Hello guys please your support on the equation ‏F= P*A = 1013.25 * 25 =0.254*10^5 N/M2 ‏CONVERT gm/cm3 to kg/m3 : ‏1 gm/cm3

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A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2.