Once the lorry has reached its destination, the back of the lorry is tilted at an angle 8 to the horizontal.

Three forces act on the box: the weight W, the normal contact force R and the
frictional force F

(i) State expressions for the components of the weight of the box parallel to the back
of the lorry and perpendicular to the back of the lorry.
(2)

W
parallel
W
perpendicular

(ii) The angle is increased until the box is just about to slide.
Given that F= 0.32R, calculate the value of at which the box is just about to slide.

W=200g

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers

Energy flows from the producer level to the level. is called

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s