Physics - April 2007

A 1.40-OLHMS resistor is connected across a 9.00-V battery. The voltage between the terminals of the battery is observed to be only 8.50 V. Find the internal resistance of the battery.

2007-04-01 13:42:40 · 3 answers · asked by neverconsiderlifeonascale 1

The base of the incline is 4.0m and the height of the incline is 3.0m.

How much work must be done against gravity to move the block to the top of the incline?

a. 10 J
b. 60 J
c. 80 J
d. 100 J

2007-04-01 13:26:16 · 3 answers · asked by Anonymous

2007-04-01 13:24:14 · 3 answers · asked by dan g 1

3.0 meters to the east , and then 4.0 meters to the north. What is the total work done on the object?

a. 10. J
b. 14 J
c. 28 J
d. 56 J

2007-04-01 13:23:38 · 1 answers · asked by Anonymous

2007-04-01 13:21:35 · 6 answers · asked by Anonymous

a. acts vertically on a cart that can move only horizontally
b. is exerted by one team in a tug of war when there is no movement
c. is exerted on a wagon while pulling it up a hill
d. of gravitational attraction acts on a person standing on the surface of Earth

2007-04-01 13:09:12 · 3 answers · asked by Anonymous

How can a plane mirror be thought of as a special case of a spherical mirror? What is the focal length of a plane mirror? Does the spherical mirror equation work for plane mirrors with this choice of focal length? What is the transverse magnification for any image produced by a plane mirror?

2007-04-01 12:53:00 · 2 answers · asked by Sir Guitarist 2

A 1.00 kg block of ice at 0 degrees C is added to a picnic cooler. How much heat will the ice removeas it melts to water 0 degrees C?

how can you solve this problem?

2007-04-01 12:41:49 · 3 answers · asked by Hannah 1

A 1.00 kg block of ice at 0 degrees C is added to a picnic cooler. How much heat will the ice removeas it melts to water 0 degrees C?

2007-04-01 11:05:55 · 2 answers · asked by Hannah 1

...a two-way mirror. Would you be able to look in, and see infinity?

2007-04-01 10:53:57 · 4 answers · asked by Anonymous

Use the terms magnetic flux, induced current, and Lenz's law.

2007-04-01 10:02:57 · 3 answers · asked by abc123 1

2007-04-01 09:30:48 · 1 answers · asked by keisha c 1

2007-04-01 08:56:27 · 3 answers · asked by littatine 2

2007-04-01 08:54:55 · 4 answers · asked by littatine 2

A body oscillates with simple harmonic motion along the x-axis. Its displacement varies with time according to the equation:

x(t) = A sin(W t + phi)

If A = 3 m, W= 2.999 rad/s, and phi = 1.0472 rad, what is the acceleration of the body at t = 3 s?

Note: The argument of the sine function is in radians rather than degrees. Answer in units of m/s^2.

2007-04-01 08:47:06 · 1 answers · asked by emz 1

Can anyone show me how to convert the following decimals to ohms?
0.01020 = ?ohms
0.01237 = ?ohms
0.01339 = ?ohms

Any help is appreciated

2007-04-01 08:45:44 · 2 answers · asked by angelgirl 2

Hey, my physics teacher isn't so helpful, I need a how to on this question:

A periodic transverse wave that has a frequency of 10.0 Hz travels along a string. The distance between a crest and either adjacent trough is 2.50 m. What is it's wavelength?

I know that period=1/frequency, frequency=1/period, and speed=wavelength/period. I also know I need the third equation to solve this, but how do I find speed? What am I supposed to do with it?

If someone could do a little walkthrough, it'd be greatly appreciated!

Thanks everyone.

2007-04-01 08:44:16 · 3 answers · asked by ? 2

A small spherical ball of radius r = 1.7 cm rolls without slipping down a ramp and around a loop-the-loop of radius R = 3.1 m. The ball has mass M = 345 g.

How high above the top of the loop must it be released in order that the ball just makes it around the loop?

Repeat problem (a) for a disk. Find the ratio of the heights h for the two cases.


I used conservation of energy and set mgh = KE(rot) + KE(trans) + mg2R. Using V=sqrt(Rg), I found the minimum speed the ball must have at the top of the loop and found it to be 5.512 m/s. For the right side of the equation, I used KE(rot) = 1/2Iw(omega)^2. For a spherical ball, I =2/5MR^2.
Now I have
mgh = 1/2mv^2 +1/2(2/5)MR^2(w^2) + 2mgR
M's cancel
w = v/R
So I was left with
h = (1/2(v^2)+1/5(R^2)(v/R)^2 + 2gR)
----------------------------------
g
h = 8.37m
h-2R = H = 2.17m

Is that right? and how would I do it for a disk.

2007-04-01 07:30:58 · 1 answers · asked by Pritesh P 2

2007-04-01 07:22:41 · 5 answers · asked by Rensie C 1

2007-04-01 07:17:10 · 6 answers · asked by ALAN K 1

What evidence supports the view that light has particle properties

2007-04-01 06:51:41 · 5 answers · asked by Melissa 2

2007-04-01 06:49:32 · 4 answers · asked by Melissa 2

my last question left me completely confused
some said they were all fundamentals while others said
electrons and protons or just electrons
wo can tell me for sure which are fundamental?....and why exactly
thanks!!!

2007-04-01 06:25:21 · 8 answers · asked by Michelle 1

A current of 300 A is required from a 240 V, 15 A supply. A transformer with 200 primary turns in available. How many turns are on the secondary.

I got an answer of 4000, but the book gives me an answer of 10, who is right? I'm assuming it's an ideal transformer.

Thanks

2007-04-01 06:19:06 · 3 answers · asked by Anonymous

Two ice skaters stand at rest in the center of an ice rink. When they push off against one another the 45 kg skater acquires a speed of 0.73 m/s. If the speed of the other skater is 0.89 m/s, what is this skater's mass?
kg

2007-04-01 06:09:59 · 3 answers · asked by soccerjock 2

How do you calculate the net charge of an entire atom
and the net charge of the atomic nucleus?
how can you tell if something is a fundamental particle?

2007-04-01 06:03:25 · 7 answers · asked by Michelle 1

2007-04-01 05:42:20 · 6 answers · asked by Twilght_lvr 2

Zero is neither positive nor negative, correct?

2007-04-01 05:38:40 · 6 answers · asked by Anonymous

2007-04-01 05:38:36 · 2 answers · asked by zltzmn 3

B. For example a wave measure 3 m in length with a period of 1/5 seconds. What is the wave speed?

2007-04-01 05:29:07 · 5 answers · asked by Johnnyboy 2