2:06 PM ..ooo AT&T; 1 99% learning semo edu Homework 1 (Spring 2017) PH120 Intro

Question

2:06 PM ..ooo AT&T; 1 99% learning semo edu Homework 1 (Spring 2017) PH120 Introductory Physics I Due date: (Tuesday) January, 31.2016 1. Suppose the vectors A and B in the drawing have magnitudes ol 60 and are directed as shown. What are A, and B, the scalar compoaeuts of A and B along the x axis? 60 2. A spring is hanging down from the ceiling, and an object of mass m is attached to the free end. The object is pulled down, thereby stretching the spring, and then released. The object oscillates up and down, and the timei required for one complete up-and-dowm oscillation is given by the equation T 2 Vm/k, wherek is known as the spring constant. What must be the dimension of for this equation to be dimensioually correct? 3. The tail of a vector is fixed to the origin of an x y axis system. Orig- inally the vector points along the +x axis and has a magnitude of 12 units. As time passes, the vector rotates courterclockuise. For which of the following rotational angles is the x component of the vector equal to zero? (a) 90 degrees (b) 180 degrees (c) 270 degrees (d) 360 degrees 4. The mass of a raindrop is 4 milligraus. Which one of the following statements indicates the correct mass of the raindrop graaus? (a) The raindrop has a mass of 4 x 10' grams.

Explanation / Answer

Ans (1) Scalar component of A

Ax= -Acos theta

= -6cos35= -4.91 m

scaler component of B

Bx= Bcos35= 6cos35= 4.91 m

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