A car in a roller coaster moves along a track that consists of a sequence of ups and downs. Let the
x axis be parallel to the ground and +y axis point upward. In the time interval from t=0 to t=4 s the trajectory of the caralong a certain section of the track is given by
→r=A(1 m/s)t^i+A((1 m/s3)t3−6(1 m/s2)t2)^j, where A is positive dimensionless constant. a. At t=2.0s is the roller coaster car ascending or descending?
b. Derive a general expression for the speed v of the car. Make sure that your expression would give the correct value for the speed (in m/s), but you don't need to put in anything explicitly about units (unlike what you see in the original expressionfor →r. Express your answer in meters per second in terms of A and t.
Answers: 2
Physics, 22.06.2019 04:00
All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction
Answers: 2
Physics, 22.06.2019 17:30
Current from a charged capacitor lights a bulb. as time goes on the brightness of the
Answers: 3
Physics, 22.06.2019 20:00
Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?
Answers: 3
A car in a roller coaster moves along a track that consists of a sequence of ups and downs. Let the...
Mathematics, 28.04.2021 21:00
Mathematics, 28.04.2021 21:00
Mathematics, 28.04.2021 21:00
Mathematics, 28.04.2021 21:00
Biology, 28.04.2021 21:00
English, 28.04.2021 21:00
Mathematics, 28.04.2021 21:00
Mathematics, 28.04.2021 21:00
Mathematics, 28.04.2021 21:00
SAT, 28.04.2021 21:00
Mathematics, 28.04.2021 21:00
Chemistry, 28.04.2021 21:00