A Toller-coaster vehicle has a mass of 490 kg when fully loaded with passengers (see figure). 15 m 10 m (a) If the vehicle has a speed of 21.0 m/s at point A, what is the force of the track on the vehicle at this point? (b) What is the maximum speed the vehicle can have at point B in order for gravity to hold it on the track? m/s

A commercial airplane is coming in for a landing. Just before it hits the runway it is moving at 76 m/s. The plane has a mass of 20,000 kg. The runway is 1.6km long and, obviously, the airplane needs to be stopped before it reaches the end of the runway. How large is the braking force the airplane needs to stop safely before the end of the runway?

A pendulum is pulled back at an angle of 20 degrees and released from rest. As the mass at the end of the pendulum swings back to its equilibrium position, which of the following variables decreases? (Select two right answers) Group of answer choices Tension in the string Velocity Acceleration Net Force

We start with some review problems A crate of mass 42.0 kg rests on a level surface, with a coefficient of kinetic friction 0.257. You push on the crate with an applied force of 375 N. What is the magnitude of the crate s acceleration as it slides?     14.29 m/s^2     6.41 m/s^2     8.93 m/s^2     2.56 m/s^2

A crate with mass m = 20 kg is being pushed to the right by a force of magnitude F = 80 N The crate is placed on a rough horizontal coefficient of kinetic friction surface with a HK= 0.2 Take g = 10 m/s² The acceleration of the crate is: 3.8 m/s^2 O 2 m/s^2 O 6 m/s^2 4 m/s^2

Mr. Vollmayer pulls his children (21kg and 24kg) on a sled (5kg). The force of the friction on the sled is 60N and he pulls upward at a 25 degree angle relative the the ground. How hard must he pull to move the sled at a constant velocity? what is the normal force acting on the sled?