Physics - January 2007

12. A body with a mass of 7 kg is accelerated at a rate of 24 m/s^2. What force is required?

13. Aforce of 565 N is needed to produce an accleration of 22 m/s^2. What is the mass of the acceleration body?

14.What is the rate of acceleration when 75 N of force are applied to an object with a mass of 15 kg?

15. Mom's old Cadillac (a 1974) has a mass of 1500 kg. What is the weight of the old heap?

16. An astronaut's weight on the moon is only 75 N and his mass was calculated to be 45.92 kg. What is the rate of acceleration due to gravity on the moon?

17. The Kentucky Derby winner has a mass of 556 kg. What is the weight of the animal?

18. Baby Huey has been in the refrigerator and pantry again! He is now up to 888 N. What is the mass of the bouncing baby boy?


PLEASE SHOW WORK AND FORMULA
THANK YOU

2007-01-30 12:27:24 · 4 answers · asked by J 6

I know that Cathode rays exist in the form of streams of high speed electrons emitted from the heating of a cathode inside a vacuum tube, at its rear end.The emitted electrons form a beam within the tube due to the voltage difference applied across the two electrodes (the CRT screen typically forms the anode). The beam is then perturbed (deflected), either by a magnetic or an electric field, to trace over ('scan') the inside surface of the screen (anode). The screen is covered with a phosphorescent coating (often transition metals or rare earth elements), which emits visible light when excited by the electrons.Which means you need a curved surface to make the image appear undistorted so how do they do it with a flat surface?

Thanks ahead of time!

2007-01-30 12:12:35 · 1 answers · asked by Anonymous

Please tell me all the steps, and nothing else can be used other than the piece of aluminum foil.

2007-01-30 11:54:57 · 5 answers · asked by canadiangeoguy 2

It is possible to use a Geiger Muller Tube to measure the activity of Cobalt 60 (Co 60)?

2007-01-30 11:48:46 · 3 answers · asked by Emily1318 1

its for a graph and nothing online tells me and nobody i can reach nows!!! HELP

2007-01-30 11:46:17 · 4 answers · asked by Anonymous

choice of time?

2007-01-30 11:44:24 · 2 answers · asked by sunshine! 1

If C->(please imagine thats an arrow on top of the C indicating its a vector) is the vector sum of A-> and B->,C->=A-> + B->, what must be true if C=A + B? What must be true if C=0?


Im having some trouble wrapping my head around these kinds of problems, I'm not even quite sure where to start :(

2007-01-30 11:39:18 · 7 answers · asked by 11 2

of the collision?

2007-01-30 11:38:51 · 4 answers · asked by sunshine! 1

eh help

2007-01-30 11:36:42 · 2 answers · asked by Grace B 1

A 10.0 m tall open water tank has a nozzle 2.0 meters from it's bottom. The nozzle has a cross sectional area of 0.016 meters squared. What is the rate of discharge from the nozzle, assuming that the water has no kinetic energy in the tank?

2007-01-30 11:34:59 · 1 answers · asked by jsprplc2006 4

Accroding to Newton's law of interaction, for every force you exert on an object , the object also exerts an eqaul but opposite force on you. Will it be possible for you to accelerate the object in view of this equal and opposite forces?

2007-01-30 11:31:29 · 4 answers · asked by sunshine! 1

I know the answer can vary depending on the type of gun and bullet you use but on average how far does it travel (let's assume a 92f 9mm). Also, once you shoot the bullet and it travels up towards the skies it eventually loses momentum and then falls to the ground, isnt it so? So if this happens when the bullet falls back to the ground the momentum and speed can also be just as detrimental to be fatal if it lands on someone's head, am I right?

If someone can shed light on this that would be great.

Thanks!

2007-01-30 11:31:15 · 4 answers · asked by Truth 2

I don't fully understand how it's possible to work this problem with so little information. I would like some steps to solving this. Thanks in advance.

In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 27 000 V. The speeds of the electrons are quite large, and for accurate calculations of the speeds, the effects of special relativity must be taken into account. Ignoring such effects, find the electron speed just before the electron strikes the screen.

2007-01-30 11:27:59 · 2 answers · asked by blah 1

buoyancy force.. time to take submerge objects to the surface

2007-01-30 11:24:24 · 3 answers · asked by Erick 1

In the first part of the movie "Pirates of the Caribbean: The Curse of the Black Pearl", Captain Jack Sparrow and Will Turner are seen walking along the bottom of a bay underneath an overturned boat in an attempt to board and commandeer a nearby ship. In a couple shots, they are shown with their heads on the inside of the boat, and they are able to breathe and even talk. The problem, though, is that the water is all around them, and even above them for quite some way.

I know that some may explain this similar to an old childhood game, where one would take a cup and submerge it in a large basin of water, and then remove it from the water upside-down, causing the water to exit the cup, but not allowing air to get in the empty space, forming a vacuum. What I am wondering is if this would be possible with a boat as it is shown in the movie, and, if so, how one would be able to breathe in a vacuum. I do realize that the movie is a work of fiction.

Thanks for the help!

-Mr. X

2007-01-30 11:22:51 · 5 answers · asked by Mr. X 2

A ball is thrown upward from the top of a 60.0 m tall building. The ball's initial speed is 12.0 m/s. At the same instant, a person is running on the ground at a distance of 41.0 m from the building. What must be the average speed of the person if he is to catch the ball at the bottom of the building?

2007-01-30 11:19:04 · 7 answers · asked by Anonymous

If the force of friction is 2 newtons, what is the mass of the box?

2007-01-30 10:50:33 · 3 answers · asked by nkh0003 1

A object is launched up into air like a roller coaster which goes up an comes back down and goes back up again for unknown times. I have to find the v max then find the acceleration of the roller coaster.
Using the elastic potential energy i found the PE to be 37500 , where k = 750 x = 10m. then used the conservation of energy to find the v max = 12.25. mass = 100 kg
now i need to find the acceleration. HOW DO i DO THAT? please help ASAP!!!

2007-01-30 10:48:06 · 4 answers · asked by aero 1

1)Assume a 9 kg bowling ball moving at 2 m/s bounces off a spring at the same speed that it had before bouncing..
a)What is its momentum of recoil?
b) What is its change in momentum?
c)f the interaction with the spring occurs in 0.5 s, calculate the average force the spring exerts on it.

2) A group of playful astronauts, each with a bag full of balls, form a circle as they free-fall in space. Describe what happens when they begin tossing balls simultaneously to one another.

2007-01-30 10:16:33 · 1 answers · asked by Jane A 3

Imagine that you are hovering next to the space shuttle in an Earth orbit. Your buddy of equal mass, who is moving at 8 km/h with respect to the shuttle, bumps into you. If he holds onto you, how fast do you both move with respect to the ship?

2007-01-30 10:02:38 · 5 answers · asked by Jane A 3

A archer puts a .3kg arrow into the bowstring. An average force of 201N sis exerted to draw the bowstring 1.3m.

a) if there is no friction, what velocity does the arrow have when it leaves the bow?

When i worked it out using two different ways, the answer is conpletely different. They are supposed to be the same.

here's the first way:
To find the energy store in the bowstring
W=Fx
W= (201N) (1.3m)
W= 261.3J

W=KE
W= 1/2mv^2
261.3J = 1/2 (.3kg)v^2
V= 41.73m/s
_________________________
here is another way that i used.
I find the spring constant first
F=kx
201N = k(1.3m)
k= 154.62 N/m

EPE = 1/2kx^2
EPE = 1/2(154.62N/m)(1.3m)^2
EPE = 130.65J

EPE=KE
EPE=1/2mv^2
130.65J = 1/2(.3kg)v^2
v= 29.5m/s

i don't know which way is correct, this really drives me crazy. If the first way is correct, then why not the second way? and if the second way is correct, then why not the first way?
can somebody please explain??? i really need help.

2007-01-30 10:02:09 · 2 answers · asked by Ha!! 2

2007-01-30 09:57:59 · 3 answers · asked by Zach C 1

2007-01-30 09:47:44 · 18 answers · asked by Domo 3

This question has been on my mind for a long time and cant figure it out.

2007-01-30 09:32:53 · 4 answers · asked by Mike 4

2007-01-30 09:20:34 · 5 answers · asked by cathy r 1

2007-01-30 09:15:43 · 4 answers · asked by moninminnie@btinternet.com 1

A curve of radius 120m is banked at an angle of 18 degrees. At what speed can it be negotiated under icy conditions where friction is negligible?

2007-01-30 09:08:34 · 6 answers · asked by katmariea 1

Since charge is conserved why is there no return?

2007-01-30 08:51:34 · 7 answers · asked by Anonymous

2007-01-30 08:30:17 · 6 answers · asked by naenae 1

a -7.0 µC and a +6.0 µC charge 5.0 cm apart? Assume no other charges are nearby.

The choices for the direction answer are:
a.) toward the positive charge
b.) perpendicular to the line between the charges
c.) toward the negative charge
d.) none of these

Please help. Thanks.

2007-01-30 08:28:29 · 3 answers · asked by abc123 1