Which of the following is a device that uses an inclined plane? Check all that apply.
A. knife
B. wheelchair ramp
C. bicycle
D. half-pipe at a skate park

Aman tries to push a box of mass 4 kg with a force of 5 n but the box remains stationary if the coefficient of static friction is 0.45, what is the value of the maximum force of friction?

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.