PHYS Straighterline| 234 QUESTIONS| WITH COMPLETE SOLUTIONS

An amusement park game consists of throwing a quarter into a small bowl. If you win, you get to take home a giant purple stuffed elephant. The dish is on a shelf that is 0.4 m above the point where the quarter leaves your hand. The horizontal distance between the bowl and the place where the quarter leaves your hand is 1.8 m. Ignoring air drag, if you toss the quarter at an angle of 60°, what initial velocity is needed to bring home the giant purple stuffed elephant? CORRECT ANSWERS: 4.8 m / s If the x-component of a vector is 3 and the y-component is 4, what is the magnitude of the vector? CORRECT ANSWERS: 5 Which of the following is involved in uniform circular motion? CORRECT ANSWERS: constant angular velocity As shown, a crate of oranges and a crate of apples, each with a different mass, are attached by a rope (with tension Toa). A second rope (To ) is attached to the crate of oranges, and the entire system is pulled with a constant acceleration a by this rope. Which of the following is true of the tensions? CORRECT ANSWERS: Toa > To How can you calculate the magnitude of a vector using scalar products? CORRECT ANSWERS: Multiply it by itself and take the square root. Suppose you weigh an object and the reading you get from the scale is 0.0070 kg. How many significant digits does your measurement have? CORRECT ANSWERS: Two Consider two objects sliding down an incline without rolling. If the objects don't have the same mass, the heavier object will accelerate at a faster rate than the lighter one. CORRECT ANSWERS: false Which of the following statements concerning friction between the surfaces of two objects is correct? CORRECT ANSWERS: The force of friction mostly depends on the nature of the two surfaces. Calculate x=vt+1/2at2, where v = 0.227 m/s. t = 11.1s, and a = 9.80 m/s2. CORRECT ANSWERS: 606 m Which of the following statements concerning friction is incorrect? CORRECT ANSWERS: The force of static friction ( fs ) between parallel surfaces in contact is given by: fs = μsN. A car travels with a speed of 3.5 m / s, and then accelerates to 5.5 m / s in 4 s. Which of the following is the average acceleration of the car? CORRECT ANSWERS: 0.5 m / s2 If the cross product of a vector of length 5 and a vector of length 3 res