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Physics final
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Gravity
Terms in this set (40)
Two other dimensions (other than mass) used to derive measurements
Length and time
Mm represents
Millimeter
8.83, 8.84, and 8.82 are
Precise
Sig figs in 10.5 x 8.8 x 3.14
2.9 x 10^2
Expression for acceleration
change in v^2/change in x
Order of magitude for age in months
10^2
If the change in position, x, is related to velocity, v (m/s), according to the relation x=Av, the constant, A, has which dimension?
S (seconds)
For the triangle shown, find the sine of theta
6/9
In a certain right triangle, the two sides that are perpendicular to each other are 5 m and 7 m long. What is the length of the third side of the triangle?
Radical 74
Expression for average acceleration
Change in velocity/change in time
Velocity and acceleration are negative
Objects speeds up
A car starting from rest, accelerates in a straight line path at a constant rate of 2 m/s^2. How far will the car travel in 10 seconds?
100 m
How far does the object move in the time interval from 0-2 seconds on the graph of velocity vs. time?
10 m
What is the acceleration of the object from t=5s to t=6s?
-5 m/s^2
A tennis ball is grown vertically upward from the surface of an atmospheric-free planet with an initial speed of 20m/s. One second later, the ball is moving upwards at 15 m/s. What is the acceleration due to gravity on the surface of this planet?
5 m/s^2
SI unit to measure a car
Meter
A brick is dropped from rest at a height of 4.9 m. How long does it take for the brick to reach the ground?
1s
To derive our first kinematic equation of uniform acceleration (magic equation) the ____ of a velocity v. time curve was analyzed
Slope of
In which segment(s) of the graph does the object have the highest speed?
DE
What was the instantaneous velocity of the object at t=4 seconds?
10 m/s
A jogger runs 4 blocks due east, 8 blocks due south, and another two blocks due east. Assume all blocks are of equal size. Find the magnitude of the jogger's net displacement
10 blocks
Which of the following is NOT an example of projectile motion?
A thrown frisbee
A projectile is best described as an object
Only affected by gravity
If the direction is thrown vertically upward, the direction and magnitude of its acceleration while it is in the air is
Downward and constant
If the object is thrown horizontally, the direction and magnitude of its acceleration while it is in the air is
Downward and constant
Which statement is true concerning the ball at point C (at the highest point in its trajectory)
Neither the velocity or the acceleration are zero
How do the components of the velocity vector of the ball compare at points B and C?
The components are the same, the y component at C is zero
What are the respective horizontal and vertical components of the initial velocity of the football?
19.3 m/s, 23 m/s
How long is the football in the air? Neglect air resistance.
4.7s
How far does the football travel horizontally before it hits the ground?
90.4 m
A car goes forward along a level road at constant velocity. The force needed to bring the car into equilibrium is
Zero
When analyzing the motion of an object sliding down a hill with an incline of 20 degrees the best coordinate system points the x direction
Down the incline
Newton's second law describes
The relationship between force mass and acceleration
Which of the following does NOT necessarily describe an object in equilibrium
Constant speed
A person weighs 800 N on earth, how much mass does he have on the moon?
81.6 kg
A component of a vector is
Found trigonometrically
A sled weighing 200 N is held in place on a frictionless 20 degree slope by a rope attached to a stake at the top. The rope is parallel to the slope. What is the normal force of the slope acting on the sled
68.4 N
A couch of mass 300 kg is laced on a movers ramp that makes a 25 degree angle with the horizontal. If the couch starts sliding down the ramp with an acceleration .7 m/s^2, what is the coefficient of kinetic friction between the ramp and the couch?
.39
A 4500 kg helicopter accelerates upward at 2 m/s^2. What lift force is exerted by the air on the propellers?
5.31 X 10^4 N
A force of 40 N accelerates a 5 kg block at 6 m/s^2 along a horizontal surface. How large is the frictional force?
10 N
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