ExamKrackers: Physics Flashcards
Trig Values for 0 degrees
sin=0 cos=1
2 common triangles
3-4-5 5-12-13
acceleration = is this scalar or vector
change in velocity/ time vector
Trig Values for 30 degrees
sin=1/2 cos=root3/2 (approximately 0.87)
Trig Values for 45 degrees
sin=root2/2 cos=root2/2
Trig Values for 60 degrees
sin=root3/2 cos=1/2
Trig Values for 90 degrees
sin=1 cos=0
Trig Values for 180 degrees
sin=0 cos=-1
An airliner flies from Chicago to New York. Due to the shape of the earth, the airlines must follow a curved trajectory. How does the curved trajectory of the airliner affect its final displacement for this trip?
The displacement is the same as it would be if the airliner flew in a straight line to New York remember: displacement is the net distance. If this was a round trip flight, the displacement would be zero.
An automobile that was moving forward on a highway pulled over onto the exit rap and slowed to a stop. While the automobile was slowing down, what is true about the relationship between the velocity and acceleration?
The velocity was positive and the acceleration was negative
The earth moves around the sun at approximately 30 m/s. Is the earth accelerating?
Yes because the speed is not constant. remember: any change in velocity, whether magnitude or direction, is considered acceleration.
Speed= is this scalar or vector?
distance/time scalar *speed=instantaneous velocity (speedometer)
Velocity= is this scalar or vector?
displacement/time vector velocity=average velocity and is independent of the path taken
Multiplying vectors and the final quantity is scalar, what is the equation used?
Sproduct=V1V2cosX
Multiplying vectors and the final quantity is a vector, what is the equation used?
Vproduct=V1V2sinX
