1.) A light string pulls a 8.0kg object directly upward with an acceleration of
ID: 2138776 • Letter: 1
Question
1.) A light string pulls a 8.0kg object directly upward with an acceleration of 2.45m/s2. What is the tension in the string?
2.) A 2.0kg block, initially moving at 10.0m/s, slides 50.0m across a sheet of ice before coming to rest. What is the magnitude of the average frictional force on the block?
3.) A horizontal force of 50N is needed to keep a 25kg block moving with constant velocity of magnitude 5m/s across a horizontal rough table. What is the coefficient of kinetic friction?
4.) Two blocks, of masses m1= 10kg and m2= 5kg respectively, are connected by a massless unstretchable string and are pulled, by an applied force Fa, up a frictionless incline which makes an angle of ?= 30? with the horizontal. The tension in the string which connects the two blocks is T= 100N. Note that the m1= 10kg block is lower on the incline.
A.) What is the Component, parallel to the incline, of the net force on the block of mass m1 = 10kg
B.) What is the Acceleration of the block of mass m1 = 10kg
C.) What is the component, parallel to the incline, of the net force on the block of mass m2 = 5kg
D.) What is the magnitude of the applied force Fa??
Explanation / Answer
1) T-mg= ma
T = mg+ma = 8(9.8+2.45) = 98 N
2) a = v^2 - u^2/2s = 0 - 100/ 2*50 = -1 m/s^2
F = ma = 2*-1 = -2 N
3) F = umg
50 = u*25*9.8
u = 0.204
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.