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Physics 1 Final
Terms in this set (30)
Can an object have a northward velocity and a southward acceleration? Explain.
Describe in words the motion plotted in Fig. 2-36 in terms 19. Describe in words the motion of the object graphed in Fig. 2-37. of v, a, etc.
If V = V2 + V2, is V necessarily greater than V1 and/or
V2 ? Discuss.
Two cannonballs, A and B, are fired from the ground with
identical initial speeds, but with 0A larger than 0B. (a) Which cannonball reaches a higher elevation? (b) Which stays longer in the air? (c) Which travels farther?
If an object is moving, is it possible for the net force acting on it to be zero?
You pull a box with a constant force across a frictionless
table using an attached rope held horizontally. If you now pull the rope with the same force at an angle to the horizontal (with the box remaining flat on the table), does the acceleration of the box (a) remain the same, (b) increase, or (c) decrease? Explain.
Can a centripetal force ever do work on an object? Explain.
Can a dot product ever be negative? If yes, under what
If the net force on a system is zero, is the net torque also
zero? If the net torque on a system is zero, is the net force zero?
Why do tightrope walkers (Fig. 10-43) carry a long, narrow beam?
When blood pressure is measured, why must the cuff be
held at the level of the heart?
For a simple harmonic oscillator, when (if ever) are the
displacement and velocity vectors in the same direction?
When are the displacement and acceleration vectors in the same direction?
Two equal masses are attached to separate identical springs next to one another. One mass is pulled so its spring stretches 20 cm and the other is pulled so its spring stretches only 10 cm. The masses are released simultaneously. Which mass reaches the equilibrium point first?
What happens to the period of a playground swing if you
rise up from sitting to a standing position?
A flat uniform cylinder of lead floats in mercury at 0°C. Will the lead float higher or lower if the temperature is raised?
Explain why burns caused by steam at 100°∆C on the skin are often more severe than burns caused by water at 100°C.
What is temperature
relates to the internal/microscopic kinetic energy of particles
What is the zeroth law of thermodynamics?
two systems in thermal equilibrium with a third system are in thermal equilibrium with each other
What is thermal expansion?
1D/linear expansion due to temp change
strip made of 2 metals that expand at different rates; this causes the strip to bend when heated
What is heat?
energy transfer between two substances in thermal contact
first law of thermodynamics
The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
What do the different signs of q mean
+ is energy in
- is energy out
What do the different signs of work mean
+work by- volume increasing
-work by- volume decreasing
4 different thermal processes and differences
isothermal- constant temperature
isobaric- constant pressure
isovolumetric- constant volume
no work done on or by gas, deltaEinternal=Q
adiabatic- no heat exchanged, often v rapid
A gas is taken from an initial lower volume and higher pressure to a lower pressure and higher volume. What can you say about the work on this gas during this process?
What is an example of when a process would be isothermal?
if it's in contact with a heat reserviour or a very slow quasistatic process
What is an example of when a process would be adiabatic?
very rapid w no heat exchanged
is molar specific heat for gases w constant volume or pressure higher?
higher for constant pressure
second law of thermodynamics
heat energy flows from higher to lower temperatures and entropy (disorder) increases
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