Physics - October 2006

Imagine that I´m in space lab, moving arount earths orbit but I would like to have this space lab making spins / turns arount itself and get the earths gravity.

2006-10-15 10:36:42 · 4 answers · asked by Anonymous

2006-10-15 10:30:04 · 3 answers · asked by Eoin B 2

2006-10-15 10:29:18 · 2 answers · asked by Anonymous

If a ball of weight 9.54 N has a buoyant force of 0.69 N acting on it, what will the ball's actual acceleration (in m/s^2) be when the ball is dropped (ignoring air resistance)? Calculate your answer to the usual TWO DECIMAL PLACES. No, buoyant force isn't the same thing as air resistance! Your answer will be a negative number. HINT: A force diagram, and Newton's Second Law, will both be very helpful.

2006-10-15 10:21:44 · 2 answers · asked by Michael 4

How much does a helium balloon weigh? Assume that you have a spherical weather balloon of radius 1.49 m. Use the value 0.198 kg/m^3 for the density of helium, since the density of helium varies with temperature. Assume that the mass of the skin of the balloon is 0.774 kg. To TWO DECIMAL PLACES, what is the weight of the balloon in pounds? Please use the conversion factor 2.20 lb = 1 kg.

2006-10-15 10:21:14 · 2 answers · asked by Michael 4

An engine pulls a train of 20 freight car, each having a mass of 5.0 *10^4 kg with a constant force. The cars move from rest to a speed of 4.0 m/s in 20.0s on a straight track. Neglection friction, what is the force with which the 10 th car pulls the 11 th one?

2006-10-15 10:03:52 · 2 answers · asked by collegegirl 2

Suppose your display screen has 800 by 600 pixels. What is the total pixels on your screen?

2006-10-15 09:45:54 · 2 answers · asked by Meder 2

In my physics class, the professor said that (theoretically) if we could drill through the center of the Earth and drop a rock down the hole, the acceleration due to gravity would decrease linearly as the rock descended to the center. Then in my Geophysics class I learned about some theorem (forget what it was exaclty) that said you could treat the gravity of an object as if all the mass of the object were concentrated at its center. If the latter were the case, the rock would continue to accelerate at 9.8 m/s^2 all the way through it's fall to the center.

2006-10-15 09:45:45 · 9 answers · asked by wdmc 4

e.g. can 5 x 1000volt transistors connected in series switch 5000 volts?

2006-10-15 09:11:56 · 1 answers · asked by Anonymous

2006-10-15 09:08:29 · 6 answers · asked by STORMY K 3

is acted on by an applied force of 0.10 N for 20S.the force is directed horizontally in direction due east,calculate:
a)velocity of the object after applied force is removed.
b)the increase of K.E of the object.
c)the distance moved by the object eastwards.

2006-10-15 08:59:26 · 1 answers · asked by mohsen p 1

1. An object is dropped from a tower 80.0 m high. With what velocity does it strike earth?


2. A motorbike has an initial velocity of 3.0 m/s. If it is accelerated at the rate of 0.50 m/s^2 for 7.0 s, what is the final velocity?

3. A metal ball is thrown downward(meaning it has positive gravity) with a velocity of 20.0 m/s from a stationary hot-air balloon. If the altitude of the balloon is 500 m,
with what velocity does the ball hit the ground?

2006-10-15 08:19:03 · 4 answers · asked by dreamz 4

(b) Now two equal masses (labelled m1 and m2 for convenience of identification) have different
speeds. At t=0, equal constant forces are applied to the masses in a direction opposite to
the velocity of each mass. The distance travelled by each mass in coming to a stop under
the action of the force is measured. (The force is removed as soon as the object comes to
rest.) If the distance travelled by m1 is twice the distance travelled by m2, what is the
ratio of the initial speeds of the two masses, vo1/vo2?
(c) Still referring to the equal masses of part (b), what is the ratio of times taken for the
masses to stop (t1/t2) when the ratio of stopping distances is as given in part (b)?

2006-10-15 08:11:10 · 2 answers · asked by behshad c 1

Particles, would you please expain Light in terms of particles? Give examples?

Thank you.

2006-10-15 08:02:32 · 13 answers · asked by Anonymous

In terms of delta(change in)d and delta(change in)t, acceleration is expressed as....?...


In air, a dense object such as a lead shot falls (slower than, at the same speed as, faster than) .......?.......,an object of lower density, such as a dry tree leaf.

2006-10-15 07:59:45 · 4 answers · asked by dreamz 4

I have to make a container that will absorb heat and trap it to warm a cup of water for physical science.The container is going to be placed in the sun or under a lamp depending if the weather is nice for 30 minutes.Im not sure how to make the container,i need some suggestions.

2006-10-15 07:55:14 · 5 answers · asked by cutie_2009 2

Find the linearization of

1. 5x^2-3x=4, a=-5

2. (x)/(5x+8), a=0

3. tan x, a=pi

4. Use the linear approximation (1+x)^k is appox. 1+kx
Find an approx. for f(x)=(1-x)^4 for values of x near 0.

Find dy
5. y=7x^2 +3x +3

6. 6y^(1/2) -3xy +x=0

7. y=csc (6x^2-1)

8. Find approx. error |change in f -df|
x +x2, Xo=7, dx= .05

9. Write a diff. formula that estimates the given change in volume or surface area. The change in surf. area S=4(pi)r^2 of a sphere when the radius changes from r0 to (r0+dx)

10. A=(pi)r^2 .By approx. how much does the area of a circle decrease when the radius is decreasing from 20 cm to 1.8 cm. (use 3.14 for pi)

11 Estimate using linear approx.
(1.0005)^50

2006-10-15 07:06:34 · 3 answers · asked by Anonymous

If a proton were added to each of the germanium nuclei

2006-10-15 06:46:07 · 4 answers · asked by Melissa 2

but you'll find the speed at whicj the scent travels across the room is much less. Why?

2006-10-15 06:44:13 · 4 answers · asked by Melissa 2

2006-10-15 06:42:42 · 8 answers · asked by Anonymous

H2, H20, HE, Na,Nacl,H2SO4, or U

2006-10-15 06:42:16 · 4 answers · asked by Melissa 2

I'm having some trouble with this question:
Give an example of an object that is slowing down but has a positive acceleration.
Anyone have any ideas?

2006-10-15 06:40:21 · 5 answers · asked by kylec_11@sbcglobal.net 1

coloured pictures preferred...thanks!

2006-10-15 06:24:34 · 1 answers · asked by KeenaUsas 1

A 2.0 kg toy locomotive is pulling a 1.0-kg caboose. The frictional force of the track on the caboose is 0.50 N backward along the track. If the train's acceleration forward in 3.0 m/s^2, what is the magnitude of the force exerted by the locomotive on the caboose?

2006-10-15 06:11:41 · 1 answers · asked by collegegirl 2

2006-10-15 06:04:02 · 2 answers · asked by socratus 2

In this equation, how many carbon dioxide molecules are needed to produce one glucose molecule?

2006-10-15 05:55:27 · 3 answers · asked by Jesse 1

2006-10-15 05:35:04 · 3 answers · asked by louie_ellis 1

I understand it pretty much splits atoms. which from what i understand if fission. atom bomb stuff. isn't that extremely dangerous? and why aren't they using the energy that one of these accelerators puts off? too much to harness or what?

2006-10-15 05:34:37 · 3 answers · asked by heavyhauldad 3

2006-10-15 05:28:10 · 2 answers · asked by hash 1

I have the answer but I don't know how to solve the question.

2006-10-15 05:05:22 · 5 answers · asked by shadab a 2