Physics 130 Sample Exam 4 Short Answer section. Please answer all of the short answer questions. 1. Compute the total angular momentum and kinetic energy that the earth has due to its rotation about an axis that runs from the north to the south pole. Comp
Sample Exam 3 1. A spring stores 50 J when it is compressed by 10 cm. What is the spring constant k? 12 kx 2 2U 2 50 J k= 2 = = 10, 000 N / m x (0.1m)2 U= 2. A conservative force has the form F = b x3 i. What potential energy is associated with this force
Sample Exam 2 Short answer. 1. You whirl a rock on a string in a vertical circle. What is the minimum speed that the rock needs to have at the top so that the string does not become limp? Note: You do not need the mass of the rock.
mv 2 = T + mg r T =0 mv
Sample Exam 1 - Physics 130 Short Answer Section 1. Estimate the volume of gold in a solid gold wedding ring. The density of gold is 19.3 10 3 kg / m3 . rinner = 1cm = 1 102 m router = 1.2cm = 1.2 102 m h = 0.4 cm = 4.0 103 m volume = (router2 rinner 2 )
Physics 130 Exam 4 Short Answer section. Please answer all of the short answer questions. 1. A disk rotates with an angular velocity of 10 rad/s. If the disk has a mass of 50 kg and has a radius of 1.5m, what angular momentum and kinetic energy does this
Exam 3 Physics 130 Short Answer Section. Please answer all of the questions. 1. A 200,000 kg locomotive has a linear momentum of 1, 000, 000 kg locomotives velocity vector and what kinetic energy does it have?
m i . What is the s
p = mv p v = = 5m / s i
Exam 2 Physics 130 Short Answer Section. Please answer all of the questions. 1. A 2000 kg automobile moves around an unbanked curve of radius 50 m at 30 m/s. What centripetal force is present due to friction.
mv 2 2000 kg ( 30 m / s )2 Fc = = = 36, 000 N
Physics 130 Exam 1 Short Answer. Please answer all of the short answer questions. 1. A new group is trying to shatter the land speed record. Their goal is to go 1000 mi/hr. How fast is this in m/s?
v=
1000 mi 1600 km 1 hr = 444.4 m / s hr 1 mi 3600 s
2. Y
Chapter 13 13.1 What must the separation be between a 5.2kg particle and a 2.4 kg particle for their 12 gravitation attraction have a magnitude of 2.3 10 N ? Newtons Law of Universal Gravitation states F =G Mm r2 Mm 5.2 kg 2.4 kg r= G = 6.67 1011 F 2.3 10
Chapter 12 12.5 In the gure, a uniform sphere of mass m = 0.85 kg and radius r = 4.2 cm is held in place by a massless rope attached to a frictionless wall of distance L = 8.0 cm above the center of the sphere. Find (a) the Tension in the cord and (b) the
Chapter 11 11.8 In the Figure, a solid brass ball of mass 0.280 g will roll smoothly along a loop-the-loop track when released from rest along the straight section. The circular loop has radius R = 14.0 cm and the ball has radius r R . (a) What is h if th
Chapter 10 10.9 A disk, initially rotating at 120 rad/s is slowed down with a constant angular acceleration of 2 magnitude of 4.0 rad / s (a) How much time does the disk take to stop? (b) Through what angle does the disk rotate during that time?
f = i +
Chapter 9 9.2 Figure 9-37 shows a three particle system with masses m1 = 3.0 kg , m2 = 4.0 kg , and
m3 = 8.0 kg . The scales are set by xs = 2.0 m and ys = 2.0 m . What are (a) the x coordinate and
(b) the y coordinate of the systems center of mass? (c) I
Chapter 8 8.2 Figure 8-31 shows a ball with mass m = 0.341kg attached to the end of a thin rod with length L = 0.452 m and negligible mass. The other end of the rod is pivoted so that the ball can move in a vertical circle The rod is held horizontally as
Problems from Chapter 6 6.3 A person pushes horizontally with a force of 220 N on a 55 kg crate to move it across a level oor. The coefcient of kinetic friction is 0.35. What is the magnitude of (a) the frictional force and (b) the crates acceleration. N
Chapter 5 Problems 5.3 Only two horizontal forces act on a 3.0 kg body. One force is 9.0 N, acting due east , and the other is 8.0N act 62 degrees North of west. What is the magnitude of the bodys acceleration? F1 = 9 i + 0 j F2 = 8 cos 62 i + 8 sin 62 j
Chapter 4 4.1 A positron undergoes a displacement of r = 2.0 3.0 + 6.0 k , ending with \the position i j t vector r f = 3.0 t - 4.0 k in meters. What was the positrons initial position vector? j
D r = r f - ri ri = r f - D r t t = - 2.0 i + 6.0 t - 10.0 k
Chapter 2 Problems 2.58 A rock is thrown vertically uward from ground level at time t=0. At t=1.5s, it passes the to of a tall tower and 1.0 s later, it reaches its maximum height. What is the height of the tower y2.5 t=2.5s
y1.5=h
t=1.5s
t=0 s We begin b
Chapter 2 Problems 2.3 During a hard sneeze, your eyes might shut for 0.5s. If you are driving a car at 90km/h during such a sneeze, how far does the car move during that time
90 km 1000 m 1h = 25 m / s h 1km 3600 s d = s t = 25 m / s 0.5 s = 12.5 m / s s
Chapter 1 Problems 1.1 The micrometer is often called the micron. (a) How man microns make up 1 km? (b) What fraction of a centimeter equals 1 m ? (c) How many microns are in 1.0 yard We begin by calculating 1 km in microns d = 1.0km 1000m 1micron = 1 10