1. A bullet is moving towards a block as shown in the picture. The bullet after the collision sticks into the mass of 2 kg: (25 points)What should be the minimum speed of the bullet so the bullet and mass are lifted the height shown in the picture? Hint: Use trigonometry to find ”h” and use the conservation of momentum and energy!

What is hidden during a lunar eclipse? isn't the moon hidden?

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?

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.