Physics - November 2007

....when I can't see anything when I look directly at it?

2007-11-06 00:18:17 · 5 answers · asked by insomnia c 4

in a lab we used a dynamic cart photogate smart timer etc

2007-11-05 23:29:19 · 2 answers · asked by tonet 1

2007-11-05 23:00:32 · 13 answers · asked by Anonymous

it will return back down right? I just had a test at my school about these thing and a question popped up in my head, if the bullet comes down, it will have a high velocity right? Can it hurt someone as bad as a bullet fired directly at the person?

My guess is no, because air friction won't make the bullet as fast.

Please explain what would actually happen and correct me if I'm wrong...

2007-11-05 22:40:18 · 14 answers · asked by Anonymous

2007-11-05 22:35:49 · 5 answers · asked by Anonymous

2007-11-05 22:29:56 · 4 answers · asked by Anonymous

2007-11-05 22:16:17 · 11 answers · asked by davon f 1

A 100 N table is pushed by a horizontal force of 40 N for 3 s. What is the velocity of the table at the end of 3 s? The coefficient of kinetic friction between the floor and table is 0.25.

Please identify the given, formula and solution..thank you!

2007-11-05 21:29:11 · 3 answers · asked by Anonymous

A car has a mass of 1800 kg. It is traveling at a velocity of 17m/s northward. A gravel and sand delivery truck with a mass of 3000 kg moving at 20m/s southward collided head on with the car. They stick together upon colliding with each other. Find their common velocity after the collision.

please identify the given, formula and solution..,thank you..

2007-11-05 21:26:06 · 4 answers · asked by Anonymous

about physics...

2007-11-05 21:11:11 · 8 answers · asked by Jeber 2

Note: the Earth would slow down spinning very slowly, that is as 'safely' as possible so that things and people wouldn't get thrown off because of the slowing rotation.

2007-11-05 20:11:18 · 7 answers · asked by Doctor A 2

You are holding a shopping basket at the grocery store with two 0.50 kg cartons of cereal at one end of the basket. The basket is 0.79 m long. Where should you place a half gallon of milk (1.8 kg) so that the center of mass (COM) of your groceries is at the center of the basket?

2007-11-05 18:20:37 · 1 answers · asked by =P 6

In a football game, a tackle running at a constant speed of 6 m/s tackles a stationary receiver. The two fly off horizontally at 3 m/s. If the mass of the tackle is 145 kg,

a.) What is the mass of the receiver?

b.) Calculate the kinetic energy of the tackle-receiver system before and after the collision.
KEsys, i =
KEsys, f =

2007-11-05 18:19:04 · 2 answers · asked by =P 6

/\
/...\
/ \
the figure is in the form of the letter A the gaps and the dotted line in the middle represent the resistors there are totally 5 of them each of resistance 3 ohm
find the resistance between th points x and y
and explain how u did it

/\
/…\
x / \y

2007-11-05 18:03:56 · 3 answers · asked by Anonymous

Suppose a rotating spherical body such as a planet has a radius r and a uniform density p, and the time required for one rotations is T. At the surface of the planet, the apparent acceleration of a falling object is reduced by the acceleration of the ground out from under it. Derive an equation for the apparent acceleration of gravity,g, at the equator in terms of r,p,T, and G.

Applying the equation above, what fraction is the apparent weight reduced at the equator compared to the poles, due to the Earth's rotation?

From the equation above, derive an equation giving the value of T for which the apparent acceleration of gravity becomes zero, such as objects can spontaneously drift off the surface of the planet. Show that T only depends on p, and not on r.

2007-11-05 17:55:44 · 1 answers · asked by Anonymous

a crate and its load have a combined mass of 1600 kg. what is the tension in the supporting cable when the crate, originally moving downward at 12 m/s, is brought to rest with constant acceleration in a distance of 42 m.

please show how to solve and also answer

2007-11-05 17:40:01 · 2 answers · asked by magna1211@sbcglobal.net 1

a satelite in a low orbit around the earth can lose energy due to a very thin atmosphere. As it loses energy it falls down to a lower orbit. How does its speed change

2007-11-05 16:24:40 · 4 answers · asked by karri 1

Both emits similar light except for the difference in shape

2007-11-05 15:37:25 · 4 answers · asked by kandan 1

A force problem?
A 873-kg (1930-lb) dragster, starting from rest, attains a speed of 26.3 m/s (58.9 mph) in 0.59s.
i posted this before, but i forgot to say it asks for average acceleration and the magnitude of the average net force....how can i find the average net force??/

2007-11-05 15:05:39 · 2 answers · asked by Anonymous

Thomas Edison proposed distributing electrical energy using constant voltages (DC). George Westinghouse proposed using the present AC system. What are the reasons the Westinghouse system was adopted?

2007-11-05 14:55:42 · 2 answers · asked by werewulf2000 2

A vertical spring (ignore its mass), whose spring constant is 930 N/m, is attached to a table and is compressed 0.160 m.
(a) What speed can it give to a 0.500 kg ball when released?
m/s
(b) How high above its original position (spring compressed) will the ball fly?

2007-11-05 14:32:31 · 2 answers · asked by Anonymous

A yo-yo has a rotational inertia of 950 g cm^2 and a mass of 120 g. Its axle radius is 3.2 mm, and its string is 120 cm long. The yo-yo rolls from rest down to the end of the sting.

(a) What is the magnitude of its translational acceleration?

(b) How long does it take to reach the end of the string?

As it reaches the end of the string, what are its (c) translational speed, (d) translational kinetic energy, (e) rotational kinetic energy, and (f) rotational speed?

Explain your work. Thanks! :)

2007-11-05 14:28:13 · 1 answers · asked by Anonymous

A workers pushes a 1.5 x 10^3 N crate with a horizontal force of 345 N a distance of 24.0 m The coefficient of kinetic force between the crate and the floor is 0.220.

a. How much work is done by the worker on the crate?
b. How much work is done by the floor on the crate?
c. What is the net work done on the crate?

A 0.075 kg ball in a kinetic sculpture is raised 1.32m above the ground by a motorized vertical conveyor belt. A constant frictional force of 0.350 N acts in the direction opposite the conveyor belt's motion. What is the net work done on the ball?

2007-11-05 14:16:26 · 1 answers · asked by redalert 2

A spring with k = 10.0 N/m is at the base of a frictionless 30.0° inclined plane. A 0.50 kg object is pressed against the spring, compressing it 0.3 m from its equilibrium position. The object is then released. If the object is not attached to the spring, how far up the incline does it travel before coming to rest and then sliding back down? (See the figure below.)
_________m

Can someone show me how to solve this in steps? I've tried many times and I can't seem to get the right answer. Thanks!

2007-11-05 14:05:39 · 3 answers · asked by Anonymous

Name the coordinates of B' if B(-3,4) is rotated:
90 degrees about (-1,-2)
and 180 degrees about (3,3)
and please can you explain why it is to me?
im not understanding any of this

2007-11-05 14:02:52 · 1 answers · asked by Anonymous

A projectile is shot from the edge of a cliff h = 225 m above ground level with an initial speed of v0 = 105 m/s at an angle of 37.0° with the horizontal, as shown in Fig. 3-39.

I uploaded Figure 3-39 at this site: http://i20.tinypic.com/16c9oio.jpg

(a) Determine the time taken by the projectile to hit point P at ground level.
(b) Determine the range X of the projectile as measured from the base of the cliff.
(c) At the instant just before the projectile hits point P, find the horizontal and the vertical components of its velocity (take up and to the right as positive directions).
(horizontal component)
(vertical component)
(d) What is the the magnitude of the velocity?
(e) What is the angle made by the velocity vector with the horizontal (below the horizontal)?

Thanks soo much!!!!!!!!!!!!

2007-11-05 13:46:20 · 5 answers · asked by Bollywood Masti 4

2007-11-05 13:40:45 · 5 answers · asked by Melvin :D 2

i need help i tried like every site and it will not help me

2007-11-05 13:38:09 · 2 answers · asked by Anonymous

Is it possible to get beyond the earth's gravitational field if you go far enough away from the earth?

a) Yes, you can get beyond the reach of the earth's gravity.

b) No, you cannot get beyond the reach of the earth's gravity.

2007-11-05 13:32:43 · 4 answers · asked by ? 6

A workers pushes a 1.5 x 10^3 N crate with a horizontal force of 345 N a distance of 24.0 m The coefficient of kinetic force between the crate and the floor is 0.220.

a. How much work is done by the worker on the crate?
b. How much work is done by the floor on the crate?
c. What is the net work done on the crate?

A 0.075 kg ball in a kinetic sculpture is raised 1.32m above the ground by a motorized vertical conveyor belt. A constant frictional force of 0.350 N acts in the direction opposite the conveyor belt's motion. What is the net work done on the ball?

2007-11-05 13:30:16 · 2 answers · asked by redalert 2