Physics - November 2007

A box is pulled at an angle of 37 degrees about the horizontal with a force of 50 N. The mass of the box is 40 kg and the coefficient of friction is 0.4. Calculate the quanties for the blanks below.

weight ________
F(subscript x) ___________
Normal force (W - Fsubcript y) _________
F (force of friction) __________
F(subscript net) ___________
Acceleration ___________

Please show/explain all work clearly please!

2007-11-27 10:33:28 · 1 answers · asked by nirmal 1

LIGO and LISA are set up to detect gravitons as if they were very sparse. If all masses are interacting via gravitons, shouldn't there be a lot of them?

Maybe what I'm asking is: is this just a matter of weeding them out among the effects of other things (which would explain why LISA is waiting for a massive event)? or are they actually that spread out (then why?)?

2007-11-27 10:32:15 · 5 answers · asked by iMi 4

2007-11-27 10:28:20 · 9 answers · asked by Dean W 1

Hi ok so I have a question. The earth pulls down on you. The floor pushes up on you, so you don't move. Explain why these two forces are NOT an action-reaction pair of forces. THANK YOU, 10 PTS.

2007-11-27 10:27:03 · 6 answers · asked by Jazzy 1

It takes 1200J of work to lift the car high enough to change a tire. How much work must be done by the person operating the jack if the jack is 25 percent effecient?

A windmill has an effeciency of 37.5 percent. If a gust of wind does 125J of work on the blades of the windmill, how much output work can the windmill do as a result of the gust?

Please WORK OUT THANKYUO

2007-11-27 10:23:21 · 1 answers · asked by abdo94 1

We did a height function problem today which stated that a batter hit a baseball ball directly upward at an initial velocity of 96 ft/sec. We were to find the usual total time in air, max height, etc...all of which we did...

But one of my students vehemently argued that the "hit directly upward" was not even possible. Can anyone help clarify the reasonableness of this word problem?

2007-11-27 10:18:52 · 6 answers · asked by Anonymous

2007-11-27 10:12:16 · 3 answers · asked by Bader A 1

MIT, Princeton....any others with great physics programs? Thanks!

2007-11-27 10:05:56 · 1 answers · asked by pianotime 3

What is the wavelength of a photon needed to excite an electron from (-15 x 10^-19) to (-1.0 x 10^-19)?
I know the first step is to do (-1.0 x 10^-19) - (-15 x 10^-19)
which equals (1.4 x 10^-18).

2007-11-27 09:41:36 · 2 answers · asked by RK 2

Divers in Acapulco dive from a cliff that is 61 m high. If the rocks below extend outward for 23m what is the minimum horizontal velocity a diver must have to clear the rocks??

do you break into compents?? like
23cos(90)=0
23sin(90)=23
plz help my teacher is horrible!!

2007-11-27 09:38:07 · 3 answers · asked by softballviolinist14 3

If given the trajectory equation as y=x*tan# - (g*x^2)/(2V^2*(cos#)^2)

where
y is the path of the trajectory
x is the horizontal distance
# is the angle it is launched at
g is gravity
V is launch velocity

how do you, using derivatives, find the equation to calculate the maximum height of an object being launch so that you can plug in velocity, gravity, and horizontal distance and equal the angle it should be launched at to reach maximum height

2007-11-27 09:23:06 · 2 answers · asked by chibiams 1

At the instant that it passes its initial position on its way down, a heavier marble is thrown verticaly downward from the same initial speed. which marble reach the ground first (neglect air friction)? why?

2007-11-27 09:17:26 · 5 answers · asked by Anonymous

I am trying to connect everything. so in the electromagnetic spectrum, i know that infrared and visible lights are thermal radiation. It also says that anything above absolute zero temperature emit thermal radiation. So does that mean other radiations in the electromagnetic spectrum are duet to thermal radiations??

2007-11-27 09:15:28 · 3 answers · asked by chika 1

Suppose David puts a 0.40 kg rock into a sling of length 1.5 m and begins whirling the rock in a nearly horizontal circle above his head, accelerating it from rest to a rate of 110 rpm after 5.0 s. What is the torque required to achieve this feat?
__________ N·m

2007-11-27 09:14:13 · 1 answers · asked by hayleym425 2

2007-11-27 09:09:59 · 6 answers · asked by ddrfreak25 1

clark gable is standing inside a stationary bus in front of claudette, who is seating, the bus suddenly starts moving forward and clark falls into claudette lap. explain why this happens

2007-11-27 09:03:40 · 3 answers · asked by peipei91189 1

Magnet A has twice the magnetic field strength of Magnet B (at equal distance) and, at a certain distance, it pulls on Magnet B with a force of 50 N. With how much force, then, does Magnet B pull on Magnet A?

2007-11-27 08:55:08 · 2 answers · asked by pinay804 2

If Shiro must sit 0.8m from the center to balance Logan, what is Shiro's mass?

2007-11-27 08:39:06 · 1 answers · asked by Anonymous

A 1.6 m long ladder leans against a frictionless wall. The coefficient of static friction between the ladder and the floor is 0.30. What is the minimum angle the ladder can make with the floor without slipping? Where do I start and how do I do this without knowing the mass?

2007-11-27 08:10:25 · 1 answers · asked by Anonymous 4

For a simple pendulum, what is the distinction between the angular velocity and the angular frequency? Which is constant and which is variable?

2007-11-27 07:39:04 · 2 answers · asked by You Know Who 2

Alright well I have a lab due tomorrow, and there's one question I need help with. We rolled a ball bearing off a table and we need to answer some stuff about it. Alright I'll give you the data first. The velocity is .813 m/s. The table is 1m high. The ball landed 35.66cm's away from the table. I need to calculate the time it took the ball to fall from the edge of the table to the ground. Normally I don't post homework problems on Yahoo Answers, but I'm really having trouble with it. Thanks for the help!

2007-11-27 07:16:29 · 1 answers · asked by Anonymous

2007-11-27 07:13:03 · 1 answers · asked by Ryan G 2

One end of a uniform meter stick is placed against a vertical wall . The other end is held by a lightweight cord that makes an angle with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.400.

a. What is the maximum value the angle can have if the stick is to remain in equilibrium?
b. Let the angle between the cord and the stick is = 16.0. A block of the same weight as the meter stick is suspended from the stick, as shown, at a distance from the wall. What is the minimum value of for which the stick will remain in equilibrium?
c. When = 16.0, how large must the coefficient of static friction be so that the block can be attached 15.0 from the left end of the stick without causing it to slip?

2007-11-27 07:09:44 · 1 answers · asked by Anonymous

A 1.50x10^3 kg car can go from 0.0km/h to 120.0 km/h in 5.8 seconds. If the average air resistance is 3.00x10^2 N, how much power does the engine have?

2007-11-27 06:50:45 · 1 answers · asked by Glenn K 1

Consider a test particle of mass m that is free to move in a 2-dimensional plane. A time-dependent force pulls the particle towards the origin. The magnitude of the force is F*t. What are the equations of motion for the test particle?

2007-11-27 06:49:53 · 2 answers · asked by Anonymous

Please help =]

2007-11-27 06:21:50 · 4 answers · asked by Anonymous

I was just ddoing my homework and I don't really understand the question asked let alone answer it. The question is:
"Why is the best shape of the spacecraft for heat energy manegment a sphere?"
Can anyone tell me what it's asking?
Thanks

2007-11-27 06:08:54 · 3 answers · asked by Anonymous

An atomic clock moves at 1400 km/h for 1.50 h as measured by an identical clock on the earth. HOw many nanoseconds slow will the moving clock be compared with the earth clock, at the end of the 1.50 h interval?

help please

2007-11-27 05:59:59 · 1 answers · asked by Anonymous

This is a naturally occurring phenomena. Can you explain it?

For an example, see http://s226.photobucket.com/albums/dd11/jackphotos123/?action=view¤t=moon.jpg and ignore the photoshopped moon in the picture.

2007-11-27 05:38:32 · 3 answers · asked by Frst Grade Rocks! Ω 7

and how it works

2007-11-27 05:13:15 · 2 answers · asked by ZAKES 1