PHYS Straighterline Review Questions and Answers, Rated A+

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PHYS Straighterline Review Questions and Answers, Rated A+ 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? - Ans-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? - Ans-5 Which of the following is involved in uniform circular motion? - Ans-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? - AnsToa > To How can you calculate the magnitude of a vector using scalar products? - Ans-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? - Ans-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. - Ans-false Which of the following statements concerning friction between the surfaces of two objects is correct? - Ans-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. - Ans-606 mWhich of the following statements concerning friction is incorrect? - Ans-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? - Ans-0.5 m / s2 If the cross product of a vector of length 5 and a vector of length 3 results in a vector of length 10, what is the angle between them? - Ans-42° A vector is quantity that requires both magnitude and ________. - Ans-direction King Kong is holding a woman on top of a skyscraper when she suddenly slips out of his hand. How tall is the building if Superman has a minimum time of 2.30 s to catch the woman before she hits the ground? - Ans-25.9 m Kylie throws Kyra a kiwi. The kiwi leaves Kylie's hand at a height of 1.3 m from the ground and Kyra grabs it out of the air at a height of 1.6 m. Kylie throws the kiwi at an angle of 33° relative to the horizontal. The kiwi is in the air for 1.1 s. How far apart are Kylie and Kyra standing? (Assume there is no drag force that no wind is blowing.) - Ans-9.6 m A projectile is launched from a height of 250 m with initial horizontal velocity of 50 m/s. What is the horizontal range of the projectile? - Ans-357 m Imagine that you push down on an object that is sitting on a frictionless table. Which of the following diagrams includes all the forces acting on the object? - Ans-F W down, N up Your cat chases a spider across the floor. Its position is a function of time is r + (1.2m/s)ti + (0.7m + (0.5m/s2)t2)j, where the origin is the southwest corner of the floor. Find the average speed of the cat between t = 0.0s and t = 4.0s - Ans-2.3 m/s The position of an object along the x-axis is described by the formula x = 3t 2 − 2t. Which of the following are the correct formulas for the velocity and acceleration of the object? - Ans-v = 6t − 2, a = 6Using the conversion factor between kilograms and pounds, 1 kg = 2.205 lb, calculate how many pounds are in 2.00 kg. - Ans-4.41 lb [Show More]

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