All categories

3 years ago

An object is held at rest and allowed to drop How far does the object fall in 3.3 seconds?

1 answer:

6 0

After x seconds, an object will fall $\frac{1}{2}at^2$ where a is acceleration due to gravity and t is time

so when t=3.3
the distance it will fall is $(\frac{1}{2})(9.8\frac{m}{s^2})(3.3m)^2$ =53.361m
it will fal 53.361 meters

You might be interested in

List and define 4-5 waste materials from copper ore processing

frozen [14]

<span>Four waste materials from copper ore processing are: ore minerals, unwanted rock or gangue, uranium, and pyrite/sulfide minerals. Ore minerals are contained in rock and have potential to be economically extracted, gangue may contain silicate minerals for which there is no economic value, uranium is a frequently-occurring radionuclide found in ore bodies, and pyrite and sulfide minerals may be found in tailings piles during copper processing.</span>

4 0

4 years ago

1. Which has more kinetic energy, a 40 kg cheetah running at 25 m/s or a 4,000 kg elephant moving at 2 m/s? How much more energy

s2008m [1.1K]

Answer:

1. The elephant has more kinetic energy at this speed and mass. It has 4,500 J more KE.

2. The elephant would have to go at a speed of 2.5 m/s to reach the same KE as the cheetah.

Explanation:

You would use the formula KE=1/2mv^2.

This formula would be filled in and completed twice, once for the elephant and once for the cheetah.

Cheetah:

KE = 1/2 (40) (25) ^2

KE = 12,500 J

Elephant:

KE = 1/2 (4,000) (2) ^2

KE = 8,000 J

This shows that the cheetah has more KE.

Then you would subtract the elephants amount of J from the cheetahs to find the difference.

Difference = 12,500 J - 8,000 J

Difference = 4,500 J

I hoped this helped with the first part :)

For the second part:

To find the speed the elephant would have to run you would fill in and complete the equation once more with different distance results.

KE = 1/2 (4,000) (2.5) ^2

KE= 12,500 J

7 0

3 years ago

A map of eastern North America, showing the pH of rainfall in the various states, indicates that the pH of rain in New York Stat

pogonyaev

4.22

Explanation:

The most acidic rainfall in New York State will have pH of 4.22 whereas the least acidic will be that of 4.40.

The pH scale expresses the acidity or alkalinity of aqueous solutions.

The pH scale ranges from 1 to 4
An acidic solution will have a pH value less than 7

We have given a range of values between 4.22 to 4.40

This implies that the pH values of rainfall in this region falls between these extremes.

The least value 4.22 is the most acidic

The value 4.4 is the the least acidic

The lower the pH value, the more acidic a solution is.

Learn more:

pH brainly.com/question/12985875

#learnwithBrainly

6 0

3 years ago

A 75 g bullet is fired from a rifle having a barrel 0.650 m long. Assuming the origin is placed where the bullet begins to move,

kolbaska11 [484]

Answer:

7557.875 J

Explanation:

Assumimg we need to find work done by the bullet on the gas

The work is found by integrating force over distance

W= $W=\int_{x_i}^{x_f}F.ds$

For the force in this problem we have

$W=\int_{0}^{0.65}14000 + 10000x - 21000x^2.ds$

= $[14000x+10000x^2-21000x^3]_{0}^{0.65}$

=7557.875 J

8 0

3 years ago

You are comparing a reaction that produces a chemical change and one that produces a physical change. What evidence could you us

Lynna [10]

Answer: A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.

Explanation: hope this helps have a good day

7 0

4 years ago