Physics - November 2007

A 1500.0 N force is exerted on a 200.0 kg crate to move it across the floor. If the coefficient of friction is 0.250, what is the crate's acceleration?

I need some guidence in this one. Thanks...please!

2007-11-03 10:31:12 · 1 answers · asked by ☺♠JonasJay♫♦ 5

2007-11-03 10:25:07 · 9 answers · asked by dwadefranchizemia03 5

Jupiter's four large moons - Io, Europa, Ganymede, and Callisto - were discovered by Galileo in 1610. Jupiter also has dozens of smaller moons. Jupiter's rocky, and volcanically - active moon Io is about the size of Earth's moon. Io has a radius of about 1.82 x 10^6 m, and the mean distance between Io and Jupiter is 4.22 x 10^8m.

1) If Io's orbit were circular, how many days would it take for Io to complete one full revolution around Jupiter?

2007-11-03 10:04:30 · 3 answers · asked by Anonymous

A sled with a mass of 135kg is frozen to a 20 degree slope with M static (the coefficient of friction) of .4 How much additional force is required to start the sled moving down the hill?

2007-11-03 10:03:18 · 1 answers · asked by Anonymous

If you lose your grip on a rapidly spinning merry-go-round and fall off, in which direction would you fly? Explain.

2007-11-03 09:56:22 · 7 answers · asked by Anonymous

can the fastest runner in sports jump higher than 18 feet (world record) and maybe reaching 30 feet in pole vault with a long enough pole?? how high might he get?

2007-11-03 09:35:57 · 2 answers · asked by Heavy-Metal123 3

Robert is standing beside a parade, listening to the sound of a brass band. The speed of the sound in air is 330 metres/second. The band marches past Robert and off into the distance at a speed of 2.0 metres/second. The tuba is playing a note with a frequency of 96Hz. What frequency does Robert hear?

And please, refrain from being rude or vague. I don't even need the answer -- I'd much prefer someone explain this to me. In all other similar problems, they used the term "1000 compressions". How do I know how many compressions are made in this problem? Try not telling me how "simple" or "elementary" this problem is -- just answer the damn question. If you don't know what you're talking about, please just move along. For anyone wondering why this is in the Singles and Dating section, it's because this is (sadly) one of the more popular boards on Y!Answers.

Thank you!!!

2007-11-03 09:28:37 · 1 answers · asked by Anonymous

2007-11-03 09:21:31 · 4 answers · asked by chris p 1

1. A baseball is thrown at an angles of 22degrees relative to the ground at a speed of 27.1m/s. The ball is caught 52.0 m from the thrower.
a) How long is it in the air?(I had the correct answer on this one which was 2.0695131 seconds)
b) How high is the tallest spot in the balls path?(I used the whole time it was up and then divided it in half to get 5.42820082m which was wrong)

2. A quarterback throws the football to a stationary receiver who is 26.7m down the field. The football is thrown at an initial angle of 36.5degrees to the ground.
a) At what initial speed must the quarterback throw the ball for it to reach the receiver?
b) What is the ball's highest point during its flight?
I had both wrong, but i dont see how i missed a when i used the same equations as above, but my answers were 18.2274788 and 13.2032173 respectively.

2007-11-03 09:01:16 · 1 answers · asked by Anonymous

How many seconds will elapse between seeing lightning and hearing the thunder if the lightning strikes 1 mile away and the air temperature is 20degrees Celsius?

2007-11-03 08:41:12 · 4 answers · asked by RoRoStar 1

A camel sets out to cross the desert, which is 23.9 km wide in the north-south direction. The camel walks at the uniform speed 4.26 km/hr along a straight line in the direction 35.5 ° north of East.
A) How long will it take the camel to cross the desert? Answer in units of hr.
B) Calculate the camel's eastward displacement while he crosses the desert. Answer in units of km.

Please show work.
Thanks for the help!

2007-11-03 08:41:05 · 1 answers · asked by jon s 2

Light with wavelength 422 nm passes through a double-slit system that has a slit separation d = 0.400mm.Deter-mine how far away a screen must be placed so that dark fringes appear directly opposite both slits,with only one bright fringe between them.

2007-11-03 08:29:26 · 1 answers · asked by Anonymous

I'm building an egg catapult (well, giant slingshot, actually) and given the egg's drag coefficient, mass, launching angle, and initial velocity I'd like to be able to predict the range. More specifically, I'd like to be able to target specific ranges by adjusting the initial velocity. Been too long since I've had physics, so i need some help on this one! I know how to do it ignoring drag, but that is not an appropriate assumption in this case.....

Thanks!

2007-11-03 08:23:13 · 1 answers · asked by Matt 1

A space station shaped like a giant wheel has a radius 105 m and a moment of inertia of 5.05 x108 kgm2. A crew of 150 are living on the rim, and the station's rotation causes the crew to experience an acceleration of 1 g (Fig. P11.40). When 100 people move to the center of the station for a union meeting, the angular speed changes. What acceleration is experienced by the managers remaining at the rim? Assume that the average mass of each inhabitant is 65.0 kg.

Comet Halley moves about the Sun in an elliptical orbit, with its cloest approach to the Sun being about 0.580 AU and its greatest distance from the sun being about 35.0 AU (1 AU = the average Earth-Sun distance). If the comet's speed at its closest approach is 54.0 km/s, what is its speed when it is farthest from the Sun?
The angular momentum of the comet about the Sun is conserved b/c no torque acts on the comet. The gravitational force exerted by the sun on the comet has a moment arm of ____.

2007-11-03 08:03:39 · 2 answers · asked by ひいらぎ 5

2007-11-03 08:02:39 · 5 answers · asked by Anonymous

how many molecules are in18 g of each of the following substances?
1-CO
2-N2
3-P4
4-P2
Do parts and contain the same number of atoms of phosphorous?


***There are 20 drops in 1 ml of water which weights one gram suppose one drop of water evaporates in one hour how many water molecules evaporate per second?

2007-11-03 07:57:37 · 1 answers · asked by mohamed r 1

Ok these 2 i had the most difficult with.

1- Suppose you have to hold a box of mass 10 kg against a wall so that the box does not slip. The coefficient of friction between the wall and the box is 0.70. What must be the minimal force you have to apply?

2- 3 masses m1 = 10 kg, m2 = 15 kg and m3 = 20 kg, are pulled with a force of 166N across a table. A coefficient of friction between the table and boxes is 0.12.
(theres suppose to be a pic but i couldnt get it on here)

a- Calculate the acceleration of the masses
b- Calculate the tension of T2
c- Calculate the tension T3

2007-11-03 07:48:08 · 1 answers · asked by Michael 1

2007-11-03 07:36:33 · 4 answers · asked by Anonymous

i have to do a simple project on electric circuit.can you explain the working of the above things.if that's tough can u suggest any load for a electric circuit.

2007-11-03 07:10:31 · 1 answers · asked by shahzadiarif 1

In Fig. 13-41, a particle of mass m1 = 0.56 kg is a distance d = 30 cm from one end of a uniform rod with length L = 5.5 m and mass M = 2.4 kg. What is the magnitude of the gravitational force on the particle from the rod?

http://i95.photobucket.com/albums/l156/pontellierlover/fig13_41.gif

2007-11-03 06:51:04 · 1 answers · asked by Anonymous

Certain neutron stars (extremely dense stars) are believed to be rotating at about 0.77 rev/s. If such a star has a radius of 10 km, what must be its minimum mass so that material on its surface remains in place during the rapid rotation?

2007-11-03 06:45:03 · 1 answers · asked by Anonymous

a magnifying glas uses a converging lens with a focal length of 14.5 cm. it produces a virtual and upright image that is 3.1 times larger than the object, how far is the object from the lens?


what is the image distance?


dont i use the eqn 1/p+1/q=1/f?

i got the answer wrong what am i doing wrong?

explain in details..........

2007-11-03 06:33:08 · 1 answers · asked by Pac M 1

What is the maximum load that could be suspended from a copper wire of length 1.5 m and radius 1 mm without breaking the wire? Copper has an elastic limit of 2 × 10^8 Pa and a tensile strength of 4.1 × 10^8 Pa.

2007-11-03 05:52:20 · 2 answers · asked by Anonymous

Water entering a house flows with a speed of 0.22 m/s through a pipe of 2.1 cm inside diameter. What is the speed of the water at a point where the pipe tapers to a diameter of 4.5 mm?

2007-11-03 05:49:46 · 1 answers · asked by Anonymous

say your at point a, you set out to go to point b, in between you there is a vacuum. why does it take time to get to point b? if there is nothing between two points than there is nothing to cross, right? why does it take time and energy to pass through nothing?


a--------------------------b

2007-11-03 05:06:25 · 6 answers · asked by fleabis 2

Steam at 100'C is passed over 1000g of ice at 0'C.After sometime 600 g of ice at 0'C is left and 450g of water at 0'C is formed.Calculate the specific latent heat of vapourisation of steam.

Given: Specific latent heat of ice is 336J/g and specific heat capacity of water is 4.2 J/g/K

2007-11-03 04:48:18 · 2 answers · asked by Jewel 1

Why is mains electricity AC (Alternative current)?

2007-11-03 04:35:24 · 7 answers · asked by <3 4

If you went somewhere, would you get there fast enough to see yourself arrive?

2007-11-03 04:31:53 · 5 answers · asked by vote4pedro0529 1

In a photoelectric experiment, it is found that a stopping potential of 1.00 V is needed to stop all the electrons when incident light of wavelength 260 nm is used and 2.30 V is needed for light of wavelength 207 nm. From these data, determine Planck's constant and the work function of the metal.

2007-11-03 04:27:23 · 2 answers · asked by szydzo 1

What is the impedance?

2007-11-03 04:09:41 · 1 answers · asked by STUDY 3