Ablock rests on a frictionless horizontal surface and is attached to a spring. when set into simple harmonic motion, the block oscillates back and forth with an angular frequency of 7.4 rad/s. the drawing shows the position of the block when the spring is unstrained. this position is labeled ''x = 0 m.'' the drawing also shows a small bottle located 0.080 m to the right of this position. the block is pulled to the right, stretching the spring by 0.050 m, and is then thrown to the left. in order for the block to knock over the bottle, it must be thrown with a speed exceeding v0. ignoring the width of the block, find v0.

v₀ = 0.462 m / s

Explanation:

The spring block system results in an oscillatory movement described by the equation

    x = A cos (wt + φ)

Where A is the amplitude of the movement

Let's analyze the situation presented give the angular velocity, the elongation for t = 0 , and they ask me to hit a bottle that is at x = 0.050 m. The speed is given by

    v = dx / dt

    v = -A w sin (wt + φ)

For the block to hit the bottle the range of motion must be equal to the distance of the bottle

    A = 0.080 m

For t = 0

    x (0) = A cos φ

Let's calculate the phase

    cos φ = x (0) / A

    φ= cos⁻¹ (0.5 / 0.8)

    φi = 0.8957 rad

Let's use the speed equation

    v₀ = -A w sin φ

    v₀ = - 0.080 7.4 sin 0.8957

    v₀ = 0.462 m / s

that would be b i just took the test : )

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.