A race car moves such that its position fits the relationship
x(t) = (4.7 m/s)t + (0.77 m/s^3) t^3
where x is measured in meters and t in seconds.
Approximate the instantaneous velocity at
2 s, using a centered time interval of 0.1 s.
Answer in units of m/s

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)