Exam 4 Flashcards
(27 cards)
Two children are riding a merry go round child A is at a greater distance from the axis of rotation than child B which child has the larger ANGULAR SPEED
They have the same NON-zero angular speed
Not tangential
A race car traveling at a constant speed of 50 m/s drives around a circular track of radius 250 meter what is the angular acceleration
Zero
Because it is at constant speed there is no alpha
A planet is discovered to orbit around a star in the galaxy andromeda with the same orbital diameter as the earth around our sun. If the star has 4 times more mass than the sun what will the period of the revolution of the new planet be compared to earth
One half as much
For a spherical planet to act like a point mass so that the externally F=GmM/r^2 it
Must have spherical mass symmetry
The speed of Haileys comet while traveling in its elliptical orbit around the sun
Increases as it nears the sun
Two children are riding on a merry go round, child A is at a greater distance from the axis of rotation than child B. Which child has the largest TANGENTIAL SPEED
Child A
Satélite A has twice the mass of satélite T, and rotates in the same orbit. Which of the following is true
The speed of T is equal to the speed of A
Its not dependant on mass
The following statements refer to man-made artificial satellites in orbit around the earth. Which is an accurate statement
A satélite in a large diameter circular orbit will always have a longer period of revolution about the Earth than will a satellite in a smaller circular orbit
An astronaut goes out for a space walk at a distance above the earth equal to the radius of the earth. Her acceleration will be
1/4g
A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is just to maintain contact with the track at the top of the lop what is the minimum value for its speed at that point
Sq root of rg
If a constant net torque is applied to an object that object will
Rotate with constant angular acceleration
We can best understand how a driver is able to control his rate of rotation while in the air and this enter the water in a vertical position by observing that while in the air
His angular momentum is constant
The condition for rolling without slipping is that the center of mass speed is
Vcm=rw
A heavy boy and a lightweight girl are balanced on a massless seesaw. If they both move forward so that they are one half their original distance from the pivot point what will happen to the seesaw
Nothing, the seesaw will still be balanced
A pencil is balanced on its tip such that it does not move
Is in unstable equilibrium
Two equal forces are applied to a door at the doorknob. The first force is applied perpendicular to the door the second force is applied at 30 degrees to the plane of the door. Which force exerts the most force
The first applied perpendicular to the door
A planet speed up in its orbit as it gets closer to the sun because
Conservation of angular momentum
What conditions are necessary for static equilibrium
Fx=Fy=sum of torque=0
When soup gets cold it often taste greasy. The greasy taste seems to be associated with oil spreading throughout the surface of teh soup instead of little globs. This is explained in terms of
The increase in the surface tension of water with increasing temp
The pressure differential across a wing cross section due to the difference in the air flow is explained by
Bernoulli’s equation
When you are scuba diving the pressure on your face plate
Depends only on your depth and not on how much you are oriented
Air is forced to flow over an object whos cross section is shown. The speed of the air flowing close to the top surface is…….. the speed of teh air flowing close to the bottom surface
Less than
A submarine rest on the sea bottom. The normal force exerted upon the sub by the sea floor is equal to
The weight of the sub less the weight of the displaced water
Which one of the following would be expected to have the smallest BULK MODULES
Helium vapor
