Ablock with mass m 2.00 kg is placed against a spring on a frictionless incline with angle 30 degrees (fig. b-43). (the block is not attached to the spring.) the spring, with spring constant k 19.6 n/cm, is compressed 20 cm and then released. (a) what is the elastic potential energy of the compressed spring? (b) what is the change in the gravitational potential energy of the block - earth system as the block moves from the release point to its highest point on the incline? (c) how far along the incline is the highest point from the release point?

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?

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)

Aplane's average speed between two cities is 600 km/h. if the trip takes 2.5 hours, how far does the plane fly?