17. a 25 kg block is initially at rest on a rough, horizontal surface. a horizontal force of 75 n is required to set
the block in motion, and a 60 n force is required to keep it in motion at a constant speed once it is moving.
what are the coefficients of static and kinetic friction?

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

The temperature at a point (x, y) is t(x, y), measured in degrees celsius. a bug crawls so that its position after t seconds is given by x = 6 + t , y = 8 + 1 3 t, where x and y are measured in centimeters. the temperature function satisfies tx(3, 9) = 5 and ty(3, 9) = 4. how fast is the temperature rising on the bug's path after 3 seconds? (round your answer to two decimal places.)