PHY101 Quiz #2, 2012 - UNCW Faculty and Staff Web Pages

PHY101 Quiz #2, 2012 1. A solar-powered car is traveling at constant speed around a circular track. What happens to the centripetal acceleration of the car if the speed is doubled? A) The centripetal acceleration remains the same. B) The centripetal acceleration increases by a factor of 2. C) The centripetal acceleration increases by a factor of 4. D) The centripetal acceleration is decreased by a factor of onehalf. E) The centripetal acceleration is decreased by a factor of onefourth. Ans: C SectionDef: Section 5-1 and 5-2

2. A car enters a horizontal, curved roadbed of radius 50 m. The coefficient of static friction between the tires and the roadbed is 0.20. What is the maximum speed with which the car can safely negotiate the unbanked curve? A) 5 m/s B) 10 m/s C) 20 m/s D) 40 m/s E) 100 m/s Ans: B SectionDef: Section 5-4

3. A constant force of 25 N is applied as shown to a block which undergoes a displacement of 7.5 m to the right along a frictionless surface while the force acts. What is the work done by the force? A) B) C) D) E)

zero joules +94 J 94 J +160 J 160 J Ans: E SectionDef: Section 6-1 and 6-2 4. During the construction of a high rise building, 40-kg block is vertically lifted 20 meters from the surface of the earth. To one significant figure, what is the change in the

gravitational potential energy of the block? A) +800 J B) 800 J C) +8000 J D) 8000 J E) zero joules Ans: C SectionDef: Section 6-3 and 6-4 5. A pebble rolls off the roof of Science Hall and falls vertically. Just before it reaches the ground, the pebble's speed is 17 m/s. Neglect air resistance and determine the

height of Science Hall. A) 42 m B) 33 m C) 26 m D) 21 m E) 15 m Ans: E SectionDef: Section 6-5 6. A 1.0-kg ball has a velocity of 12 m/s downward just before it strikes the ground and bounces up with a velocity of 12 m/s upward. What is the change in momentum of the ball?

A) zero kg m/s B) 12 kg m/s, downward C) 12 kg m/s, upward D) 24 kg m/s, downward E) 24 kg m/s, upward Ans: E SectionDef: Section 7-1 7. A sled of mass m is coasting on the icy surface of a frozen river. While it is passing under a bridge, a package of equal mass m is dropped straight down and lands on the sled (without causing any damage). The sled plus the added load then continue along the original line of motion. How does

the kinetic energy of the (sled + load) compare with the original kinetic energy of the sled? A) It is 1/4 the original kinetic energy of the sled. B) It is 1/2 the original kinetic energy of the sled. C) It is 3/4 the original kinetic energy of the sled. D) It is the same as the original kinetic energy of the sled. E) It is twice the original kinetic energy of the sled. Ans: B SectionDef: Section 7-2

Recently Viewed Presentations

• Shift, rotate and XOR tell-tale signs of crypto. Conditional statements. Two interacting instruction classes. ... Initialized read only data: RODATA. Global constants, constant strings. Uninitialized read/write data: BSS. Allocating global data.
• ) Sources of Synergy A procedure for valuing synergy (1) the firms involved in the merger are valued independently, by discounting expected cash flows to each firm at the weighted average cost of capital for that firm. (2) the value...
• Week 5: Listen to British Indian children performing their music. Find out about two types of India instruments. Experiment with drum rhythms and pitch patterns Week 4: Layer sounds together to create a piece of music about a storm. Week...
• Assessing Intervention Fidelity in RCTs: Concepts and Methods Panelists: David S. Cordray, PhD Chris Hulleman, PhD Joy Lesnick, PhD Vanderbilt University Presentation for the IES Research Conference Washington, DC June 12, 2008 * * The C of Item and Scale...
• To avoid this, the United States supported the French during the Vietnam War. By 1954 the United States was paying more than 75 percent of the cost of the war. The French continued to lose battle after battle. Vietminh used...
• Original slide numbers given. Add one to each to offset for this slide. ... Personnel Influencing problem and choice definition. ... How do Tech., Culture & Ethics influence Decision Making? Fuzzy Logic and Neural Networks.
• Outline Materi Perlunya metodologi perancangan Prototyping Model Rapid Application Development (RAD) Model Dynamic System Development Method (DSDM) Spiral Model (Boehm) Incremental Model Metode formal Structured System Analysis & Design Methodology (SSADM) Object-Oriented System Design (OOSD) Unified Modeling Language (UML) Unified...
• STUDIES IN GENESIS APOSTLE RONALD C. HILL, SR. GENESIS 6:5-22 May 18, 2011 May 21, 2011 3. As the oily pitch protected the ark from the floods judgment, so will the blood of Christ protect the believer from the sin's...