Recall Newton's second law:

F = ma

F is the force exerted on the object.

m is the mass of the object.

a is the acceleration of the object.

Given values:

F = 75 N

m = 15 kg

Substitute the terms in the equation with the given values and solve for a:

75 = 15×a

<h3>a = m/s²</h3>

Standard sea level pressure by definition equals 760 mm (29.92 inches) of mercury

**Hooke's Law** states that the **force **that the **spring **exerts on the mass in a **mass-spring system** is opposite of and proportional to the **displacement **of the mass from equilibrium. The statement is True.

<h3>What is force?</h3>

The **force** is an action of push or pull on any object to change the state of **motion **or **rest**.

The** Hookes's law** is related to the spring force. The** force F **is applied on the mass connected to **spring **to compress or extend it about the **equilibrium position** at distance x. When **force **is removed, the mass attached to the **spring **moves in opposite direction of **force**.

The larger the **force**, longer is the distance from equilibrium position. This concludes that the** Hooke's law** is correct.

Thus, the statement is True.

Learn more about **force**.

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You are given a star that is located 12.5 parsecs away from us (let us assume that the reference point is on earth). You are tasked to find the parallax angle. The equation to get the parallax angle is D = 2 (AU)/ tanФ wherein D is the distance of the star from the earth, AU is the distance of earth from the sun and Ф is the parallax angle. Note that 1 parsec = 1,000,000,000,000 million meters and that the distance of earth to the sun is about 149,600,000,000 meters.

D = 2 (AU)/ tanФ

tan Ф = 2 (AU)/D

Ф = tan⁻¹ [ 2(AU) / D]

Ф = tan⁻¹ [ 2(149,600,000,000) / 12,500,000,000,000]

**Ф = 1.37°**