Physics - September 2007

I need some help on solving this atwood problem. I already dound the first two components, I just need help figuring out how to and what equation to use for part C.) Please, solve out the entire portion if you can, because I have an idea of what equation to use, but I don't know HOW to solve for mass using it. Everything is provided in the pics! ty!

http://img.photobucket.com/albums/v84/Mittpuff/physics001.jpg
http://img.photobucket.com/albums/v84/Mittpuff/physics002.jpg

2007-09-30 14:46:14 · 1 answers · asked by Anonymous

A runaway truck lane heads uphill at 30° to the horizontal. If a 16000 kg truck goes out of control and enters the lane going 115 km/h, how far along the ramp does it go? Neglect friction.

2007-09-30 14:36:56 · 1 answers · asked by Nathan R 1

if a person on a space shuttle were to try to light a floating ball of gasoline, what would happen? does combustion rely on gravity?

2007-09-30 14:14:04 · 11 answers · asked by Belial 2

a concave mirror has a radius of curvature of 0.50cm.
where an object in front of the mirror must be placed in such a way that its image forms to 0,15 m behind the mirror

to 0.38m
b 0,19 m
c 0,093 m
d 0,77 m
and 0.57

2007-09-30 14:08:25 · 1 answers · asked by Anonymous

A pumped-storage reservoir sits 155 m above its generating station and holds 8.5 109 kg of water. The power plant generates 350 MW of electric power while draining the reservoir over an 8.0 hour period. What fraction of the initial potential energy is lost to nonconservative forces (i.e., does not emerge as electricity)?

2007-09-30 14:05:45 · 3 answers · asked by nathanr20 1

1) A truck needs to average 45 mi/hr in order tocomplete a haul on time. if the truck has been averaging 43mi/hr for the first 4.0 hours, whats must be its average speed for the remaining 1.0 hour of the trip?

2) A pilot taking off from an aircraft carrier is told to expecta tail wind of 42.0 km/hr. If the pilot's cruising speed is usually 625 km/hr, how long, in minutes will it take the plane to reach and island that is located 25.0 km from the carrier?

3) What is the average speed, in miles/hr, of a golf ball that travels 208 ft in 2.75 seconds?

Please show steps...I dont understand. Thanks a ton =)

2007-09-30 13:57:04 · 1 answers · asked by kickitup21 1

3/5x100
2/5x100
2/3x100
100%

2007-09-30 13:51:50 · 2 answers · asked by chato r 1

A tennis ball's initial velocity is 30m/s [S]. When struck by a tennis racquet, its velocity becomes 28m/s [n30w]. Determine the ball's change in velocity.

P.S. i tried several times but i dont know how the diagram for this question will look like. Can someone plz help and diagram wud be useful.

2007-09-30 13:51:17 · 1 answers · asked by cool :-D 1

2007-09-30 13:23:29 · 1 answers · asked by Mario A 1

A backpack full of blocks weighing 60.0N rests on a table in a physics laboratory classroom. A spring with a force constant of 160N/m is attached to the backpack and pulled horizontally. If the backpack begins to slide when the spring (k=160N/m) strectches by 2.40cm, what is the coefficent of the static friction between the backpack and the table?

2007-09-30 13:08:26 · 1 answers · asked by Anonymous

2007-09-30 12:59:41 · 3 answers · asked by maxpowerrys 1

What's the difference? Is steel usually forged and tempered at the same time? When would you want to use forged steel instead of tempered steel?

2007-09-30 12:50:09 · 1 answers · asked by John 1

Block of mass 3.8 kg is pushed on frictionless suface 4.6 m. By contant force of 16 N, 20 degrees below the horz.
Whats the work done by the normal force and force of gravity?

2007-09-30 12:43:51 · 1 answers · asked by ひいらぎ 5

A streetcar is freely coasting (no friction) around a large circular track. It is then switched to a small circular track. When coasting on the smaller circle its speed is:

a) greater
b) less
c) unchanged

2007-09-30 12:14:36 · 2 answers · asked by ? 6

it has to to with logarithmic tables

like with star brightness, they'll say the light was on an order of magnitude five times any other, which means it's a hundred times brighter

10 squared is 100, I don't get this

2007-09-30 11:31:03 · 1 answers · asked by SQD 2

what is this called?

2007-09-30 11:25:37 · 10 answers · asked by Jen Bug <3 2

Physics Experts Help! Ok A stick of butter has a volume of 120cmcubed and a mass of 110g. What is the volume?
A stick of butter has a volume of 120cmcubed and a mass of 110g. Explain reasoning for each step

A.What is the volume of 1g of butter?
B. What is the volume of 6g of butter?
C.What is the mass of 50cmcubed of butter?
QUESTION 2
the density of silver is 10.5g/cmcubed
A. What is the mass of 7cmcubed of silver
B. What is the volume of 64g of silver
C. How many 1cmcubed pieces of silver must be combined to have a total mass of 64g
D. How are questions B and C related?

Question 3
One cubic centimeter of copper has a mass of 8.9G What is the volume of a piece of copper with a mass of 1.23 KG?

Question 4
Suppose we have a piece of lead with a mass of 70g. How much will the volume of lead increase if we add 30g more lead to this piece? Lead has a density of 11.3g/cmcubed

2007-09-30 11:04:50 · 1 answers · asked by ????? ? 1

A car traveling at a constant speed of 45.0m/s passes a trooper hidden behind a billboard. One second after the speeding car passes the billboard, the trooper sets out in pursuit to catch it. The trooper accelerates at 3.00m/s^2 from rest. How long will it take the trooper to overtake the car?

2007-09-30 11:03:59 · 1 answers · asked by Anonymous

A force of magnitude 7.50 N pushes three boxes with masses and as shown in the figure. Find the magnitude of the contact force (a) between boxes 1 and 2, and (b) between boxes 2 and 3.

2007-09-30 10:47:16 · 2 answers · asked by Anonymous

The question is: when two waves interfere constructively or destructively, is there any gain or loss in energy?
The answer is that the total energy of the pair of waves remains the same because energy missing from zones of destrctive interference appears in zones of constructive interference.
However, if the standing wave has ONLY constructive of destructive interferance, what happens? The answer does not touch on that. Why is there no gain or loss in energy?

2007-09-30 10:05:31 · 2 answers · asked by Anonymous

2007-09-30 09:53:02 · 13 answers · asked by tomo4scrap 1

and im pretty sure you dont just divide it by 100, cuz its cubed.
i was told u mustiply by 10^-6. is this true and if so why?

2007-09-30 08:59:07 · 5 answers · asked by Wainwright for Cy Young 3

A ball thrown vertically upward is caught by the thrower after 4.0 s
1. find the initial velocity of the ball (upwards)
2. find the maximum height it reaches

2007-09-30 08:41:48 · 3 answers · asked by roofchelsea 1

A basketball leaves a player's hands at a height of 2.10 m above the floor. The basket is 2.60 m above the floor. The player likes to shoot the ball at a 37.5° angle. If the shot is made from a horizontal distance of 12.50 m and must be accurate to 0.22 m (horizontally), what is the range of initial speeds allowed to make the basket? Enter your answer to at least four significant digits.

lowest initial speed __ m/s
highest initial speed __ m/s

2007-09-30 08:35:04 · 1 answers · asked by Awan 2

electromagnetic induction ,mutual inductance ,self inductance

2007-09-30 08:08:20 · 1 answers · asked by vijay k 1

I have a test coming up and I just want to make sure Im clear on something:

Beta particles emit a positive B (positron) and a negative B (similar to the electron in the shells but this one comes from the nucleus) +B decay is proton rich so it turns a proton into a neutron which decreases the atomic number by 1, but the mass remains the same. -B decay is neutron rich so it turns it into a proton thus raising the atomic number by 1, while the mass remains the same. Both are types of isoberic decay and result in the formation of a more stable and different element than that of the parent.

Electron/positron annihalation occurs when an electron and positron collide resulting in 2 gamma rays that travel in opposite direction with 511kev each. this opposite direction is due to the conservation of momentum.

does this seem correct? and should i add anthing else..thanks!:)

2007-09-30 07:42:16 · 2 answers · asked by Kel 1

A basketball leaves a player's hands at a height of 2.10 m above the floor. The basket is 2.60 m above the floor. The player likes to shoot the ball at a 38.0° angle. If the shot is made from a horizontal distance of 13.00 m and must be accurate to 0.22 m (horizontally), what is the range of initial speeds allowed to make the basket? Enter your answer to at least four significant digits.

a. Find lowest initial speed
b. Find highest initial speed

2007-09-30 07:22:45 · 1 answers · asked by Anonymous

besides how much matter is in a given space
and if an object floats or not

2007-09-30 07:18:01 · 1 answers · asked by pazzo 3

i have to push a 100kg box up a 20degree ramp into the truck. (coeff of static friction)=0.9 and coeff of kinetic friction =0.6. my largest pushing force is 1000N. will i be able to push the box up the truck without assistance if i started running?If i stop on the ramp, will i be able to move the box again??

2007-09-30 06:49:56 · 1 answers · asked by berry 1

... for my physics hwk (gcse level) i have to 'write an epitaph dedicated to Newton' - can someone plz help me with any ideas?
thanks

2007-09-30 06:18:06 · 6 answers · asked by no-one listens... 2