Physics - September 2007

An airplane flies 200 km due west from city A to city B and then 290 km in the direction of 27.5° north of west from city B to city C.

a) In straight-line distance, how far is city C from city A?

b) Relative to city A, in what direction is city C?
° north of west

2007-09-17 13:18:24 · 2 answers · asked by loveall 3

A roller coaster moves 200 ft horizontally, then rises 135 ft at an angle of 30.0° above the horizontal. Next, it travels 135 ft at an angle of 40.0° below the horizontal. Use graphical techniques to find the roller coaster's displacement from its starting point at the end of this movement.

magnitude ft
direction ° (measured counterclockwise from the +x axis)

2007-09-17 13:16:39 · 1 answers · asked by loveall 3

Describe how you would find the x- and y-intercept of an equation and apply that method to find the intercepts of y=sqrtx+5.

2007-09-17 13:01:58 · 1 answers · asked by Nicole 5

A certain copper wire has a resistance of 9.8 . At what point along its length must the wire be cut so that the resistance of one piece is 6.0 times the resistance of the other?
1/5 of the length
1/6 of the length
1/7 of the length
****Here I have determined that 1/7 of the length is the correct answer as follows:

6x=L-x
7x=L or 1/7

The book does not give formulas or have similar problems of the following. Help with formulas and calculations would be greatly appreciated.

What is the resistance of each piece?
A) larger piece


B)smaller piece

2007-09-17 13:01:18 · 1 answers · asked by Jessie L 2

is the answer 0 for anything under the 4m

or would it be k2/2

2007-09-17 12:52:40 · 1 answers · asked by sunchicano 2

In my bedroom the window is almost parallel to the door. Imagine where the door knob is being a limbo stick directly across. And there is the window. When it is open the door always slams, even pushing it lightly. When its closed it just shuts normally. Why do you think this is?

2007-09-17 12:49:38 · 9 answers · asked by Anonymous

Tina begins to accelerate at a steady 2.30 m/s^2 at the instant when David passes.
How far does Tina drive before passing David?
What is her speed as she passes him?

2007-09-17 12:26:37 · 2 answers · asked by Anonymous

You're rowing a boat perpindicular to the shore of a river that is flowing at 3 m/s. The velocity of you're boat is 4 m/s relative to the water. What is the velocity of your boat relative to the shore? and what is the component of your velocity parallel to the shore?

2007-09-17 12:26:35 · 1 answers · asked by Anonymous

If Santa slides 10.0 before reaching the edge, what is his speed as he leaves the roof?

2007-09-17 12:25:01 · 2 answers · asked by Anonymous

this is my question
Hans stands at the rim of grand canyon and yodels down to the bottom. He hears his yodel echo back from the canyon floor 5.20sec later. Assume that the speed of sound in air is 340.0m/s. How deep is canyon at this location?
Okay this what i don't understand is i use my equations and i get a result different then the the answer give in the book
and correct answer is 884m and i get is double of it which is 1768, so if anyone could help me understood it and how to get it.

2007-09-17 12:22:56 · 1 answers · asked by Anonymous

If an object weighs 100 Newtons on Earth, is the mass of the object is 100N/9.81m/s^2 = 7.17 kg. Correct?
Is the mass of the object on the moon the same?

So is the mass of an object the same no matter where it is in the universe?

2007-09-17 12:12:58 · 7 answers · asked by cookie 2

You and a friend each drive 50.0 km. You travel at 90 km/h; your friend travels at 95.0 km/h. How long will your friend wait for you at the end of the trip?

I'm not even sure where to start with this problem...

2007-09-17 12:12:07 · 2 answers · asked by Katie E 2

A pendulum is swinging freely. At the top of it's swing

A potential energy = 0
B kinetic energy is a maximum
C potential energy = kinetic energy
D kinetic energy = 0

2007-09-17 12:08:08 · 2 answers · asked by CarzCrashzHeartz 3

Hydrologic pressure in a subterranean aquifer pushes 900 lb of water 80 ft to the surface through a natural spring in 2.0 minutes. How much power is utilized?

2007-09-17 12:06:10 · 1 answers · asked by CarzCrashzHeartz 3

A car traveling 45 km/h slows down at a constant 0.50 m/s^2 just by "letting up on the gas." Calculate the distance the car coasts before it stops, the time it takes to stop, and the distance it travels during the first and fifth seconds. Please show/explain all work.

2007-09-17 12:01:03 · 1 answers · asked by nirmal 1

A world-class sprinter can burst out of the blocks to essentially top speed (of about 11.5 m/s) in the first 15.0 m of the race. What is the average acceleration of this sprinter and how long does it take her to reach that speed? Please show/explain work.

2007-09-17 11:53:52 · 1 answers · asked by nirmal 1

(a) What was the biker's average speed (in m/s) for the trip?
m/s




(b) Could you have just added the average speed values for the 3 different sections of the trip above and divided by 3 to get the correct answer? Please explain fully.

2007-09-17 11:22:05 · 2 answers · asked by ags101 2

In the javelin throw at a track-and-field event, the javelin is launched at a speed of 33 m/s at an angle of 35° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is required for the angle to be reduced from 35° at launch to 17°?

2007-09-17 11:13:38 · 2 answers · asked by polly 1

A cessna 150 aircraft has a lift-off speed of approximately 125 km/h.

a) What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 206m? Answer in units of m/s^2.

b) What is the corresponding take-off time? Answer in units of s.

c) If the aircraft continues to accelerate at this rate, what speed will it reach 32.8 s after it begins to roll? Answer in units of m/s.

2007-09-17 11:13:17 · 1 answers · asked by grouchy187 2

A box is given a push so that it slides across the floor. How far will it goi, given that the coefficient of kinetic friction is .20 and the push imparts an inital speed of 4m/s ?

thanks for the help

2007-09-17 11:04:18 · 1 answers · asked by Krazyk78 1

again???

2007-09-17 11:02:04 · 3 answers · asked by Anonymous

A balloon is rising at 10 m/s when its passenger throws a ball straight up at 12 m/s.how much later does the passenger catch the ball?

2007-09-17 10:58:02 · 1 answers · asked by M R 1

and elasctically bounced upward from concrete sidewalk.

What is velocity of the ball 1/4 second after the bounce?

g = 10m/s2

2007-09-17 10:52:12 · 2 answers · asked by Alexander 6

please ansewer quick1!!!

2007-09-17 10:45:48 · 7 answers · asked by Anonymous

I'm not looking for the answer to this so much as looking for what I need to do to get the answer. So please explain to me how I go about it. Thanks!

Part 1

A particle has initial horizontal Velocity of 2.9 m/s and initial upwards velocity of 4.9 m/s. It then has a horizontal acceleration of 1.5 m/s^2 and downward acceleration of 2.1m/s^2. What is the speed after 1.8 s? Answer in m/s.

Part 2

What is the direction of its velocity at this time with respect to the horizontal? Answer between -180 and +180 degrees

2007-09-17 10:41:27 · 5 answers · asked by BossGoomba 1

a ball is projected off a 100m high cliff at a horizontal speed of 10 m/s.

a) calc. how long the ball takes to hit the sea.
b) calc. horizontal displacement of the ball.
c) calc. the vertical velocity of the ball as it hits the sea.
d) calc. the velocity of the ball as it hits the sea.

2- an archer fires an arrow at a 60m distant target, the arrow leaves the bow at 28m/s at an angle of 25 degrees above the horizontal.

a) what is the horizontal component of the velocity?
b)how long does the arrow take to reach the target ( hits the bulls eye)
c)what is the velocity of the arrow as it hits the target?


3- a golf ball is hit at a velocity of 30m/s at an angle of 30 degrees above the horizontal.

a)calc. max. height of ball
b)the horizontal dist. of the ball.


please help, and please show working

please at least help me do one of these, or show how to do them, like formulae nd stuff,
thanks a lot for any help :) :) +++best answers

2007-09-17 10:32:53 · 1 answers · asked by Anonymous

Both of them will eventually reach same terminal velocity v = 75 m/s.

What will be eventual vertiacal separation of the balls?

2007-09-17 10:26:01 · 2 answers · asked by Alexander 6

What role does gravity play into these circumstances? Does mass? (if so, how much would something have to weigh in order to achieve this). Any other forces? Do all these animals have specially designed feet? Please answer seriously if you know the answer.

2007-09-17 10:12:27 · 4 answers · asked by Anonymous

I'm confused!!!
http://s223.photobucket.com/albums/dd78/floodtl/?action=view¤t=JAck-1.jpg

2007-09-17 10:07:23 · 6 answers · asked by Anonymous

A worker drops a wrench from the top of a tower 57.0 m tall. With what velocity does the wrench strike the ground?

2007-09-17 10:02:50 · 3 answers · asked by Anonymous