The skateboard and skateboarder has a combined
mass of 65kg. He accelerates
down the ramp at 2m/s2. What
is the force that the
skateboarder exerted? Show
your work.

Pls help Thanks

Which type of current is produced by a wire breaking magnetic field lines and changing the polarity? a. alternating b. direct c. straight d. alternating and direct

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Determine the change in width a, height b, thickness t when a plate is subjected to the uniform distributed load and is made of material having modulus of elasticity e=230 gpa and poisson's ratio ν=1/3. given : a=400 mm and b= 300 mm also the uniformly distributed load in downward y direction of plate is 2 mn/m and in the positive x direction is 3 mn/m and t=20 mm