Question
Q1
Q2
and this
An aluminum block of mass m1 = 4.70 kg and a copper block of mass m2 = 7.40 kg are connected by a light string over a frictionless pulley. They sit on a steel surface as shown in the figure below, where theta = 38.0 degree .(See the table below for the appropriate coefficients of friction). When they are released from rest, will they start to move? Yes No If the blocks move, determine the magnitude of their acceleration. (If the blocks do not move, enter 0.) m/s2 If the blocks move, determine the magnitude of the tension in the string. (If the blocks do not move, enter 0.) N If the blocks do not move, determine the sum of the magnitudes of the forces of friction acting on the blocks. (If the blocks move, enter 0.) N Coefficients of Friction Rubber on concrete 1.0 0.8 A 2.20-kg block starts from rest at the top of a 30.0.degree incline and slides a distance of 1.70 m down the incline in 1.60 s. Find the magnitude of the acceleration of the block. m/s2 Find the coefficient of kinetic friction between block and plane. Find the friction force acting on the block. magnitude N direction Find the speed of the block after it has slid 1.70 m. m/s A block of mass m = 2.00 kg is released from rest at h = 0.800 m from the surface of a table, at the top of a theta = 50.0 degree incline as shown below. The frictionless incline is fixed on a table of height H = 2.00 m. Determine the acceleration of the block as it slides down the incline. m/s2 What is the velocity of the block as it leaves the incline? m/s How far from the table will the block hit the floor? m How much time has elapsed between when the block is released and when it hits the floor? s Does the mass of the block affect any of the above calculations? Yes No
Explanation / Answer
1) Coefficient of friction not visible
2)
a)1.32815
b) 0.3645
c) 7.858 N
up the incline
d)2.125 m/s
3)
a) 7.507 m/s^2
b)3.96 m/s
c)1.018
d)0.9275 s
e) no
