Dustin Mckinley

Numerade Educator
STEM Student

Biography

My name is Dustin Mckiney I'm from Indiana and studied mechanical engineering technologies at Purdue, finishing in spring of 2022. Currently I'm a practicing engineer at Samtec incorporated. I've always been drawn to STEM and feel that these sorts of fields build the future. I'm happy to help the next generation of STEM students!

Education

Dustin has not yet added their education credentials.

Educator Statistics

Numerade tutor for 4 years
14 Students Helped

Topics Covered

Mastering Motion: Achieving Efficiency Along a Straight Line
Mastering Newton's Laws: Tips for Applying Them Effectively
Discovering the Fundamentals: Newton's Laws of Motion Explained

Dustin's Textbook Answer Videos

04:37
University Physics with Modern Physics

Human Biomechanics. The fastest pitched baseball was measured at 46 $\mathrm{m} / \mathrm{s}$ . Typically, a baseball has a mass of 145 $\mathrm{g}$ . If the pitcher exerted his force (assumed to be horizontal and constant) over a distance of $1.0 \mathrm{m},(\mathrm{a})$ what force did he produce on the ball during this record-setting pitch? (b) Draw free-body diagrams of the ball during the pitch and just after it left the pitcher's hand.

Chapter 4: Newton's Laws of Motion
Dustin Mckinley
03:08
University Physics with Modern Physics

BIO Human Biomechanics. The fastest served tennis ball, served by "Big Bill" Tilden in $1931,$ was measured at 73.14 $\mathrm{m} / \mathrm{s} .$ The mass of a tennis ball is $57 \mathrm{g},$ and the ball is typically in contact with the tennis racquet for $30.0 \mathrm{ms},$ with the ball starting from rest. Assuming constant acceleration, (a) what force did Big Bill's racquet exert on the tennis ball if he hit it essentially horizontally? (b) Draw free-body diagrams of the tennis ball during the serve and just after it moved free of the racquet.

Chapter 4: Newton's Laws of Motion
Dustin Mckinley
04:33
University Physics with Modern Physics

Two crates, one with mass 4.00 $\mathrm{kg}$ and the other with mass $6.00 \mathrm{kg},$ sit on the frictionless surface of a frozen pond, connected by a light rope (Fig. P4.43). A woman wearing golf shoes (so she can get traction on the ice) pulls horizontally on the 6.00 -kg crate with a force $F$ that gives the crate an acceleration of 2.50 $\mathrm{m} / \mathrm{s}^{2} .$ (a) What is the acceleration of the 4.00 -kg crate? (b) Draw a free-body diagram for the 4.00 -kg crate. Use that diagram and Newton's second law to find the tension $T$ in the rope that connects the two crates. (c) Draw a free-body diagram for the 6.00 -kg crate. What is the direction of the net force on the 6.00 -kg crate? Which is larger in magnitude, force $T$ or force $F ?(\mathrm{d})$ Use part $(\mathrm{c})$ and Newton's second law to calculate the magnitude of the force $F .$

Chapter 4: Newton's Laws of Motion
Dustin Mckinley
04:07
University Physics with Modern Physics

Insect Dynamics. The froghoper (Philaenus spumarius), the champion leaper of the insect world, has a mass of 12.3$\mathrm{mg}$ and leaves the ground (in the most energetic jumps) at 4.0 $\mathrm{m} / \mathrm{s}$ from a vertical start. The jump itself lasts a mere 1.0 $\mathrm{ms}$ before the insect is clear of the ground. Assuming constant acceleration, (a) draw a free-body diagram of this mighty leaper while the jump is taking place; (b) find the force that the ground exerts on the frog hoper during its jump; and (c) express the force in part (b) in terms of the froghopper's weight.

Chapter 4: Newton's Laws of Motion
Dustin Mckinley
06:03
University Physics with Modern Physics

$\bullet$$\bullet$$\bullet$ A hot-air balloon consists of a basket, one passenger, and
some cargo. Let the total mass be $M .$ Even though there is an
upward lift force on the balloon, the balloon is initially accelerating downward at a rate of $g / 3 .$ (a) Draw a free-body diagram for
the descending balloon. (b) Find the upward lift force in terms of
the initial total weight $M g .$ (c) The passenger notices that he is
heading straight for a waterfall and decides he needs to go up.
What fraction of the total weight must he drop overboard so that
the balloon accelerates upward at a rate of $g / 2 ?$ Assume that the
upward lift force remains the same.

Chapter 4: Newton's Laws of Motion
Dustin Mckinley
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Dustin's Quick Ask Videos

05:40
Physics 101 Mechanics

A flea jumps by exerting a force of 1.32 10-5 N straight down on the
ground. A breeze blowing on the flea parallel to the ground exerts
a force of 1.20 10-6 N on the flea.
Find the direction and magnitude (in m/s2) of the
acceleration of the flea if its mass is 6.0 10-7 kg. (Let us assume
that Fwind points to the
right. We will consider this to be
the +x direction and vertical to be
the +y direction.)

Dustin Mckinley
03:28
Algebra

(Work backward)
Later today, your mom will take you to the doctor's clinic for a check-up.
"When do you think we should leave?" she asks. "Help me decide."
Since she always has errands to run, you ask her, "What do we have to do on the way?"
She answers, "I'd like to go to the dry cleaners in the mall, and then let's have lunch at the restaurant in the mall. Then we can get dog food at the pet shop and money at the bank. And then we can go to see the doctor."
"Okay," you tell her, "let's say that it takes 20 minutes to drive to the mall and park, and 10 minutes to get the dry cleaning, then 45 minutes for lunch, 10 minutes to get dog food, and 10 minutes to get money at the bank. After that, we'll need 20 minutes to drive to the doctor's clinic. What time is our appointment?"
"Our appointment is at 2:00 p.m., so when should we leave?

Dustin Mckinley
03:46
Physics 101 Mechanics

A 1.7×10^4 kg rocket has a rocket motor that generates 2.9×10^5 N of thrust. At an altitude of 5000 m, the rocket's acceleration has increased to 7.9 m/s^2. What mass of fuel has it burned? Express your answer to three significant figures and include the appropriate unit.

Dustin Mckinley
02:21
Geometry

'State the measure (in degrees) of the angle formed between the minute hand and the hour hand of clock when the time is each of the following:
(a) 12:30 p.m:
(b) 1:20 a.m_'

Dustin Mckinley
05:04
Algebra


If an older television with an aspect ratio of 4:3 has a screen of 2400 square inches, but the image has a letter box and is displayed with an aspect ratio of 16:9, how much area does the image actually occupy?

Dustin Mckinley
01:16
Principles of Accounting

You have $30,000 and decide to invest on margin. If the initial margin requirement is 60 percent, what is the maximum dollar purchase you can make? (Round your answer to the nearest whole number.)

Dustin Mckinley
1 2