Which has more kinetic energy: a 0.0010-kg bullet traveling at 389 m/s or a 5.8  107-kg ocean liner traveling at 15 m/s (29 knots)?Justify your answer.

calculate the train's final speed and energy lost with these numbers.  A train car hits a three-car train; together, it becomes a four-car train. The mass of each train car is 40*103 kg. The initial speed of the single car is 3.3 m/s. The initial speed of the three-car train is 1.8 m/s.

a) What is the kinetic energy of an automobilewith a mass of 1299 kg traveling at a speed of11 m/s?Answer in units of J. b) What speed would a fly with a mass of0.629 g need in order to have the same kineticenergy as the automobile?Answer in units of m/s.

A roller coaster has 800,000 Joules of kinetic energy and is moving with a speed of 40 m/s. VWhat is the mass of the roller coaster in kg? PLEASE USE COMMAS IN YOUR ANSWERS IF NEEDED! The formula for kinetic energy is: KE = 1/2 mv2 V = velocity = distance/time DON'T FORGET SIG FIGS! « Previous 90°F Partly

A man of mass 79.5 kg walks down the aisle of an airplane at a speed of 1.50 m/s in the forward direction while the plane moves at a speed of 325 m/s relative to the earth. (a) Find the man's kinetic energy relative to the plane.(b) Find the man's kinetic energy relative to the earth.

A rocket is attached to the back of a train engine which pushes the engine along a curvy track with an applied force of 1,000 Newtons. The engine has a mass of 500 kg. The total length of track is 800 meters. Starting from rest, what will be the train's speed at the end of the track? (You must use energy methods for credit on this problem not kinematics.)

Sam's job at the amusement park is to slow down and bring to a stop the boats in the log ride. If a boat and its riders have a mass of 1200 kg and the boat drifts in at 1.3 m/s how much work does Sam do to stop it? Express your answer in joules.

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A speed boat requires 56 kW to move at a constant speed of 17 m/s. What is the resistive force in Newtons of the water at this speed?

Point Height (y) (m) Speed (v) (m/s) Potential Energy (J) Kinetic Energy (J) Mechanical Energy (round off to the nearest thousands) A 8 m 0 m/s 3430 J 0 J 3000 J B 3 m 8.8 m/s 1470 J 1936 J 3000 J C 2 m 9.9 m/s 980 J 2450 J 3000 J   - Calculate the ratio of the mechanical energy at B and mechanical energy at A (EB/EA) and (EC/EB). What do these ratios tell you about the conservation of energy? - Is the mechanical energy conserved between A and B? Explain. - Is the mechanical energy conserved between B and C? Explain