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Definition
distance traveled/time taken
d/t |
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| average speed X time taken |
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| Velocity equal speed with a direction |
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Definition
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| change in position/time taken |
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| change in velocity/time taken |
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| the velocity of an object remains constant unless an unbalanced for |
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| What is the kinetic energy of an 86 kg sprinter running at 11 m/s? |
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| work=forceXdistance moved |
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Term
| gravitional potential energy |
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Definition
| GPE= (mass)(gravity)(height) |
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Definition
is the same as KE+GPE
witch is =1/2mv^2+mgh |
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Definition
| energy converted/time taken |
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| A 0.5 kg air-hockey puck is initially at rest. What will its kinetic energy be after a net force of 0.6 N acts on it for a distance of 0.4 m? |
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Definition
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A 15 N block lifted straight upward by a hand applying a force of 15 N has an initial kinetic energy of 8 J. If the block is lifted 2 m, how much work does the hand do?
What is the block's final kinetic energy? |
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Definition
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The Earth, which orbits the Sun in an elliptical path, reaches its closest point to the Sun on about January 4 each year. Will the work done by the gravitational force of the Sun on the Earth be positive, negative, or zero over the next 6 months?
Will the work done be positive, negative, or zero over the next year? |
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Definition
The work done will be negative
The work done will be zero |
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Term
| A woman with a mass of 65 kg climbs a set of stairs that are h = 2 m high. How much gravitational potential energy does she gain? |
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Definition
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A baseball (mass = 145 g) is thrown straight upward with kinetic energy 10.15 J.
(a) When the ball has risen 7 m, find the work done by gravity. (Take g = 10 m/s2)
(b) Find the ball's kinetic energy.
(c) Find the ball's speed. |
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| What is the gravitational potential energy of a ball with a weight of 58 N when it is sitting on a shelf 1.8 m above the floor? |
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| If a 0.6 kg ball is dropped from a height of 9 m, what is its kinetic energy when it hits the ground? |
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Definition
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Term
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Definition
a=w/t
ex. 200rpm-500rpm/60mins
ans= -5rpm/mins |
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Term
Rotational acceleration
(remember change the sign to the opposite) |
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Definition
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Definition
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Term
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Definition
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Term
| The angular velocity of an object remains constant unless acted on by an unbalanced torque |
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Definition
| Newtons 1st law of rotation |
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Term
| The net torque on an object is equal to its rotational inertia times it rotational acceleration |
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Definition
| Newtons 2nd law of rotation |
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Term
formula for rotational kinetic energy
is same as the one for kinetic energy |
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Definition
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Term
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Definition
| rotational inertia X rotational speed |
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| If the beaters on a Mixmaster make 890 revolutions in 3 minutes, what is the average rotational speed of the beaters? Express your answer in both revolutions per minute and revolutions per second. |
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| What is the rotational speed of the minute hand on a clock? |
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| If the rotational speed of a CD changes from 700 rpm to 275 rpm as it plays 30 minutes of music, what is the CD's average rotational acceleration? |
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Definition
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| You are holding a 30 kg dumbbell straight out at arm's length. Assuming your arm is 0.72 m long, what torque is the dumbbell exerting on your shoulder? |
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Definition
216 N·m
(just add a decimal point) |
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Term
| Two children with masses of 21 and 43 kg are sitting on a balanced seesaw. If the lighter child is sitting 3 m from the center, where is the heavier child sitting? |
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Definition
1.46 m from the center
(set up a ratio) |
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| What mass would you hang on the right side of the system in the figure to balance it -- that is, to make the clockwise and counterclockwise torques equal? (Let x1 = 36 cm and x2 = 20 cm.) |
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| A child with a mass of 55 kg is riding on a merry-go-round. If the child has a speed of 3 m/s and is located 1.3 m from the center of the merry-go-round, what is the child's angular momentum? |
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Definition
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| the laws of physics are the same in all inertail reference systems |
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Definition
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A spring gun fires a ball horizontally at 12 m/s. It is mounted on a flatcar moving in a straight line at 25 m/s.
(a) Relative to the ground, what is the horizontal speed of the ball when the gun is aimed forward?
(b) Relative to the ground, what is the horizontal speed of the ball when the gun is aimed backward? |
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Definition
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An aircraft carrier is moving to the north at a constant 21 mph on a windless day. A plane requires a speed relative to the air of 145 mph to take off.
(a) How fast must the plane be traveling relative to the deck of the aircraft carrier to take off if the plane is headed north?
(b) How fast must the plane be traveling relative to the deck if the plane is headed south? |
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Definition
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Find the value that an observer would measure for the magnitude and direction of the free-fall acceleration in an elevator near the surface of the Earth if the elevator is accelerating downward at each of the following rates.
(a) 5 m/s2 |
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Definition
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Term
| the laws of physics are the same in all intertial systems |
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Definition
| first postulate of special reativitly |
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Term
| The speed of light in a vacuum is costant regardless of the speed of the source or this speed of the obsever |
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Definition
| 2nd postulate of special relativity |
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Term
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Definition
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| relativistic adjustment factor |
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Definition
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Term
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Definition
| know speed of light X microseconds |
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| What is the size of the adjustment factor for a speed of 0.5 c? |
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P=F/A
=6000N/2m^2
=3000N/m^2 |
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Definition
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| Given that the carbon atom has a mass of 12 amu, how many carbon atoms are there in a diamond with a mass of 1 g? |
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Definition
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| About how many atoms would it take to deposit a single layer on a surface with an area of 3 cm2? (Assume the atom has a cross sectional area of A = 1 10-20 m2.) |
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| You exert a force of 20 N on the head of a thumbtack. The head of the thumbtack has a radius of 4 mm. What is the pressure on your thumb? |
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Definition
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| the buoyant force is equal to weight of the weight of the displaced fluid |
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An object has a mass of 290 kg and a volume of 0.4 m3.
What is its average density?
Will this object sink or float in water? |
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Definition
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| A solid ball with a volume of 0.1 m3 is made of a material with a density of 3180 kg/m3. What is the mass of the ball? |
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Definition
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Term
| What is the mass of a lead sinker with a volume of 9 cm3? |
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Definition
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Term
| if objects A and B are in thermal equilibrium with object C, then A and B are in thermal equilibrum with eachother |
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Definition
| zeroth law thermodynamics |
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Term
| the increase in the internal energy of a system is equal to the heat added plus the work done on the system |
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Definition
| 1st law of thermodynamics |
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Term
| Absolute zero may be approached experimentally but can never be reached |
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Definition
| 3rd law of thermodynamics |
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Definition
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ΔL=aLΔT
=(.000011/*C)(50m)(40*C)
=0.022m |
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Definition
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