# speed

1. ### Projectile Motion Using Vectors

http://assets.openstudy.com/updates/attachments/51cd2a0be4b011c79f63705f-rms13-1372647113150-porh.pdf Hi I need help with question 8 in this pdf. The speed = radius(u'(t)). r=10, so u'(t)=4pi(e^-t) and u(t)=-4pi(e^-t). The position vector r(t)=<10cos(-4pi(e^-t)),10sin(-4pi(e^-t))>. How do you...

3. ### Finding instantaneous speed

This is for the first question... Please refer to the image for my question.
4. ### Change in Angle of Elevation

A motorist, traveling along a level highway at a speed of 60 km/hr directly toward a mountain, observes that between 1:00 P.M. and 1:10 P.M. the angle of elevation changes from Theta = 0.17 to Theta = 1.2. Approximate the height of the mountain.
5. ### Water Speed and Min/Max

I'm thinking it's the slowest when it's at a minimum -220(1-\dfrac{1}{50}t) = 0 -\dfrac{1}{50}t = 1 t = 50 2nd derivative test. (-\dfrac{1}{50})-220(1-\dfrac{1}{50}(t)) (-\dfrac{1}{50})-220(1-\dfrac{1}{50}(-50)) = -\dfrac{1}{50} - negative so max at 50
6. ### Average velocity and average speed

What is the difference here?
7. ### Speed on an Interval

Is this correct? In order to find out on which intervals something is slowing down, or speeding up, then you have to: 1. Do the 1st derivative test on each interval (intervals divided by critical points) to see where the velocity has a positive sign (increasing) or negative sign (decreasing)...
8. ### The Angry Dog

Imagine you were standing in the middle of a circle-shaped pool of radius R. On the border of the pool there is a big and dangerous dog, wich is about to run after you, catch you, and slay you. You have to escape somehow, but sadly the dog can swim four times faster than you, and it's also very...
9. ### Drop time, Gravity, Target Speed

I need to find the drop time of the ball, the gravity of the ball, and the speed of the target. I am not giving a formula to try and figure out the answer, just the information given.
10. ### [PChem] Maxwell-Boltzmann Molecule Mean Speed

Hi, I am having trouble with this concept... "A mean speed (c) is calculated by multiplying each speed by the fraction of molecules that have that speed, and then adding all the products together. When the speed varies over a continuous range, the sum is replaced by an integral. To employ this...
11. ### Find the Bearing

A boat leaves a certain port at 11:40 A.M. and moves S 60 W at 9 km/h. At noon another boat leaves the same port and travels N 30 W at 10 km/h. Find the bearing (to the nearest degree) of the second boat from the first boat at 2 P.M.
12. ### Choose The Prowess Of GC Speed Slim Weight Loss In France

GC Speed Slim weight loss in France is definitely the most effective resolution for an obese dude who suffers from obesity. It is a natural diabetic complement to lessen challenges of overweight trimming the excess fat. It really is made from organic factors like espresso beans to speed up the...
13. ### Effect of change of Speed

Hi there, I am wondering if someone could guide me through a problem. I have the following data (derived from a horse race): The distance is 1760 yards (1 mile). The standard (expected) time is 96.04s. Thus the avg speed to attain this is 18.32yps. The distance is broken down into two...
14. ### Average Rate of Change of a Function. Instantaneous Speed of a test tube.

I studied this for a while and I found I developed a question about c). I feel I understand whats being calculated at c to a good degree but I still wonder about why h(5) suddenly moves to the right when in the previous a) and b) the large h(+) is on the left. I see that in a) and b) this is...
15. ### Instantaneous speed of a car.

I am trying to find an instantaneous speed of a car s = 4.4t^2. I have all my steps drawn out in the attached image. It looks like I am off by half but I don't see why yet or how to adjust things.
16. ### Twinkling/Blink of An Eye Speed

How much faster is the twinkling of an eye compared to the blink of an eye? Is there a math formula or equation to find the speed for both?
17. ### x^4-4x^2+y^3-4y=0 zero points for speed

I have the equation, x^4-4x^2+y^3-4y=0, in which I need to find all of the places that the speed of this equation is 0. I used implicit differentiation to get that the derivative is: -4x(x^2-2)/(3y^2-4) So I then go for making the numerator equal zero, and get that x=0 or -sqrt2 or sqrt2. I...
18. ### Find the speed of the football when it is released.

What am I doing wrong... The quarterback of a football team releases a pass at a height of 8 feet above the playing field, and the football is caught by a receiver 38 yards directly downfield at a height of 4 feet. The pass is released at an angle of with the horizontal. Find the speed of the...
19. ### dependence speed to time, physics

dependence speed to time, physics like in puctyre : http://www.x3m.biz/11a.png
20. ### dependence speed to time, physics

dependence speed to time, physics picture : http://www.x3m.biz/11b.png