Using a diffraction grating with a spacing of 0.00040 cm, a line appears 28.5 cm from the central line on the screen. The screen is 2.00 m from the grating. What is the wavelength of the light?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.