Jessica is visiting a park with her mother. jessica sits on a swing. her mother pulls the swing to a height of 3 meters above the ground and lets it go. the image shows jessica at three positions on the swing. jessica‘s mass is 44 kilograms and the maximum velocity of the swing is 5 meters/second. what’s the energy she has at each position shown? ignore friction and air resistance. use g = 9.8 m/s2, pe = m × g × h, and ke = 0 joules ke = 550 joules pe = 862.4 joules

Adelivery truck leaves a warehouse and travels 2.60 km north. the truck makes a left turn and travels 1.25 km west before making another right turn to travel 1.40 km north to arrive at its destination. what is the magnitude and direction of the truck's displacement from the warehouse?

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

The material that keeps its new shape after it is stretched is called?