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## A 1-kg of wood is pressed against a vertical wall (µs= 0.25) by a force inclined 40º upward with respect to the vertical axis.

A 1-kg of wood is pressed against a vertical wall (µs= 0.25) by a force inclined 40º upward with respect to the vertical axis. Determine the maximum force which can start the motion of the block.   F = (0.25)(9.8 cos40)+(9.8 sin30) / cos(4) – 0.25(sin30)= 7. 77 N

## The coefficient of friction between the sole of a shoe and a tile span roof is 0.36.

The coefficient of friction between the sole of a shoe and a tile span roof is 0.36. What minimum slope of the roof can start slipping?   Θ = tan Θ = tan 20° = 0.36

## A 60 kg package rests on the level floor of a warehouse.

1.) A 60 kg package rests on the level floor of a warehouse. If the coefficients of static and kinetic frictions are 0.56 and 0.37 respectively, what horizontal pushing force is required to (a) start the package’s motion? (b) slide ...

## A 1340 kg Triumph TR-8 traveling north at 43 km/hr crashes head-on into a 1850 kg Checker cab moving west at 87 km/hr.

A 1340 kg Triumph TR-8 traveling north at 43 km/hr crashes head-on into a 1850 kg Checker cab moving west at 87 km/hr. The two cars become tangled together. What is their speed a moment after the collision? If east is ...

## A charge of -7 x 10-8 C exerts a force of 0.045 N on a charge of +6.0 x 10-7.

A charge of -7 x 10-8 C exerts a force of 0.045 N on a charge of +6.0 x 10-7. How far apart far are the charges?   f=kQq/r2 Rearanged: [sqrt](kQq/r2) =[√](9×109)(7×10-8C)(6×10-7C)/(0.… r=.092m

## In reaching her destination, a backpacker walks with an average velocity of 1.27 m/s, due west.

In reaching her destination, a backpacker walks with an average velocity of 1.27 m/s, due west. This average velocity results, because she hikes for 5.89 km with an average velocity of 2.18 m/s due west, turns around, and hikes with ...

## The froghopper, Philaenus spumarius, holds the world record for insect jumps.

The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0 degrees above the horizontal, some of the tiny critters have reached a maximum height of 58.7 cm above the level ground. The ...

## A man is laying on a board elevated by a support at the tip of the head of the board and by a scale at the foot of the board.

A man is laying on a board elevated by a support at the tip of the head of the board and by a scale at the foot of the board.  What would happen if a support is placed exactly at ...

## A hunter aims directly at a target (on the same level) 140 m away. If the bullet leaves the gun at a speed of 280 m/s, by how much will the bullet miss the target?

A hunter aims directly at a target (on the same level) 140 m away. If the bullet leaves the gun at a speed of 280 m/s, by how much will the bullet miss the target?   In projectile motion constant horizontal velocity Vx is ...

## Replace the force system acting on the frame by a resultant force and couple moment at point A.

Replace the force system acting on the frame by a resultant force and couple moment at point A. Take F_1 = 8kN , F_2 = 4kN , F_3 = 3kN.