Physics - October 2007

The tallest volcano in the solar system is the
31 km tall Martian volcano, Olympus Mons.
Assume: An astronaut drops a ball off the
rim of the crater and that the free fall acceler-
ation of the ball remains constant throughout
the ball's 31 km fall at a value of 2.9 m/s2.
(We assume that the crater is as deep as the
volcano is tall, which is not usually the case
in nature.)
a) Find the time for the ball to reach the
crater floor. Answer in units of s.


b) Find the magnitude of the velocity with
which the ball hits the crater floor. Answer in
units of m/s.

2007-10-15 08:57:51 · 1 answers · asked by Sarah B 1

3- tiered bithday cake rests on a table. from bottom to top the cake tiers weigh 16, 9, 5 respectively
find the magnitude and direction of normal force acting on 2nd tier?

2007-10-15 08:52:48 · 1 answers · asked by big daddy 2

2007-10-15 08:49:10 · 2 answers · asked by Anonymous

An object is released from rest on a planet
that has no atmosphere. The object falls
freely for 4.7 m in the first second.
What is the magnitude of the acceleration
due to gravity on the planet? Answer in units
of m/s2.

2007-10-15 08:48:58 · 1 answers · asked by Anonymous

Bricklaying. An ingenious bricklayer builds a device for shooting bricks up to the top of the wall where he is working. He places a brick on a vertical compressed spring with force constant k = 450 N/m and negligible mass. When the spring is released, the brick is propelled upward.

If the brick has mass 1.80 kg and is to reach a maximum height of 3.6 m above its initial position on the compressed spring, what distance must the bricklayer compress the spring initially? (The brick loses contact with the spring when the spring returns to its uncompressed length.)

I need some help with this problem. I have no idea what to do. Please show me the steps on getting the answer. Thanks a ton!

2007-10-15 08:35:23 · 1 answers · asked by nglennie_06 1

If a person were to weigh themselves on an airplane and the airplane were to suddenly loose pressure, would he or she weigh less due to a smaller buoyant force?

2007-10-15 08:08:52 · 2 answers · asked by imcool1466 1

Do the particles become denser or increase, or what?

2007-10-15 08:03:12 · 3 answers · asked by spencer 2

2007-10-15 07:27:20 · 4 answers · asked by spencer 2

Had a quick question for a physics density problem.

Pure copper penny mass = 3.083 g
Copper-clad Zinc penny mass= 2.517g
Total Volume of each penny is the same.
Density of copper is 8.960 g/cm^3
Density of zinc is 7.133 g/cm^3

What fraction of the volume of the new penny is occupied by zinc?

I'm a bit lost on this problem...could you possibly show your work. Thanks much!

2007-10-15 06:46:55 · 3 answers · asked by cjoak 1

I am talking about the colours!!!!!

2007-10-15 06:24:40 · 1 answers · asked by deepak.dhall 1

A block has a mass of 5.87 kg and density of 496 kg/m^3. A piece of lead is placed on top of the block, adn the sytem floats in water. It is observed that 0.736 of the block's volume is submerged. The density o f lead is 11.3x10^3 kg/m3.

1. What is the mass of the lead?

2. The lead is removed from the top, and a different piece of lead is attached to the bottom of the block. Its mass is such that the same 0.736 of the block's volume is subermged. It shi mass greater than, less than or equal to the mass found in Question 1? Explain

Please help...I'm so lost.

2007-10-15 06:15:28 · 1 answers · asked by nita 1

Say I have a helium balloon that has an envelope of 3800 cubic feet (to lift a payload of 200lbs at sea level atmospheric density and gravitational attraction). What will the maximum altitude (in feet) be for this craft before it achieves neutral bouyancy with the atmosphere? ALSO: At what point will the helium envelope no longer be able to contain the helium (in feet)? What if this envelope was rigid? (in this case I would include the airframe weight in with the overall payload weight)

2007-10-15 06:14:19 · 1 answers · asked by CaptainGarry 1

A helicopter ascends at a constant speed of 5m/s, how far does it rise in 5 sec?

2007-10-15 05:37:31 · 2 answers · asked by Geno W 1

a block is at rest on the incline shown in the figure. the coefficients of static and kinetic friction are s = 0.42 and k = 0.36 respectively. The acceleration of gravity is 9.8 m/s^2. the angle is 19 degrees.

what is the frictional force acting on the 43 kg mass? answer in units of N.

2007-10-15 05:14:01 · 3 answers · asked by grouchy187 2

A softball pitcher rotates a 0.250 kg ball around a vertical circular path of radius 0.4 m before releasing it. The pitcher exerts a 33.0 N force directed parallel to the motion of the ball around the complete circular path. The speed of the ball at the top of the circle is 13.0 m/s. If the ball is released at the bottom of the circle, what is its speed upon release?

Answer in m/s.....i have no clue how to solve this problem...i be greatly appriciate if someone can do it in step so i know how or where did that answer come from...thanks...

2007-10-15 05:11:53 · 3 answers · asked by pinkepromise 2

2007-10-15 05:05:09 · 9 answers · asked by tercentenary98 6

Gravity doesnt affect a flame in space.

2007-10-15 04:52:07 · 1 answers · asked by Babiiee Laura Jaynee =] 1

Two very long parallel cylindrical channles are drilled through a very large block of material. The block is so large, that it can be considered infinitely large.

http://i24.tinypic.com/2mhu73s.jpg

The diameter of the channels is 16cm, and distance between theier centers is 20cm. One cylinder contains cold +10C water, and the other contains hot +50C water. Thermal conductivity of the material is 100 mW/cm/C.

How much heat flows from hot to cold water per 1cm length?

2007-10-15 04:31:47 · 3 answers · asked by Anonymous

2007-10-15 04:15:07 · 5 answers · asked by quenzie_jane0627 1

after all sound waves travel to pinna where all waves meet
how come ear know which direction it has come from

2007-10-15 03:23:16 · 3 answers · asked by kushan j 2

2007-10-15 03:05:59 · 3 answers · asked by carlo s 1

Do I have to find the number of electrons in the 3kg of Water first, and then multiply that by the charge of an electron?

2007-10-15 03:01:39 · 2 answers · asked by KJ317 2

Assume a relatively cold temperature (-30 degrees celsius). Could a strong enough wind make it warmer for you than no wind at all?

For example, in the case of stowaways riding a plane (there've been a few cases), I believe the speed-induced friction could be quite significant.

2007-10-15 02:48:14 · 4 answers · asked by Anonymous

2007-10-15 02:43:11 · 7 answers · asked by Frances 2

A stunt pilot of mass 55.0 kg who has been diving her airplane vertically pulls out of the dive by changing her course to a circle in a vertical plane.If the plane's speed at the lowest point of the circle is 95.8m/s , what is the minimum radius of the circle for the acceleration at this point not to exceed 4.00 g?
Take the free fall acceleration to be = 9.80 .What is the apparent weight of the pilot at the lowest point of the pullout in this case?
Take the free fall acceleration to be = 9.80 m/s^2.

2007-10-15 02:40:31 · 2 answers · asked by Natiphy2007 1

spot the errors and point them out to me with the correction!!! thanks.......(not grammar, knowledge)

all waves require a medium to travel in. waves carry the medium from place to place. the height of the crest of the wave or the depth of the trough is called the amplitude. the distance between two crests is the wavelength. the number of waves per second is the frequency.

2007-10-15 02:27:47 · 2 answers · asked by Anonymous

frequency of radiation in a microwave oven is 2.45 x 10 ^ 9 Hz. show that the wavelength is about 12 cm

2007-10-15 02:24:11 · 4 answers · asked by Anonymous

answer!!!

2007-10-15 01:28:34 · 10 answers · asked by zack l 1

neils bhors model of atom

2007-10-15 01:16:18 · 2 answers · asked by kannan 1

I've allways wondered if Dark Matter and Antimatter were close together because Dark matter can't been seen and I would think that antimatter couldn't be seen either. Seeing as antimatter is the opposite of regular matter.

2007-10-15 01:05:00 · 2 answers · asked by crapp420 2