Physics - September 2007

2007-09-13 14:25:10 · 1 answers · asked by abbs 2

2007-09-13 14:19:38 · 1 answers · asked by . 2

A speedboat starts from rest and accelerates at +2.01m/s^2 for 7.00s. At the end of this time, the boat continues for an additional 6.00s with an acceleration of +0.518m/s^2. Following this, the boat accelerates at -1.49m/s^2 for 8.00s. a) What is the velocity of the boat at t=21.0s. b) Find the total displacemnt of the boat.

2007-09-13 14:18:01 · 2 answers · asked by Anonymous

Example:girl playing basketball

or

sled positioned at top of hill

What types of energy would these fall under? I'm really confused. If someone could explain to me the difference between all 3 of those types of energy that would be great.

2007-09-13 13:59:36 · 3 answers · asked by Anonymous

Please help me with my physics study question, I'm not sure how to set up an equation for it:?
In Denver, children bring their old pumpkins to the top of a tower and compete for accuracy in hitting a target on the ground. Suppose the tower is 9.0m tall and that the bull's eye is a horizontal distance of 3.5m from the launch point. If the pumpkin is thrown horizantally what is the launch speed needed to hit the target?

2007-09-13 13:36:50 · 1 answers · asked by lorinkuuipo 1

Two people run at the same average speed. Runner A cuts directly north across the diameter of the circular track, while Runner B takes the full semicircle to meet his partner on the opposite side of the track. Assume their common average speed is 2.70 m/s and the track has a diameter of 150 m. (a) How many seconds ahead of runner B does runner A arrive? (b) How do their travel distances compare? (c) How do their displacements compare? (d) How do their average velocities compare?

Does anyone know how to work this problem? Your help will be greatly appreciated!

2007-09-13 13:34:49 · 1 answers · asked by ~BuBbLy~ 1

a dragster completes a 1/4 mile drag strip run, going from 0 to 284 mph in 4 seconds. He then covers 3/4 mile while slowing down to a stop in 14 seconds.

2007-09-13 13:32:05 · 1 answers · asked by Scarlet 1

http://www.webassign.net/giancoli5/2_27.gif

(a) In Fig. 2-27, a graph of velocity vs. time, estimate the distance the object traveled during the first minute.
[ m ] ?
(b) What is the distance traveled during the second minute?
[ m ] ?

2007-09-13 12:46:43 · 1 answers · asked by gatoona 1

The position of a small object is given by X=34+10t+2t^3, where t is in seconds and x in meters.

what is the average velocity of the object between 0 and 3.0s? at what time between 0 and 3.0s is the instantaneous velocity zero?

2007-09-13 12:42:30 · 1 answers · asked by Mimi 1

A stone is launched straight up by a slingshot. Its initial speed is 19 m/s and the stone is 1.5 m above the ground when launched. (a) How high above the ground does the stone rise? (b) How much time elapses before the stone hits the ground?

2007-09-13 12:26:21 · 1 answers · asked by Anonymous

2007-09-13 12:11:55 · 3 answers · asked by Anonymous

A racket ball is struck in such a way that it leaves the racket with a speed of 4.87m/s in the horizontal direction. When the ball hits the court, it is a horizontal distance of 1.95m from the racket. Find the height of the racket ball when it left the racket. I'm not sure what equation to use for this.

2007-09-13 12:09:13 · 2 answers · asked by lorinkuuipo 1

A model rocket is launched straight upward with an initial speed of 70.0 m/s. It accelerates with a constant upward acceleration of 2.00 m/s2 until its engines stop at an altitude of 150 m. (a) What is the maximum height reached by the rocket?

2007-09-13 11:51:16 · 2 answers · asked by ags101 2

2007-09-13 11:48:33 · 2 answers · asked by Alexander 6

Why is it better to hold the hammer with the handle down rather than with the head down?

2007-09-13 11:27:50 · 9 answers · asked by Anonymous

and the two balls were dropped from height 10m on concrete floor. During entire fall tennis ball remained on top of rubber ball.

Ignoring air resistance and other losses of energy, to what altitude will the tennis ball bounce?

2007-09-13 11:23:59 · 1 answers · asked by Alexander 6

In a certain right triangle, the two sides that are perpendicular to each other are 4.30m and 7.40m. What is the length of the third side of the triangle?

2007-09-13 11:20:50 · 8 answers · asked by Anonymous

A mountain climber stands at the top o a 59.0 meter cliff hanging over a calm pool of water the climber throws two stones vertically 1.7 seconds apart and observes that they cause a single splash when they hit the water the first stone has an initial velocity of +2.3m/s.
what will be the velocity of the first stone be at the instant both stones hit the water? answer in m/s.

how long after the release of the first stone will the tow stones hit the water? answer in units of seconds.

What is the initial velocity of the second stone when it is thrown? answer in units of m/s

what will the velocity of the second stone be the instant both stones hit the water? answer im m/s

2007-09-13 11:12:41 · 1 answers · asked by contraseña 1

from the bottom of their building. They estimate the balcony is 50 m high and wonder how fast they would have to jump horizontally to succeed in reaching the pool. What is your answer?

2007-09-13 11:12:34 · 1 answers · asked by Anonymous

what is the physics behind a music composer? i have to write an essay about a music composer, but its for physics. and i just dont understand the relation between the two?

2007-09-13 10:44:48 · 1 answers · asked by Anonymous

A 5 gallon cylindrical tank contains orange juice.
http://i6.tinypic.com/6g1rqlh.gif
It took 15 seconds to fill the first 10 oz glass.
(ignore viscosity of the juice)

2007-09-13 10:21:21 · 2 answers · asked by Alexander 6

2007-09-13 09:29:06 · 79 answers · asked by Anonymous

2007-09-13 09:21:04 · 3 answers · asked by m_tricia 3

Three half-full water tanks are connected with pipes as shown here:
http://i7.tinypic.com/6gdvqdv.gif

The numbers on the right indicate elevations with respect to the floor (ignore viscosity and other losses)

2007-09-13 09:11:24 · 2 answers · asked by Alexander 6

Read this news article from yesterday (12th sept).

http://www.telegraph.co.uk/earth/main.jhtml?xml=/earth/2007/09/12/sciscroll112.xml

then read this:

http://en.wikipedia.org/wiki/Diamond_Light_Source

2007-09-13 08:49:08 · 2 answers · asked by steve h 3

Car A and B are traveling in adjacent highway lanes and at t=0 have the positions of car A vel =15km/h and Car B vel=23km/h. knowing that A has a constant accel of .6m/s^2 and B has a constant decel of -.4m/s^2 determine a. when and where A will overtake B. b. the speed of each at that time

2007-09-13 08:36:15 · 1 answers · asked by Riaz J 1

if you could go back in time and go forward into the future, where would you go and what would you do?

2007-09-13 07:24:49 · 10 answers · asked by Anonymous

Lets take a natural magnet.
Certainly we can produce some movement wth it. If we manage the magnetic fields, we can eventually make some use of it. In other words, we will be using the magnet as a source of energy. Like a long life battery.
A small magnet will not have much force, but regarding its life time, the energy released in a long term can be pretty good.
Is there any mechanical device using this force?
How long the magnetic field will be good enough before needing replacement?
Is there any way improove the strength (like taking out that energy faster)
Sorry if this sounds like a stupid question for the experts, but magnets are something that seems to me like totally different from traditional sources.

2007-09-13 07:20:00 · 7 answers · asked by Don't worry... be happy 3

2007-09-13 07:17:25 · 3 answers · asked by Anonymous

Can you tell me what type of quantity the time is?
scalar or vectorial ,please explain ...

2007-09-13 06:59:21 · 5 answers · asked by Anonymous