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**Answer:**

What are Newton's 1st 2nd and 3rd laws of motion?

They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces. More precisely, the first law defines the force qualitatively, the second law offers a quantitative measure of the force, and the third asserts that a single isolated force doesn't exist.

**Explanation:**

They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces. More precisely, the** first law** defines the force qualitatively, the **second law** offers a quantitative measure of the force, and **the third asserts** that a single isolated force doesn't exist.

Question

83. A racquet ball is struck in such a way that it leaves the racquet with a speed of 4.87 m/s in the horizontal
direction. When the ball hits the court, it is a horizontal
distance of 1.95 m from the racquet. Find the height of
the racquet ball when it left the racquet.

Solution 1

The height of the racquet ball Â is **0.8 m**.

Since the ball hits the court at a **horizontal distance** of **1.95 m** from the racquet, hence the range is **1.95 m.**

**Range = velocity * time**

1.95 = 4.87 * t

**t = 0.4 s**

Hence it took **0.4 s **for the ball to land. The height (h) is:

h = (1/2)gtÂ²

but **g = acceleration due to gravity = 10 m/sÂ²**, hence:

h = (1/2)*10*0.4Â² = **0.8 m**

Therefore the height of the racquet ball Â is **0.8 m**.

Find out more at: brainly.com/question/11422992

Solution 2

**Answer:**

0.7864m

**Explanation:**

Ignore air resistance (the ball's horizontal speed stays constant), the time it takes for the ball to travel 1.95 m horizontally at the rate of 4.87 m/s.

t = 1.95 / 4.88 = 0.4s

This is also the time it takes to fall vertically with gravitational acceleration of g = 9.81 m/s2. We can use the following equation of motion to estimate the vertical distance:

Question

Explain how the principle of uniformitarianism would help geologists determine the source of a layer of particular igneous rock ?

Solution 1

The **uniformitarianism **principle would aid **geologists **in determining the origin of a layer of specific igneous rock that **rocks changing **forms.

**Uniformitarianism **provided us with a tool for **interpreting **the geologic past. In fact, geologists frequently **summarize **the concept as "the gift is the crucial **component **to the past." The concept is used to describe all types of tectonic processes. The other major **tenet **of uniformitarianism is that the Earth is a very old place.

The best **approach **to the past is in the present. He referred to this as the concept of **uniformitarianism**. It is that if we can comprehend a geomorphological process now and find **proof **of that same methodology in the past, we can presume that the process worked **similarly **in the past.

Therefore, it can be concluded that Â **rocks changing **forms helps to understand the concept of **uniformitarianism **that helps in the identification of the **rocks**.

Learn more about **uniformitarianism **here:

#SPJ2

Solution 2

**Answer:**

Uniformitarianism gave us a tool to interpret the geologic past. In fact, geologists sometimes summarize the concept in the phrase: The present is the key to the past. The concept is applied to all types of geologic processes. ... The other big idea inherent in uniformitarianism is that Earth is a very old place.

**Explanation:**

Question

what happens to the gravitational force when the distance between them stays the same and the mass of both objects is doubled

Solution 1

**Answer:**

The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.

**Explanation:**

Question

Internal energy changes that do not register on a ther

Solution 1

**Answer: Internal energy changes that do not register on a thermometer are due to changes in the potential energy of the particles.**

**Explanation: a thermometer measures the temperature, which is a measure of the average kinetic energy of the particles. **

Question

A dog chases a car, running 825 m west in 6.22 s. What is the average velocity of the dog?

Solution 1

Answer:

132.64m/s

Explanation:

Averagevelocity= distance/time

From the question, the distance d = 825m

time t = 6.22 secs

Using the above formula

We have

average velocity = 825/6.22

= 132.64m/s

Question

A sprinter, running a 100-meter race, can accelerate with a constant acceleration for 4.10 s before reaching his top speed. He can then can maintain that speed for the rest of the race. He runs the 100 meters in 10.0 s. What is the runner's speed as he crosses the finish line?

Solution 1

**Answer:**

=12.579m/s

**Explanation:**

with constant acceleration the displacement is calculated as follows

Î”x=(+)t/2

for the first 4.10s the is the top speed so, and, for the other Â 5.9s, the speed is constant with value , Â so:

100 m =*(10-4.1s)+ (0+)4.1s/2

so =100/(5.9+2.05)=12.579m/s

Solution 2

**Answer:**

12.579m/s:with constant acceleration the displacement is calculated as follows Î”x=(+)t/2for the first 4.10s the Â is the top speed so, and, for the other Â 5.9s, the speed is constant with value , Â so:100 m =*(10-4.1s)+ (0+)4.1s/2so =100/(5.9+2.05)=12.579m/s

**Explanation:**

Question

What does the magnitude of centripetal acceleration depend on ?

Solution 1

**Explanation:**

Centripetal acceleration ac is the acceleration experienced while in uniform circular motion. It always points toward the center of rotation. It is perpendicular to the linear velocity v and has the magnitude ac=v2r;ac=rÏ‰2 a c = v 2 r ; a c = r Ï‰ 2 .

Question

A trip is taken that passes through the following points in order Point A 0 m
Point B 15.0 m
Point C -30.0 m
Point D -20.0 m
Point E 10.0 m
Point F 5.0 m
What is the distance from Point A to Point E?

Solution 1

**Answer:**

15? I actually don't know

Question

Often in Physics we will show a frame of reference as a

Solution 1

**Answer:**

In physics, a frame of reference, or reference frame, is a perspective that one uses to determine if an object is moving.

**Explanation:**

Question

In which of these examples is the greatest movement occurring? A) A
B) B
C) C
D) D

Solution 1

**Answer:**

The answer is C because it has the most movement going in one direction.

**Explanation:**

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