Amother pulls her two children on a sled through the snow along a flat street. how much work is done if she pulls her children 100 feet with a constant force of 40 pounds at an angle of 28°?

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.