A 20 N force is pushing two blocks horizontally along a frictionless floor as shown below. What is the acceleration of the 8 kg block? F = 20 N
8 kg
> 2 kg
A. 2 m/s
B. 2.5 m/s2
C. 0.4 m/s2
D. 0.5 m/s2

What is the relationship between the wavelength of a wave and it's energy?

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

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.