**Answer:**

**W = -148.8 J**

**Explanation:**

given,

mass = 9.2 kg

initial speed = 1.42 m/s

pulling force = 94 N

angle θ = 19.6°

coefficient of kinetic friction = 0.400

the crate is pulled = 4.92 m

to calculate of work done by the gravitation force

gravitation force

W = ( m g sin θ ) x

W = 9.2 × (-9.8) × sin 19.6° × 4.92

**W = -148.8 J **

Work done by the gravitation force is taken as negative because gravitation force act opposite to the force applied.

**Answer:**

it yields a derived unit known as Newton, which is the unit of Force.

**Explanation:**

The formula for force is given by Newton's Second Law, which states that whenever an unbalanced force is applied to a body, it produces an acceleration in the body in the direction of force.

where, F = Force

m = mass

a = acceleration

Now, we substitute the respective S.I units of each quantity in equation:

F = Newton (N)

m = kilogram (kg)

a = acceleration = m/s²

Therefore,

So, it is clear from above expression that:

<u>**When kilogram is multiplied by meter per second squared, it yields a derived unit known as Newton, which is the unit of Force.**</u>

**Answer:**

1.53 cm

**Explanation:**

The relationship between wavelength and frequency for a wave is:

where

v is the speed of the wave

f is the frequency

is the wavelength

In this problem, we have:

is the frequency of the ultrasound wave

is the speed of sound in sea water at room temperature

Re-arranging the previous equation and solving for , we find the wavelength of the ultrasound wave:

At any **crime** scene, the two greatest challenges to the physical evidence are **contamination** and loss of **continuity**.

<h3>What is the meaning of physical evidence?</h3>

In **evidence** law, physical evidence (also called real evidence or material evidence) is any **material **object that plays some role in the matter that gave rise to the litigation, introduced as **evidence** in a judicial proceeding (such as a trial) to prove a fact in issue based on the object's physical **characteristics**.

The two types of evidence at **crime **scenes:

**Biological **evidence (e.g., blood, body fluids, hair and other tissues)

**Latent** print evidence (e.g., **fingerprints**, palm prints, footprints)

The biggest **impediment **to an investigation is the **removal** or loss of a piece of **evidence** from the scene of a crime.

Hence, at any **crime** scene, the two **greatest **challenges to the physical evidence are **contamination** and loss of continuity.

Learn more about the **physical **evidence here:

brainly.com/question/13505766

#SPJ1

If the object is at equalibirium, then the force is balanced. '<em>Balanced</em>' is the key word that is used to describe equilibrium situations. If the object has a zero net force, the acceleration is 0 m/s/s. Objects at equilibrium should have an acceleration of 0 m/s/s.