A student bends a paper clip back and forth rapidly. After repeating this action several times, the student touches the bent part of the paper clip and observes that the metal has become warm. Which statement best explains the student's observation? Because mass is lost from the paper clip, heat energy is increased in the paper clip. Because volume is lost from the paper clip, heat energy is increased in the paper clip. Because energy is conserved, some energy of motion is converted into heat in the paper clip. Because energy is conserved, some of the motion is converted into electricity in the paper clip.​

You notice a very one-dimensional-thinking snail crawling along one rail of a railroad track. naturally, you remove it to a safer place. but before you do, you observe it as it moves from position xi = -92.9 cm to position xf = -64.9 cm along the rail, as measured from a point where one rail abuts the next. what is the snail\'s displacement δx in centimeters?

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.