train pilots when wanting to copy the experience of flying an aircraft?
8. Electric power is typically measured in what units?
9. The most recognized model of how the universe begun is known as the?
10. Who is the Hubble Space Telescope named after?
11. The wire inside an electric bulb is known as the what?
12. Theoretical physicist James Maxwell was born in what country?
13. Infrared light has a wavelength that is too long or short to be visible for humans?
14. What kind of eclipse do we have when the moon is between the sun and the earth?
15. True or false? Iron is attracted by magnets.
16. What is the earth’s primary source of energy?
17. Conductors have a high or low resistance?
18. Electric current is typically measured in what units?
19. What scientist is well known for his theory of relativity?
20. Earth is located in which galaxy?


 Physics Quiz Answers
 1. Refraction
2. Convex
3. Ohms
4. Physicist
5. Contract
6. Isaac
7. A flight simulator
8. Watts
9. Big bang
10. Edwin Hubble
11. Filament
12. Scotland
13. Long
14. A solar eclipse
15. True
16. The sun
17. Low
18. Amperes
19. Albert Einstein
20. The Milky Way galaxy