Physics 1401 Test 2 Review: Chapters 5-8 Find the acceleration of a particle mov
ID: 1874490 • Letter: P
Question
Physics 1401 Test 2 Review: Chapters 5-8 Find the acceleration of a particle moving with a constant speed of 8 m/s in a circle 2.0m in radius 1) 2) A force of 10.0N acts on a body of mass 2.0 kg. a) What is the body's acceleration? b) What is the weight of the body in newtons? c) What is the acceleration of the body if the force is doubled? 3) A boat moves through the water with two forces acting upon it. One is a 2000-N forward push by the motor. The other is an 1800-N resistive force due to the water a) What is the acceleration of the 1000kg boat? b) If it starts from rest, how far will the boat travel in 10.0s? c What will be the speed of the boat at the end of this time? 4) The distance between two telephone poles is 50.0m. When a 1.0kg bird lands on the telephone wire midway between the two poles, the wire sags 0.2m. How much tension does the bird produce in the wire? Ignore the weight of the wire. 5) A 25kg block is initially at rest on a horizontal surface. A horizontal force of 75N is required to get the block in motion. After it is in motion, a horizontal force of 60N is required to keep it moving with a constant speed. From this information find the coefficients of static and kinetic friction 6) A block is placed on a plane that is inclined at 60 with respect to the horizontal. If the block slides down the plane with an acceleration of g/2, determine the coefficient of kinetic friction between the block and the plane.Explanation / Answer
1. a_c = v^2 / R
a = 8^2 / 2 = 32 m/s^2
2. (A) a = F/ m = 10 / 2 = 5 m/s^2
(B) W = m g = 2 x 10 = 20 N
(C) a = 20/2 = 10 m/s^2
3) (A) Fnet = 2000 - 1800 = 200 N
a = F net / m = 200 / 100 = 2 m/s^2
(B) d = v0 t + a t^2 / 2
d = 0 + (2 x 10^2 / 2) = 100 m
(C) v = v0 + a t
v = 0 + (10 2) = 20 m/s