Physics - December 2006

The asteroid Ceres has a mass of 7.0 * 10^20 kg and a radius of 500 km.

a. What is the gravity on the surface of Ceres?

b. How much would a 90-kg astronaut weigh on Ceres?

Please help me with this problem.
I'm having trouble understanding it.

2006-12-11 11:27:57 · 2 answers · asked by vicky p 1

I need this information for a graduation project. If you have any websites, articles, or books that could be helpful I would be more than grateful. Thanks!

2006-12-11 11:20:33 · 3 answers · asked by sarah l 1

2006-12-11 11:10:58 · 4 answers · asked by jbeal68 1

a useful rate associated with a fluid system is _______. (select the correct answer.)

a. volume-flow rate
b. fluid speed
c. mass-flow rate
d. both a and c.

2006-12-11 11:06:27 · 2 answers · asked by Chris D 1

2006-12-11 11:05:26 · 3 answers · asked by hazu121 1

Its a question on my final review. I just want to know how to do the problem. And the answer, obviously.

2006-12-11 11:05:04 · 5 answers · asked by Francisco E 1

The driver of a 1100kg car moving at 17m/s brakes quickly to 12m/s when he spots a local garage sale. (a) Find the change in the car's kinetic energy. (b) Explain where the "missing" kinetic energy has gone.

2006-12-11 11:04:17 · 3 answers · asked by Anonymous

T or F...large stars live longer than small stars?

2006-12-11 10:41:37 · 6 answers · asked by brian k 1

I dont know which angle to use,,,for example on this problem: four forces are acting on a hot-air balloon: F1=2280.0 N up, F2=2250.0 N down, F3= 85.0 N west and F4= 12.0 N east. What is the precise direction of the net external force on the balloon. The answer should be about 23.3 degrees above West,,,,,please show me how to do this problem...thanks!!

2006-12-11 10:35:11 · 3 answers · asked by need4speed 2

2006-12-11 10:31:41 · 4 answers · asked by gary h 1

A gas is contained in a chamber such as that in Figure 15.5. Suppose the region outside the chamber is evacuated and the total mass of the block and the movable piston is 120 kg. When 2030 J of heat flows into the gas, the internal energy of the gas increases by 1745 J. What is the distance s through which the piston rises?
http://www.webassign.net/CJ/15_05.gif

2006-12-11 10:15:15 · 2 answers · asked by khoi2201 2

2006-12-11 09:52:48 · 7 answers · asked by Backtoschool 2

If you wish to cool a warm can of fruit salad by quickly putting it in the fridge, would you leave the paper wrapper on or remove it? Assume that the conductivity of the wrapper is much smaller than that of the can.

2006-12-11 09:22:39 · 4 answers · asked by lindsey_6_3 2

Ona camping trip a wooden box is to be used as an outdoor refrigerator. How would you suggest painting the exterior or the box to minimize absorption of visible electromagnetic radiation? Explain.

2006-12-11 09:21:06 · 8 answers · asked by lindsey_6_3 2

11. Calculate the minimum amount of energy necessary for a 1250 kg rollercoaster to complete a vertical loop, radius of 30 meters, safely for the riders.

12. How tall must the hill leading in to the loop be if the roller coaster has a velocity of 12 m/s at the top of the hill?

2006-12-11 09:07:11 · 1 answers · asked by Anonymous

2006-12-11 08:22:33 · 4 answers · asked by J L 1

THIS IS A PHYSICS EXPERIMENT. I must build around the egg with these straws and tape. What should i do?

2006-12-11 08:09:30 · 7 answers · asked by Drew 2

2006-12-11 08:05:57 · 6 answers · asked by voodoo 2

2006-12-11 07:38:39 · 17 answers · asked by Crackerass 2

In computing, some problems are considered impossible to parallelize. My intuition tells me that reality acts in a completely parallel manner, but I am not a physicist.

I was wondering if any physicists could answer this question, or point me in the direction of related research (if any exists). As well, I would be interested in research about how systems develop that cannot be made parallel, if reality itself is inherently parallel.

2006-12-11 07:14:03 · 2 answers · asked by Charles Ellis 1

TIME SLOWS DOWN WEN U TRAVEL AT D SPEED OF LIGHT, only if our physical age does not increase, then its true ?
einstein said in his theory of relitivity that time slows down if we travell at the speed of light, THE QUESTION WHICH COMES TO MY MIND IS.... its only acceptible if our physical age also slows down and when we travel at the speed of light spending one year in outer space then our physical age should aslo increase one year only, other wise YOU MAY SAY , only your clock slows down at the speed of light ... WHAT DO YOU SAY ?

2006-12-11 07:13:11 · 6 answers · asked by cajohnson667 3

A 2 ton UPS truck descending a 5 degree hill is brought to a stop at 250 ft. The driver applies the brakes so that the wheels lock. A) If the coeffiecient of kinetic friction between the truck tires and the road is 0.60, how much work in Joules is done by the force of friction in stopping the truck? B) How much work is done on the truck by gravity??

2006-12-11 07:12:26 · 2 answers · asked by Tennis2127 2

2006-12-11 07:03:25 · 15 answers · asked by Anonymous

2006-12-11 06:51:36 · 17 answers · asked by James 1

einstein said in his theory of relitivity that time slows down if we travell at the speed of light, THE QUESTION WHICH COMES TO MY MIND IS.... its only acceptible if our physical age also slows down and when we travel at the speed of light spending one year in outer space then our physical age should aslo increase one year only, other wise YOU MAY SAY , only your clock slows down at the speed of light ... WHAT DO YOU SAY ?

2006-12-11 06:41:02 · 6 answers · asked by ummu 1

It is for a report in Physics so make it detailed please!

2006-12-11 06:16:09 · 20 answers · asked by ohhsexual 1

My daughter has to make a bar of soap move without touching it with human contact or with a stick, rope, etc.
I need help....

2006-12-11 06:15:12 · 9 answers · asked by Anonymous

2006-12-11 05:58:52 · 4 answers · asked by Anonymous

2006-12-11 05:49:59 · 2 answers · asked by prashanta k 1

2006-12-11 05:44:40 · 3 answers · asked by jrgreenfield1 2