g The sun's rays are focused, using a lens as a "burning glass." All the visible sunlight entering a lens of radius 2.70 cm is concentrated in a circular spot of radius 0.950 mm. Find the intensity of visible light in the spot if the intensity of visible light striking the lens is 777 W/m2.

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

Carbon 14 is a naturally occurring stable

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?