1. which of the following statements expresses a physical science definition of energy? a. the ability to do work b. the ability to move from one place to another c. the readiness to be very active d. the rate at which work is done 2.in which of the following is work being done? (multiple answers) a. a traveler lifts a suitcase from the floor up to the baggage cart. b. an elevator carries people from the ground floor to the fifth floor. c. a woman tries hard to lift a barbell, but the barbell doesn’t move. d. a child drags her large teddy bear across the floor. e. a rocket ship rests on the moon.

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?

Which of the following is not a means to accelerating? question 4 options: a)increase speed b)remain still c)decrease speed d)change direction