No sistema representado abaixo, a massa do bloco a é igual a 2 kg, a do bloco b é igual a 8 kg. a aceleração da gravidade vale 10 m/s² e o coeficiente de atrito cinético entre o bloco e a superfície de apoio vale 0,2. nessas condições a aceleração dos blocos e a força de tração no fio são respectivamente iguais a: a. 19,2 m/s² e 4 n b. 0,4 m/s² e 19,2 n c. 5 m/s² e 10 n d. 4 m/s² e 19,2 n e. 0,4 m/s² e 20 n

What is the coefficient of kinetic friction μk between the block and the tabletop?

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.

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