Physics - October 2007

a) insufficent information
b) the bug
c) both the same
d) the car

Please help! :)

2007-10-23 14:15:39 · 4 answers · asked by ~BuBbLy~ 1

2007-10-23 14:12:38 · 2 answers · asked by farnaz c 1

How do I find the current if the voltage is 6 volts, and there is no resistance?

I know how to find the current if there IS resistance, but I don't know how if there isn't any at all.

2007-10-23 14:00:15 · 4 answers · asked by Anonymous

if you put a damp paper towel on the end of a thermometer and fan it, and take a thermometer without anything and fan that too, which would be colder, the thermometer with or with out the damp paper towel? please, answer if you only know what your talking about. please don't guess.

2007-10-23 13:40:42 · 1 answers · asked by Jason 2

Given the following vectors:
A: Ax = 4 units, Ay = 3 units
B: Bx = 5 units, By = -3 units
C: Cx = -2 units, Cy = 1 unit

1) Find the directions and the magnitude of the vector A + B - C.

2) What vector do you need to add to the resultant vector A - B + C so that the sum of the vectors results in the null vector? Express it in terms of its direction and magnitude.

2007-10-23 12:22:59 · 1 answers · asked by Anonymous

why is it that fusion happens all the time on the sun but is very difficult and requires a huge amount of energy on the earth.

2007-10-23 12:06:00 · 6 answers · asked by Anonymous

A frictionless pulley (a solid cylinder) of unknown mass M and radius r = 0.41 m is used to draw water from a well. A bucket of mass m = 1.42 kg is attached to a cord wrapped around the cylinder. A bucket starts from rest at the top of the well and falls for t = 2.82 s before hitting the water h = 7.85 m below. Neglect the mass of the cord.
a) What is the linear acceleration a of the falling bucket?
b) What is the angular acceleration,a, of the rotating pulley?
c) What is the tension T force for the cord?
d) What is the value of the torque,T, that is applied to the pulley by the bucket hanging on the card?
e) Using the value of the torque and the angular acceleration, find the moment of inertia I of the rotating pulley
f) Using the moment of inertia, calculate the mass of the pulley, M
g) What is the linear velocity, v, of the falling bucket just before it hits the water?
h) What is the angular velocity, w, of the rotating pulley just before the falling bucket hits the water?

2007-10-23 12:01:34 · 1 answers · asked by Anonymous

Does the acceleration due to gravity increase as latitude increases?

2007-10-23 11:13:47 · 5 answers · asked by Anonymous

A baseball is thrown from the roof of a building of height 21.6 m with an initial velocity of magnitude 11.7 m/s and directed at an angle of 57.5 degrees above the horizontal.What is the speed of the ball just before it strikes the ground? Use energy methods and ignore air resistance.
Take free fall acceleration to be = 9.80 m/s^2 .

2007-10-23 10:57:08 · 3 answers · asked by Natiphy2007 1

each of which has a mass of 240 kg and can be approximated as a thin rod of length R = 6.2 m.

a) What is the total moment of inertia of the two blades about the axis of rotation?

(b) Determine the rotational kinetic energy of the spinning blades.

2007-10-23 10:39:28 · 4 answers · asked by Anonymous

im doing a science project and i need ideas for how to keep my egg from cracking when i drop it from the top of the football bleachers. any ideas as to what to do?

i can use any materials except glass and metal. and you cant coat the egg with anything.

2007-10-23 10:16:17 · 1 answers · asked by moose 1

1.A freight train has a mass of 2 107 kg. If the locomotive can exert a constant pull of 9 105 N, how long would it take to increase the speed of the train from rest to 85 km/h?
s


2.A 50 kg person escapes from a burning building by jumping from a window 50 m above a catching net. Assuming that air resistance exerts a 95 N force on the person during the fall, determine the person's velocity just before hitting the net.
m/s

2007-10-23 10:11:13 · 2 answers · asked by Anonymous

A single bead can slide with negligible friction on a wire that is bent into a circular loop of radius 15 cm. The circle is always in a verticle plane and rotates steadily about its vertical diameter. The position of the bead is described by the angle θ that the radial line, from the center of the loop to the bead, makes with the vertical. (the circle is rotating to the right)
If if the period of the rotation is .450 s, at what angle(s) up from the bottom of the circle can the bead stay motionless relative to the turning circle? (b) Repeat the problem taking the period of the circle's rotation as 0/850 s.

2007-10-23 10:10:43 · 2 answers · asked by klevix 2

How is acceleration a function of Force and Mass??




Thanks for the help!!!

2007-10-23 09:49:24 · 5 answers · asked by Anonymous

I think I've heard it somewhere but I am not sure if it is true. Does red color look white through a red prism? Maybe it applied only to a specific shade of red; I don't know. Does red ever look white?

2007-10-23 09:29:54 · 8 answers · asked by Lilly 2

1) A generator has a teminal voltage of 110 V when it delivers 11.4 A, and 93 V when it delivers 35.6 A.
calculate the emf. answer in units of V.




Thank you!

2007-10-23 09:22:27 · 2 answers · asked by Jack 1

2007-10-23 09:19:52 · 3 answers · asked by simple1_suraj 1

A potter's wheel with a moment of inertia of 8.0 kg.m^2 has 5.0 N.m applied to it. If it starts from rest, calculate (a) the wheel's angular velocity and (b) it's kinetic energy 10.0s later.

2007-10-23 08:52:15 · 1 answers · asked by Gary 2

I need help getting started on these 2 problems. (Step by step instructions will definitely earn you 10 points)

1. A company truck is on its way to deliver a birthday cake for a birthday party when it rounds a curve with a radius 20.0 m at a speed of 12 m/s. What coefficient of friction is needed between the cake pan and the truck in order to keep the pan from slipping?

2. Steve's car rounds an unbanked curve that has a radius of 100 m. If the coefficient of friction between the tires and the road is 0.40, what is the fasted speed the car can round the curve without risking an accident?

Thanks!
-willm16

2007-10-23 08:37:36 · 3 answers · asked by Anonymous

So my friend and I were driving along at 60 mph and right in front of us, was this fly, buzzing around our face. Now of course we were traveling at 60 mph because we were attached to the car, but the fly was not.

How is it possible for him to not be attached to anything, buzzing in our faces and flying in circles, but yet he is flying at 60 mph SOMEHOW.

Why isn't he smashed up against the back window?

2007-10-23 08:36:20 · 10 answers · asked by angelhaiku 5

If the forces equal zero, then dont the forces cancel each other out so therefore the object is not moving?

2007-10-23 08:27:09 · 6 answers · asked by Chrissy 2

Ok, so I have this ball that I have heated up that is made of an elastic material. Regardless of the material the ball is made of, im really just curious about the air inside it itself.
I understand the rise in temperature will increase the air pressure by giving the particles more kinetic energy thus increasing the force the air exerts on the ball's wall, but my question really is

"would the air pressure have a large enough effect on the rate that the ball changes shape from when it hits the ground to when it bounces back?"

i.e. would an increase in air pressure cause the ball to bounce higher?

Hope someone understands. :)

2007-10-23 08:26:49 · 5 answers · asked by saman-a-man 1

like as in dissolve and stuff? i kno its not supposed to, but like if it disolves from accid? does that work? and if they never "dissapear", then what if there is just too much matter?

2007-10-23 08:26:17 · 4 answers · asked by Anonymous

Every morning observers stationed on the Earth observe the Sun rise in the morning, move along arc of circle, and set in the evening. Apparantly the Sun is rotaing around the Earth at distance 1a.u. and period ~24 hours. The centripetal accleration of the Sun must be enormous. What is the force that causes the above described centripetal acceleration?

2007-10-23 08:25:02 · 10 answers · asked by Alexander 6

i need to find out how levers forces work

2007-10-23 08:21:35 · 2 answers · asked by mankeyboy555 1

A 3.00-kg object is moving in a plane, with its x and y coordinates given by x= 5t^2 – 1 and y = 3t^3 + 2, where x and y are in meters and t is in seconds.

2007-10-23 08:14:14 · 1 answers · asked by Soare 1

A rifle with a weight of 20 N fires a 4.5 g bullet with a speed of 210 m/s.
(a) Find the recoil speed of the rifle.
(b) If a 775 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle.

2007-10-23 08:12:04 · 2 answers · asked by Anonymous

All right, I don't even know where to start with this one. Do I use F = -kx? What formulas should I use after that, or at all? This is frustrating me.

"A 10.0 g bullet is fired horizontally into a 108 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 159 N/m. The bullet becomes embedded in the block. If the bullet-block system compresses the spring by a maximum of 72.0 cm, what was the speed of the bullet at impact with the block?"

I don't think I'm supposed to use F = -kx to find the speed of impact, as F = ma and I don't know the acceleration. This, to me, doesn't sound right. What do I do?

2007-10-23 07:50:40 · 4 answers · asked by justme 4

http://img221.imageshack.us/img221/8995/fzksmg3.jpg

2007-10-23 07:30:30 · 2 answers · asked by Ariel 2

The center of gravity of the car is between the front and rear tires, and the horizontal distance between the center of gravity and the front axle is 1.02 m.

(a) Determine the normal force that the ground applies to each of the two front wheels

(b) Determine the normal force that the ground applies to each of the two rear wheels.

2007-10-23 07:15:55 · 2 answers · asked by Anonymous