Physics - October 2006

I need help with this problem.
What formula would you use?

2006-10-18 13:26:04 · 1 answers · asked by swimmertommy 1

2006-10-18 13:13:20 · 9 answers · asked by puffin4me41589 2

A 5.7 kg bag of groceries is in equilibrium on an incline of angle = 18°. Find the magnitude of the normal force on the bag.

____ N

i found the components already and i don't know what to do next.

2006-10-18 13:05:43 · 5 answers · asked by tingerpoo 2

2006-10-18 13:03:53 · 6 answers · asked by Anonymous

I need help with this problem.
What formula would you use?

2006-10-18 12:57:31 · 5 answers · asked by swimmertommy 1

Is that just another way of saying final velocity?

2006-10-18 12:56:56 · 3 answers · asked by bep 2

I need help with this problem.
What formula would you use?

2006-10-18 12:55:54 · 1 answers · asked by swimmertommy 1

A block of mass m is pushed against a spring that has a spring constant k. The spring is compressed by a distance d, and then the block is released. We observe that the block is launched by the spring along a horizontal frictionless surface with a final speed v.

If a second block, this one having a mass of 4m, is pushed against the spring and released, we observe that it gains a final speed of 2v. By what distance was the spring compressed in this second case?

2d
25d
16d
d
4d

(basically which factor does it go up by)... if someone could explain this to me as opposed to just giving me the answer it would be greatly appreciated.. thanks again

2006-10-18 12:20:43 · 3 answers · asked by stylesofbeyond40 1

A centrifuge has a rotational inertia of 6.66 X10^ -3 kg·m^2. How much energy must be supplied to bring it from rest to 458 rad/s?

2006-10-18 12:19:52 · 1 answers · asked by nt 2

ok, in a storm, lightning is often seen a considerable time b4 the thunder is heard:
1) if the lightning is seen 8 sec b4 the thunder is heard, calculate the distance of the thunder cloud from the observer.
2) what assumption have you made in your calculation? arigatou

2006-10-18 12:09:02 · 1 answers · asked by audaciously_shy 2

what units of measurement are used? THANK YOU!!!!!! sorry im not a phisical science person :p

2006-10-18 12:00:29 · 3 answers · asked by :) 2

using d=1/2AT^2

2006-10-18 11:36:11 · 3 answers · asked by jamarino92 1

2006-10-18 11:31:37 · 2 answers · asked by goring 6

I know a transistor can amplify a signal or open/close a circuit. But what I want to know in straight-forward terms is: What exactly is a transistor? And simply put, how does it work?

2006-10-18 11:30:04 · 7 answers · asked by jaybear 2

2006-10-18 11:14:04 · 6 answers · asked by Anonymous

2006-10-18 11:11:50 · 3 answers · asked by goring 6

A man stands on the roof of a building of height 16.6 m and throws a rock with a velocity of magnitude 31.1 m/s at an angle of 27.3' above the horizontal. You can ignore air resistance.
*The maximum height above the roof reached by the rock: 10.4 m
*Take free fall acceleration to be 9.80 m/s^2

A) Calculate the magnitude of the velocity of the rock just before it strikes the ground.

B) Calculate the horizontal distance from the base of the building to the point where the rock strikes the ground.



**please show how you got your answer!! THNX!!!**

2006-10-18 11:11:25 · 1 answers · asked by Dana 1

Sprinting near the end of a race, a runner with a mass of 65 kg accelerates from a speed of 6 m/s to a speed of 7 m/s in 2 s.

(a) What is the runner's average acceleration during this time?
m/s2

(b) To gain speed the runner produces a backward force on the ground, so that the ground pushes the runner forward providing the force necessary for acceleration. Calculate this average force.
N

The air exerts a forward force of 10 N on the propeller of a 0.40 kg model airplane. If the plane accelerates forward at 4.0 m/s2, what is the magnitude of the resistive force exerted by the air on the airplane?
N


A boat moves through the water with two forces acting on it. One is a 1500 N forward push by the motor, and the other is an 1100 N resistive force due to the water.

(a) What is the acceleration of the 900 kg boat?
m/s 2

(b) If it starts from rest, how far will it move in 6.0 s?
m

(c) What will its velocity be at the end of this time?
m/s

2006-10-18 10:48:01 · 2 answers · asked by ckielblock18 1

Where did he get that from and why is it considered today in cosmology?

2006-10-18 10:46:57 · 5 answers · asked by goring 6

IN OTHER WORDS, CAN A SOLID SUPERIMPOSE ON ANOTHER SOLID AS WAVES(ENERGIES) DO,IF IT IS GIVEN THAT ENERGY AND MATTER ARE DIFFERENT ASPECTS OF THE SAME PHYSICAL QUANTITY AND HENCE ARE INTERCONVERTIBLE.

2006-10-18 10:40:06 · 5 answers · asked by Hemant 2

if as you get closer to the speed of light time begins to slow then wouldnt light its self constantly be traveling thru time wouldnt you be able to see the light even after you turned it off or see it a few sec b4 it was turned on just a thought any comments

2006-10-18 10:25:53 · 18 answers · asked by llamasrocknroll 2

CONSIDER MINE ARE VERY AWFUL

2006-10-18 10:22:16 · 7 answers · asked by Made in Italy 4

I read somewhere that Einstein's theory of relativity proves that all space, time and matter came into existence at the Big Bang, and that when the Big Bang happened, it happened in a singularity where the laws of physics did not apply.

Could I get a non-technical but still scientific explanation of how relativity proves space, time, and matter came into existence at the Big Bang? and I don't want to hear about "imaginary time," thanks

2006-10-18 09:52:25 · 6 answers · asked by ? 4

On earth, two parts of a space probe weigh 14000 N and 5100 N. These parts are separated by a center-to-center distance of 13 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far from any other objects.

2006-10-18 09:39:19 · 6 answers · asked by dreamer36 1

2006-10-18 09:23:34 · 1 answers · asked by Anonymous

2006-10-18 09:13:03 · 8 answers · asked by Anonymous

A penny is placed on a rotating turntable. Where on the platter does the penny require the largest frictional force to remain in place?
a) equal force is required on all places on the platter
b) the center of the turntable
c) halfway between the center and the edge of the turntable
d) the edge of the turntable

2006-10-18 09:07:02 · 9 answers · asked by Jim E 1

2006-10-18 08:56:19 · 4 answers · asked by Jack P 1

2006-10-18 08:49:41 · 19 answers · asked by Anonymous

There is a wedge with mass m2 with angle theta, and another mass m1 on the slope of the wedge. There is a force F being exerted on the wedge from the flat side. Find an expression for the magnitude of the horizontal force F in the figure for which m1 does not slip either up or down along the wedge. All surfaces are frictionless.

2006-10-18 08:34:21 · 2 answers · asked by Bryan C 2