Physics - October 2007

2007-10-02 20:37:37 · 12 answers · asked by albert o 1

the transistor is ideal

2007-10-02 20:37:07 · 1 answers · asked by coolbunty_87 1

workers are to install a hatch (door) near the bottom of an empty storage tank, in choosing how strong to make the hatch, does it matter how tall the tank it? how wide it is? whether it is going to hold watch or mercury?explain.

2007-10-02 20:36:50 · 2 answers · asked by corvetteracing 1

A 0.700 kg ball is on the end of a rope that is 3.50 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0° down to the right. What is the tangential speed of the ball?
____m/s

2007-10-02 20:31:48 · 1 answers · asked by Anonymous

Can anyone explain how projectile motion works. Give me some formulas. Some webpages also. Thanks.

2007-10-02 20:26:49 · 2 answers · asked by Adawg 3

A trimmer for cutting weeds and grass near trees and borders has a nylon cord of 0.25 m length that whirls about an axle at 670 rad/s. What is the linear speed of the tip of the nylon cord?

___m/s

2007-10-02 20:23:21 · 1 answers · asked by Anonymous

2007-10-02 20:06:29 · 3 answers · asked by Anonymous

A 1.0 kg ball hangs from the ceilimng of a truck by a 1.0m long string. The back of th etruck, where you are riding with the ball, has no window and is completely soundproof.truck travels along an exceeding smooth test track, and you feel no bumps or bounces as it moves. only instrument is the meter stick, a protractor and a stopwatch.
a. driver tells you that the truck is either at rest or moving forward at a sterady speed of 5m/s. can you deternmine which it is? if so how??
b.then the driver tells you that the truck is either moving forward at a steady speed of 5m/s or it is accelerating. can you det. which is it?
c.truck has been accelerating forwards at 5m/s^2 long enough for the ball to achieve a stead position. does the ball have an acceleration? if so, what are the magnitude and direction of the ball's accel?
d. FBD that shows all forces acting on the ball as the truck accelerates.
e. ball makes a 10degree angle with vertical. det truck's velocity/acceleration??

2007-10-02 19:54:05 · 2 answers · asked by berry 1

Is speaking a longitudinal wave or a transverse wave. Why is that so. Also does rarefaction have a minimum or maximum pressure variation and why?

Thanks

2007-10-02 19:00:12 · 1 answers · asked by Anonymous

Hello, I want to intensively use a fogmachine inside a room. will its chemicals harm the people insdie the room? just want to know
the kind of chemicals they use for this purpose.

2007-10-02 18:40:22 · 3 answers · asked by THOR 1

Well, aren't they? So if I have a big fluffy hat and a tennis ball that have the same mass, they have the same weight, right? Now I judge one to be heavier than the other...that has to do with pressure, right? I feel more or less pressure on a certain amount of area on my hand, and I judge one to be heavier than the other, correct? Or not?

2007-10-02 18:32:40 · 8 answers · asked by Burnt Toast 1

The coefficient of static friction between Teflon and scrambled egs is about 0.04 . What is the smallest angle from horizontal that will cause the eggs to slide across the bottom of a Teflon-coated skillet??????

2007-10-02 17:31:04 · 2 answers · asked by golffan137 3

A 0.700 kg ball is on the end of a rope that is 1.20 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0° with respect to the vertical. What is the tangential speed of the ball?

2007-10-02 16:34:15 · 2 answers · asked by Anonymous

2007-10-02 16:08:06 · 6 answers · asked by archywind 2

the answer is either _ _ _ A _ _ or _ _ _ _ A _ _

2007-10-02 16:05:53 · 1 answers · asked by jasperapi 1

Two packing crates of masses m1 = 10.0 kg and m2 = 5.00 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 5.00 kg crate lies on a smooth incline of angle 41.0°. Find the acceleration of the 5.00 kg crate.

______ m/s2 (up the incline)

Find the tension in the string.
______ N

need a detailed way to solve the problem, not just the answer...thank you sooo much

2007-10-02 15:58:50 · 1 answers · asked by lttlstar7 1

2007-10-02 15:50:27 · 1 answers · asked by taj6900 1

A long, straight wire carries a current of 60 A. The magnetic field produced by this current at a certain point is 8.5 x 10^-5 T. How far is the point from the wire?

2007-10-02 15:49:58 · 1 answers · asked by Anonymous

A river flows due south with a speed of 1.6 m/s. A man steers a motorboat across the river; his velocity relative to the water is 4.7 m/s due east. The river is 650 m wide.

What is the magnitude of his velocity relative to the earth?
What is the direction of his velocity relative to the earth?
How much time is required to cross the river?
How far south of his starting point will he reach the opposite bank?

2007-10-02 15:48:38 · 1 answers · asked by Anonymous

An airplane is flying with a velocity of 92.0 m/s at an angle of 21.0 degrees above the horizontal. When the plane is a distance 118 m directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.

How far from the dog will the suitcase land? You can ignore air resistance.

2007-10-02 15:46:45 · 1 answers · asked by Anonymous

An ant walks away from the top of a ball. If the ant starts to slip when the normal force on its feet drops below one-half its weight, at what angle does slipping begin?

Note: No frictional forces
I understand that N=1/2m in the equation N=mg, therefore 1/2m=mg and 1/2=g , but I do not know how to solve from there.

2007-10-02 15:34:50 · 3 answers · asked by dogbitte 2

Given: The energy equivalent of one gallon of gasoline is 1.3 x 10^8 J. A compact car has a mass of 751 kg and its efficiency is rated at 15.8%. (That is 15.8% of the input power available is delivered to the wheels). Find the amount of gasoline used to accelerate the car from rest to 26.7 m/s. Answer in units of gal.

2007-10-02 15:32:13 · 1 answers · asked by natty 1

A driver of a car traveling at 15.0 m/s applies the brakes, causing a uniform acceleration of -2.0 m/s^2. How long does it take the car to accelerate to a final speed of 10.0 m/s? How far has the car moved during the braking period?

the textbook has the equation to get the Time but i need the Displacement (how far)...but to get the Displacement i need the Time. anyone help me please??

2007-10-02 15:20:28 · 4 answers · asked by Anonymous

The following equation is for the next question.
t½ = τ ln2 = RC ln2

--------------------------------------------------------------------------------
2. Given a resistance of 101 Ohms and a capacitance of 190micro Farads,
what is t½?
t½ = ______________seconds.
(Hint: There are 106 micro Farads in one Farad. So the capacitance is 0.00019 Farads.
(Answer with three significant figures (in seconds) or N/A if there is no answer.)

2007-10-02 14:57:09 · 1 answers · asked by Anonymous

two charged pith balls are suspended on very light 10cm strings. Each has a mass of 30g. In equilibrium, the total angle between the strings is 60 degrees. Assuming the pith balls are equally charged, what is the charge on each ball?

2007-10-02 14:49:05 · 1 answers · asked by Anonymous

which is closer to the bristles end than the handle end. If you saw the broom in 2 pieces at that point & weigh the 2 parts on the scale, you'll find that the heavier part is the:
a) both are the same
b) handle part
c) bristles part

I think the answer is C) the bristles part. Am I right?

2007-10-02 14:42:29 · 5 answers · asked by AnonymousOne 2

I know the conversion factor is ≈ 3.33564×10^−10, but how do you derive the conversion factor?

2007-10-02 14:19:35 · 3 answers · asked by Anonymous

what happens to the momentum that he lost ?

2007-10-02 13:50:32 · 1 answers · asked by werewulf2000 2

A 250 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.800, and the log has an acceleration of 0.700 m/s2. Find the tension in the rope

2007-10-02 13:46:47 · 1 answers · asked by Anonymous

This is a HS physics class, so its not going to be very hard.


A 0.18 kg ball is places on a compressed spring on the floor. The spring exerts an average force of 2.8 N through a distance of 15 cm as it shoots the ball upward. How high will the ball travel above the release spring?

Thanks!

2007-10-02 13:46:04 · 2 answers · asked by just me. 2