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Flashcards in ODU Deck (39)
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1
Q

What is an acceleration time graph like for a velocity time graph that is a straight horizontal line➡️?

A

Nothing/no line.

2
Q

What is an displacement time graph like for a velocity time graph that is a straight horizontal line➡️?

A

A straight constant line and slopping upwards from left to right.↗️

3
Q

What is an acceleration time graph like for a velocity time graph that is a straight constant line sloping upwards from left to right↗️?

A

A straight horizontal line above the x axis.➡️

4
Q

What is an displacement time graph like for a velocity time graph that is a straight constant line sloping upwards from left to right↗️?

A

A mountain curving inwards sloping upwards from left to right.⤴️

5
Q

What is an acceleration time graph like for a velocity time graph that is a straight constant line sloping downwards from left to right↙️?

A

A straight horizontalline below the x axis.➡️

6
Q

What is an displacement time graph like for a velocity time graph that is a straight constant line sloping downwards from left to right↙️?

A

Half an igloo curving outwards and sloping upwards from left to right

7
Q

What does the gradient of a displacement - time graph give?

A

The velocity of the object.

8
Q

What does the gradient of a velocity time graph give?

A

The acceleration of the object.

9
Q

What does the area under the velocity time graph give?

A

The displacement.

10
Q

What is Newton’s 1st law?

A

An object will remain at rest or continue to move in a straight line at a constant speed unless acted upon by an unbalanced force.

11
Q

What is Newton’s second law?

A

The force acting on an object is the sum of the acceleration times the mass of the object.

12
Q

What is Newtown’s third law?

A

For every action there is an equal and opposite reaction.

13
Q

What is terminal velocity?

A

When the two forces (air resistance and weight) acting on normally a sky diver are equal and the velocity is constant and at the maximum velocity which could possibly be reached.

14
Q

What is the statement for the conservation of energy?

A

Energy cannot be destroyed or created, it can only be changed from one form into another.

15
Q

What is the statement for the conservation of momentum?

A

The total momentum before a collision is equal to the total momentum after a collision.

16
Q

What is an elastic collision?

A

Where the TOTAL kinetic energy before is equal to the TOTAL kinetic energy after the collision.

17
Q

What is an inelastic collision?

A

Where the TOTAL kinetic energy after is less than the Total kinetic energy before the collision.

18
Q

What is the impulse of a force equal to?

A

The area under a force-time graph and is equal to the change in momentum of an object involved in the interaction.

19
Q

What are the horizontal motion and the vertical motion of a projectile of each other?

A

Independent of each other.

20
Q

What is a projectile?

A

An object which is influenced only by the downward force of gravity.

21
Q

For the horizontal motion of a projectile do you use cos or sin?

A

Cos

22
Q

For the vertical motion of a projectile do you use cos or sin?

A

Sin

23
Q

What are satellites in around a star/planet?

A

Free fall

24
Q

What is the speed of light in a vacuum for all observers?

A

The same.

25
Q

What does the Doppler effect cause?

A

Shifts in wavelength of light and sound.

26
Q

For the Doppler effect equation is an object moving towards + or -?

A

-

27
Q

For the Doppler effect equation is an object moving away + or -?

A

+

28
Q

If light is redshifted is it moving towards or away from an observer?

A

Away

29
Q

If light is blue-shifted is it moving towards or away from an observer?

A

Towards

30
Q

In the equation z=v/c what does v stand for?

A

The recessional velocity of the galaxy.

31
Q

What does bubbles law allow us to calculate?

A

The age of the universe.

32
Q

What does the measurements of the velocities of galaxies and their distance from us lead to?

A

The theory of the expanding universe.

33
Q

How can the mass of galaxies be estimated?

A

By the orbital speed of stars within it.

34
Q

Where does the evidence supporting the existence of dark matter come from?

A

Estimation of the mass of galaxies.

35
Q

Where does the evidence supporting the existence of dark energy come from?

A

The accelerating rate of the expansion of the universe.

36
Q

What is the temperature of stellar objects related to?

A

The distribution of emmited radiation over a wide range of wavelengths.

37
Q

What is the peak wavelength for hotter objects than for cooler objects?

A

Smaller

38
Q

What do hotter objects emit more of than cooler objects?

A

More radiation per unit surface area per unit time.

39
Q

What is evidence supporting the Big Bang theory and subsequent expansion of the Universe?

A

Cosmic microwave background radiation, the abundance of the elements hydrogen and helium, the darkness of the sky (Olbers’ paradox) and the large number of galaxies showing redshift rather than blueshift.