Show Attempt History Current Attempt in Progress × Incorrect. A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 91.9 kg. The mass of the rock is 0.279 kg. Initially the wagon is rolling forward at a speed of 0.547 m/s. Then the person throws the rock with a speed of 16.3 m/s. Both speeds are relative to the ground. Find the speed of the wagon after the rock is thrown (a) directly forward in one case and (b) directly backward in another. (a) vi 0.402 (b) v = i 0.505 m/s. m/s

A 686 N park ranger uses a basket and a rope-pulley system to transport an injured sea turtle up to a plateau, as shown in the figure. The sea turtle and basket together have a mass of 50.0 kg. The ranger holds firmly onto the rope and walks away from the cliff, speeding up at a steady rate of 0.300 m/2 2. He thereby causes the basket (and the turtle) to accelerate straight upwards at the same rate. Assume that the rope has negligible weight and that the pulley is ideal, having no friction in its bearing. Also assume that as the ranger trudges along, his feet do not slip on the ground. +x 26. The tension in the rope is equal to A. 490 N. B. 686 N. C. 475 N. D. 505 N. E. 196 N. 27. The frictional force which the ground exerts on the ranger's feet has a magnitude of C. 526 N. A. 490 N. B. 511 N. D. 196 N. E. 707 N.

11. A 450 g model rocket is on a cart that is rolling to the right at a speed of 4 m/s. The rocket engine, when it is fired, exerts a 6 N vertical thrust on the rocket. Your goal is to have the rocket pass through a small horizontal loop that is 22 m above the ground. At what horizontal distance left of the loop should you launch?

A stationary 2.17-kg object is struck by a stick. The object experiences a horizontal force given by F = at - bt 2, where t is the time in seconds from the instant the stick first contacts the object. If a = 1,500,000 N/s and b = 20,000,000 N/s?, what is the speed of the object just after it comes away from the stick at t = 2.55 x 103 s? %3D

Identical twins, each with mass 62.0 kg, are on ice skates and at rest on a frozen lake, which may be taken as frictionless. Twin A is carrying a backpack of mass 12.0 kg. She throws it horizontally at 2.80 m/s to Twin B. Neglecting any gravity effects, what are the subsequent speeds of Twin A and Twin B? Twin A     m/s Twin B     m/s

23.  Two blocks are attached to a light string. Block A (mA=7.9kg) is at rest on a frictionless table. Block B (mB=1.36kg) hangs off the edge of the table, as shown. Both blocks are released from rest.Using the single-system approach, what is the acceleration of the system?a=          ms2   Block A is on a table and block B is hanging off the table on a rope connecting the two blocks*Round your answer to the nearest thousandth if necessary.

The figure shows a graph of E102 Part 1. The mass of the object is 0.696 kg. Which of the following is correct? Force (N) 1.0 0.80 0.60 0.40 0.20 0.0 0.0 1.0 است 2.0 3.0 4.0 Time (s) 5.0 6.0 7.0 8.0 The kinetic friction is 0.80 N and the starting friction is 0.52 N. The coefficient of static friction is 0.076. The coefficient of kinetic friction is 0.117. The kinetic friction is 0.52 N and the starting friction is 0.80 N.