Physics - October 2007

Not sure how the two equations equal each other...

2007-10-17 13:27:22 · 4 answers · asked by hmmmm 1

The Jetscream amusement park ride at wonderland is shown here: http://www.pcwjunkies.com/pcw/flatrides/jetscr.htm

It starts off by swinging like a simple pendulum until its amplitude becomes so great that it swings completely around. If the diameter of the circle is 30.0m, what speed must the ship have at the very bottom to just make it to the highest point and sit there with no residual speed?

(use Energy formula- E_k = 1/2mv^2 & E_g=mgh)
..

2007-10-17 13:26:51 · 3 answers · asked by S D 2

FInd the tension in all the strings.
I already know tension in C is 250 N
60 and 45 are the angles formed

http://tinypic.com/fullsize.php?pic=3463yx5&s=2

2007-10-17 13:21:51 · 1 answers · asked by Anonymous

2007-10-17 13:01:03 · 1 answers · asked by Caesar 3

This is a question from my Gr 12 Physics textbook...and i don't understand it.

A Small box is resting on a larger box sitting on a horizontal surface. When a horizontal force is applied to the larger box, both boxes accelerate together. The small box does not slip on the larger box.
a) Draw a FBD of the small box during its acceleration.

If you can please explain all the forces that are acting on the box. I know there is the force of Gravity and the Normal force. There is supposed to be other forces but im not sure what they are, what direction they are goin in and why they exist. If anyone can explainit, thatd be awesome.

2007-10-17 12:47:33 · 1 answers · asked by hempplant2004 1

A 0.40 kg ball on a string is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the tension is 16 N. What are the tensions in the string when the ball is at the twelve o'clock and at the six o'clock positions.

2007-10-17 12:36:47 · 3 answers · asked by Singh J 1

The human being is both an individual and all of humanity (ie; shared gene pool, shared environment, shared energy) in the same way that light is both particle and a wave? Please help me to further my understanding.

2007-10-17 12:31:12 · 5 answers · asked by CSkyways 2

2007-10-17 12:25:54 · 3 answers · asked by bella 1

Grade 11 physics.

2007-10-17 12:16:44 · 3 answers · asked by Anonymous

I had a quiz today and I didn't went to school for like a week and I had to answer these two problems, but I really didn't know what to do.I would like someone to explain it to me step by step how to solve it plzzz.

1)A vector drawn 6cm long represent a force of 23N.
what force does a vector that is 13cm long,drawn to the same scale, represent? answer in units of N.

2)A vector drawn 6cm long represents a force of 64N.
How long would you draw a vector for a force of 124N? Answer in units of cm.

2007-10-17 12:14:10 · 1 answers · asked by Anonymous

Why is a ball shot from a spring gun at 45 degrees yield greater distance then one at 30 or 60 degrees?

2007-10-17 12:05:21 · 3 answers · asked by Anonymous

2007-10-17 12:02:44 · 6 answers · asked by pinoy_92 1

Using newton's 1st law of motion in your answer, explain whay a baby is better off riding in a car when it is special car seat that faces backward rather than forewards.

2007-10-17 11:35:45 · 5 answers · asked by Sarah 1

A 100 gram cue ball traveling at 500 cm/s hits a rack of 15 billiard balls of equal mass. The cue ball is stopped in the collision. Assume all 15 billiard balls move away at the same speed.

A. What is the total momentum before and after the collision?
B. What is the speed of each ball after the collision?

Any help appreciated, I have no clue how to approach this!

2007-10-17 11:18:40 · 2 answers · asked by victoria r 1

bounce height means the height that the ball bounces when it is dropped. i know that density does affect it but how would you put it in scientific terms?

2007-10-17 11:13:59 · 3 answers · asked by serendipity 2

I f we have a circuit and flip the resistor so that the terminals are connected in the reverse way, does it change the voltage in any element of the circuit (with other resistors and a battery in series. One of the wires is connected to ground)? What if I flip the battery terminals? Thanks

2007-10-17 10:59:58 · 4 answers · asked by simba 2

A small metal ball is suspended from the ceil-
ing by a thread of negligible mass. The ball
is then set in motion in a horizontal circle so
that the thread describes a cone.
The acceleration of gravity is 9.8 m/s2.
What is the speed of the ball when it is in
circular motion? Answer in units of m/s.
How long does it take Tperiod for the ball to
rotate once around the axis? Answer in units
of s.

2007-10-17 10:52:25 · 1 answers · asked by PhysicsDumbass 1

A block is placed on a inclined plane.
The acceleration of gravity is 9.8 m/s2 The acceleration of gravity is 9.8 m/s2.
A 25 N force is required to push the block
up the incline with constant velocity.
What is the weight of the block? Answer in
units of N.

2007-10-17 10:47:49 · 3 answers · asked by PhysicsDumbass 1

The planet Mars has a mass of 6.1 * 10^23 kg and radius of 3.2 * 10^6 m. What is the acceleration of an object in free fall near the surface of Mars? The value of the gravitational constant is 6.67259 * 10^-11 N*m^2/kg^2. Answer in units of m/s^2.

2007-10-17 10:43:08 · 2 answers · asked by josh j 1

36 degrees in celcius ( c) how much would it be in farhienhiet (f) please answer this question!!!

2007-10-17 10:40:25 · 3 answers · asked by Anonymous

A 6.6 kg mass on a frictionless inclined sur-
face is connected to a 2.4 kg mass. The pulley
is massless and frictionless, and the connect-
ing string is massless and does not stretch.
The 2.4 kg mass is acted upon by an upward
force of 5.6 N, and thus has a downward ac-
celeration of only 4.5 m/s2 .
The acceleration of gravity is 9.8 m/s2 .
What is the tension in the connecting
string? Answer in units of N.

2007-10-17 10:38:50 · 2 answers · asked by PhysicsDumbass 1

60kg crate rests on level floor. coefficients of static and kinetic friction are .760 and .410 respectively. What horizontal pushing force is required to (a) just start the crate moving (b) slide the crate across the dock at a constant speed?

For this one I got (a) = 429 N and (b)=226N
?

Is a net force being applied to an object when the object is moving downward
(a) with a constant acceleration of 9.8m/s^2
(b) with a constant velocity of 9.8 m/s^2?
Reasoning?

Stack of books 165Newtons are placed on a scale in an elevator. scalre reads 165N. can u tell from this info whether the elevator is moving with constant velocity of 2m/s upward or 2m/s downward or whether the elevator is at rest? explain

2007-10-17 10:36:10 · 1 answers · asked by Anonymous

when concorde used to fly from london to new york it arrived (US time) slightly before it left (UK time), so if you kept heading westward at that speed, wouldn't you be going backward in time, especially when you fly over the international dateline and go back a day? assuming the fuel supply is limitless of course.......

2007-10-17 10:36:07 · 10 answers · asked by tina k 3

2007-10-17 10:35:20 · 2 answers · asked by bristo75 1

2007-10-17 10:31:17 · 6 answers · asked by *:+:♥PebbleZ♥:+:* 2

2007-10-17 10:27:04 · 4 answers · asked by *:+:♥PebbleZ♥:+:* 2

An inventive child named Chris wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley, Chris pulls on the loose end of the rope with such a force that the spring scale reads 327.5 N. Chris's true weight is 465 N, and the chair weighs 173 N. The acceleration of gravity is g=9.8 m/s^2. Find the magnitude of the acceleration of the system. Answer in units of m/s^2.

Had to miss like 5 of my physics classes, have no idea whats going on or how to do any of the problems on my worksheet, any help would be greatly appreciated. Thanks.

2007-10-17 10:25:24 · 1 answers · asked by PhysicsDumbass 1

2007-10-17 10:02:13 · 5 answers · asked by Ray K 1

Question 2:
A lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray itself is 0.260 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.00 kg plate of food and a 0.305 kg cup of coffee. Obtain the force T exerted by the thumb and the force F exerted by the four fingers. Both forces act perpendicular to the tray, which is being held parallel to the ground. The length of the tray is .4m. The cup is .38m from the end. Plate is .24m from end. Fingers are .1m from the end and the thumb is .06m from the end. The force of the thumb is down and the force of the fingers is up

2007-10-17 09:59:48 · 1 answers · asked by chicagolakers 2

Two ice skaters, Daniel (mass 69.9 kg) and Rebecca (mass 49.6 kg) are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 13.4 m/s before she collides with him. After the collision, Rebecca has a velocity of magnitude 7.1 m/s at an angle of 52.1° from her initial direction. Both skaters move on the frictionless, horizontal surface of the rink.

(a) What are the magnitude and direction of Daniel's velocity after the collision?

(b) angle° (clockwise from Rebecaa's original direction of motion)

(c) What is the change in total kinetic energy of the two skaters as a result of the collision?

2007-10-17 09:54:33 · 1 answers · asked by HighVoltage 1