What is the mass of a shopping cart that is pushed with a net force of 10 n to accelerate at the rate of 0.5 m/s2?

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Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

You can decrease the resistance of a length of wire by