Physics - February 2007

1) The winner of the shot-put event in the Olympics is the person who best uses___________.

a. Newton's first law
b. Newton's second law
c. air resistance
d. the law of gravity

2) State each of Newton's three laws of motion in your own words, and give an example that demonstrates each law.

2007-02-05 12:59:54 · 1 answers · asked by J 6

Large trees? conduction
turbines? convection
windows? convection
white paint? radiation
drapes-convection
tint?-radiation
boxing (house)- radiation

2007-02-05 12:56:53 · 2 answers · asked by ghettoco 1

a. inertia
b. weight
c. speed
d. gravity

2007-02-05 12:47:22 · 3 answers · asked by J 6

On a distant planet, golf is just as popular as it is on earth. A golfer tees off and drives the ball 3.5 times as far as he would have on earth, given the same velocities on both planets. The ball is launched at a speed of 56 m/s at an angle of 38° above the horizontal. When the ball lands, it is at the same level as the tee.

(a) On the distant planet, what is the maximum height of the ball?

(b) On the distant planet, what is the range of the ball?

2007-02-05 12:41:29 · 2 answers · asked by Anonymous

2007-02-05 12:34:27 · 3 answers · asked by RhondaJo 2

1. If you jog for 1 hour and travel 10 km, 10 km/h describes your________.

a. momentum
b. average speed
c. displacement
d. acceleration

2. ________ is speed in a certain direction.

a. acceleration
b.friction
c. momentum
d. velocity

3. Which of the following objects is not accelerating?

a. a ball being juggled
b.a woman walking at 2.5 m/s along a straight road
c.a satellite circling Earth
d. a braking cyclist

4. Automobile seat belts are necessary for safety because of a passenger's ___________.

a. Newton's first law
b. Newton's second law
c. air resistance
d. the law of gravity

2007-02-05 12:33:44 · 9 answers · asked by J 6

2007-02-05 12:25:09 · 5 answers · asked by Kiwi 1

2007-02-05 12:04:58 · 1 answers · asked by mimi j 1

I'm doing a powerpoint, and be detailed with examples of how related.

2007-02-05 11:57:42 · 2 answers · asked by webprincess02 1

help!

2007-02-05 11:54:57 · 3 answers · asked by ocqueen92 2

assuming no air resistance, how long does it take a penny to fall if it was dropped from the CN Tower (553 m)? accerleration due to gravity is 9.;8 m/s^2...

what i got...Givn: t=? d=553 m a=9.8m/s^2 v1=0
the equation should be...d=v1t+1/2at^2 rite?...and all i have to do is to move t by it self?...thats where i get stuck...

2007-02-05 11:43:22 · 1 answers · asked by no name 1

2007-02-05 11:16:58 · 14 answers · asked by MoreFoolPhil 2

A 600g sample of water at 90 Celsius is mixed with 400g of water at 22 Celsius. Assume no heat loss to the surroundings. What is the final temp of the mixture?

2007-02-05 11:16:38 · 1 answers · asked by Anonymous

2007-02-05 11:06:37 · 9 answers · asked by amyr1996 2

A 6.0*10^2-g sample of of water at 90.0º Celsius is mixed with 4.00*10^2-g of water at 22.0º Celsius. Assume that there is no heat loss to the surroundings. What is the final temperature of the mixture?

This problem is giving me trouble.
Please help me.

2007-02-05 10:54:16 · 2 answers · asked by swimmertommy 1

2007-02-05 10:54:04 · 4 answers · asked by Annie 5

2007-02-05 10:48:37 · 4 answers · asked by abuamin55 2

A 2.50*10^2-kg cast-iron car engine contains water as a coolant. Suppose that the engine's temperature is 35.0º Celsius when it is shut off, and the air temperature is 10.0º Celsius. The heat given off by the engine and water in it as they cool to air temperature is 4.40*10^6 Joules. What mass of water is used to cool the engine?

Please help me with this problem.
I can't understand this.

2007-02-05 10:44:15 · 2 answers · asked by swimmertommy 1

What difference is there in the different types of audio file formats (mp3, aiff, wav, etc.) as well as khz, bits, etc.? What would be the applications for these differences? Are there minimum requirements for "broadcast", etc.?

2007-02-05 10:41:33 · 2 answers · asked by DaveLandon 1

Since space is a vacuum and light is a wave (as well as a particle) how can light "waves" travel through a void if there is no mass to prppagate the wave?

2007-02-05 10:33:14 · 9 answers · asked by barefoot_always 5

A block of wood with a mass of 2.32 kg sits on the edge of a table that is 1.43 m tall. A bullet with a mass of 53.4 g traveling with a speed of 390 m/s is shot into the block and is lodged in it. Assuming that no energy is lost to friction, how far from the table will the block land?

2007-02-05 10:24:14 · 1 answers · asked by Anonymous

The escalator that leads down into a subway station has a length of 30.0m and a speed of 1.8 m/s relative to the ground. A student is coning out of the station and running up it in the wrong direction. The local record time for this stunt is 11s. Relative to the escalator what speed must the student exceed in order to beat the record?

Please show work. thanks so much!

2007-02-05 10:14:06 · 4 answers · asked by poker22only 2

1)conduction
2)convection
3)radiation
4)compression
thank you!

2007-02-05 10:13:23 · 2 answers · asked by Anonymous

you watch a distant farmer driving a stake into the ground with a sledgehammer.he hits the stake at a regular rate of one stroke per sec.you hear the sound of the blows exactly synchronized with the blows you see.and then you hear one more blow after you see him stopo hammering.how far away is the farmer?explain

2007-02-05 10:06:26 · 1 answers · asked by kobay 2

alternative energy source? seeing wicking water happens by itself with no outside help

2007-02-05 09:50:08 · 2 answers · asked by maikellysummit 2

for example, wick the water out of a huge lake with a big wick and get it to a resivour on a high place and then let it through a generator on the way down to produce a limitless supply of energy

2007-02-05 09:40:55 · 5 answers · asked by maikellysummit 2

An adventurous archaeologist crosses between two rock cliffs by slowly going hand-over-hand along a rope stretched between the cliffs. He stops to rest at the middle of the rope . The rope will break if the tension in it exceeds 2.10×10^4 N , and our hero's mass is 91.1 Kg.
1) If the angle between the rope and the horizontal is 10.6, find the tension in the rope.
Take the free fall acceleration to be = 9.80 m/ s^2
2430 N Correct
2) What is the smallest value the angle can have if the rope is not to break?

I found the answer to the first question, but for osme reason i can not get the answer tothe second one. I did some calculation and got it to be 4.8 but it says that is not the correct answer.

Any help will be appreciated

thanks

2007-02-05 09:37:45 · 1 answers · asked by Robert G 2

Where abouts would i be able to find some simple circuits that could be used to explain how each of these laws can be applied to a conventional electrical and electronic circuit

2007-02-05 09:30:45 · 1 answers · asked by MoLeY 1

A human being can survive a feet-first impact at speeds up to roughly 12 m/s (i.e., 27 mi/h) on concrete; 15 m/s (i.e., 34 mi/h) on soil; and 34 m/s (i.e., 75 mi/h) on water. Explain the spread in these values.

2007-02-05 09:30:39 · 0 answers · asked by Anonymous

The glider on an air track has a mass of 1.00 kg and floats on compressed air, so it can move frictionlessly. Someone shoots a 15.0 g lump of clay at it. The clay strikes the glider, sticks to it, and both move away with a speed of 22.0 cm/s. What was the speed of the clay as it hit the glider?

_____ m/s

2007-02-05 09:25:25 · 1 answers · asked by Anonymous