Physics - March 2007

Hi, i really need help with one of my physics problems. It asks what parts of a bicycle are torqued, name 4 parts. Can any one help me please?

2007-03-07 14:38:38 · 1 answers · asked by nnaeem52 1

A)the same direction as the current
B)a clockwise direction
C)the direction opposite to the current
D)a counterclockwise direction

2007-03-07 14:30:27 · 4 answers · asked by Allison D 1

2007-03-07 14:24:14 · 11 answers · asked by Anonymous

i have trouble with physics homework. help would be nice. and also how many images do you see when two mirros are at right angle. what happens when angle changes?

2007-03-07 14:24:01 · 2 answers · asked by Anonymous

A) intermittent direct
B) intermitttent alternating
C) continous direct
D) continous alternating

2007-03-07 14:19:33 · 3 answers · asked by Allison D 1

2007-03-07 14:19:07 · 2 answers · asked by mohan 1

Please explain how you come to the conclusion because I really need to know this stuff.
Thanks in advance.

A snowboard starts at rest and slides down a 15 degree incline that is 60 m long. The coefficient of friction is 0.090. Use energy methods to solve problems.

A. What is the snowboard's speed at the base of the incline?


B. If the snow is level at the base of the incline and has the same coefficient of friction, how far will the snowboard travel along the level ground?

2007-03-07 14:13:39 · 1 answers · asked by CJT 3

Where from the electrons get energy to revolve around the proton. Is there any lose of energy occurs then how it is compensated?

2007-03-07 13:56:28 · 8 answers · asked by Secretary, Consumer Movement 2

2007-03-07 13:52:59 · 1 answers · asked by ivybrr 1

2007-03-07 13:44:13 · 7 answers · asked by Anonymous

How much tension must a rope withstand if it is used to accelerate a 1046 kg car horizontally along a frictionless surface at 1.21 m/s2?

Any help would be greatly appreciated!

2007-03-07 13:43:45 · 3 answers · asked by Jessie L 2

So let's say we have a step up transformer. It is going to increase the voltage and energy is conserved therefore current will decrease in wire. But what I dont get is, how is that going to save the power loss?? Power = I^2 *R so if current decreases in the wires power loss also decreases. OK. But Power also equals V^2/R so when V increases power loss increases?? I am so confused!!!

2007-03-07 13:30:10 · 2 answers · asked by Just livin my life 2

An electron at point A in the figure View Figure has a speed of 1.48×10^6 m/s Find the magnitude of the magnetic field that will cause the electron to follow the semicircular path from A to B . This is the link to the picture http://session.masteringcollegephysics.com/problemAsset/1020007/3/20P18.jpg

I've tried using the equation R=(m*v)/(q *B) solving for B but it doesnt work i get the wrong answer 1.68×10^−6 using the mass of the electron 9.10938*10^-31 and its charge 1.602*10^-19 and radius 5 any ideas of what im doing wrong and what should i do? thanks.

2007-03-07 13:23:50 · 1 answers · asked by Anonymous

a woman of mass 65kg is trying to rescue a man of mass 80kg who has fallen over the cliff's edge. The woman is standing on a horizontal frictionless surface 15 metres from the edge of the cliff. dtermine how long it will take before the woman reaches the edge of the cliff, starting from rest
the answer is 2.4 seconds

thanks!!

2007-03-07 13:15:54 · 1 answers · asked by Anonymous

The period of the leg can be approximated by treating the leg as a physical pendulum, with a period of 2pi*sq rt(I / mgh), where I is the moment of inertia, m is the mass, and h is the distance from the pivot point to the center of mass. The leg can be considered to be a right cylinder of constant density. For a man, the leg constitutes 16 \% of his total mass and 48 \% of his total height.

Find the period of the leg of a man who is 1.81 m in height with a mass of 75 kg. The moment of inertia of a cylinder rotating about a perpendicular axis at one end is m*(l^2) / 3

2007-03-07 13:04:43 · 1 answers · asked by Anonymous

An arrow is shot at 30.0 degrees above the horizontal. Its velocity is 49 m/s, and it hits the target.

a. What is the maximum height the arrow will attain?

b. The target is at the height from which the arrow was shot. How far away is it?

2007-03-07 12:55:50 · 2 answers · asked by jenergizer303 1

mangetic force on a current-carrying wire F = BILsinθ
magnetic force on a moving charge F = BQvsinθ
what is the relationship between the 2 equations?
i mean how to derive 1 equation from the other & vice versa
hope sb can answer it~~ thx a lot

2007-03-07 12:43:12 · 1 answers · asked by alee a 1

which has more volume? a kg of gold or a kg of aluminum? please explain in physics terms

2007-03-07 12:41:50 · 11 answers · asked by questionhere 2

A 36.0- resistor and an 20.0- resistor are connected in series across a 15.0-V battery. What is the voltage across
(a) the 36.0- resistor and (b) the 20.0- resistor?

2007-03-07 12:00:13 · 2 answers · asked by madison c 1

Superwoman is hovering above the ground when a person free-falling goes by her at a terminal velocity of 140 km/h. Unfortunately, the parachute does not open. Fortunately, Superwoman is around. If it takes her 1.9 s to realize the person is in distress, what must her acceleration be if she is to catch the parachutist just before she hits the ground 1000 m below?

2007-03-07 11:56:44 · 3 answers · asked by Chess 2

In doing a load of clothes, a clothes drier uses 18 A of current at 240 V for 33 min. A personal computer, in contrast, uses 2.7 A of current at 120 V. With the energy used by the clothes drier, how long (in hours) could you use this computer to "surf" the internet?

2007-03-07 11:55:22 · 1 answers · asked by madison c 1

A cylindrical copper cable carries a current of 1160 A. There is a potential difference of 1.6 10-2 V between two points on the cable that are 0.39 m apart. What is the radius of the cable?

2007-03-07 11:52:17 · 1 answers · asked by madison c 1

High-voltage power lines are a familiar sight throughout the country. The aluminum wire used for some of these lines has a cross-sectional area of 4.9 10-4 m2. What is the resistance of ten kilometers of this wire?

2007-03-07 11:49:59 · 1 answers · asked by madison c 1

The resistance of a bagel toaster is 18 . To prepare a bagel, the toaster is operated for one minute from a 120-V outlet. How much energy is delivered to the toaster?

2007-03-07 11:47:38 · 1 answers · asked by madison c 1

2007-03-07 10:52:29 · 4 answers · asked by bettygirl 1

2007-03-07 10:42:36 · 16 answers · asked by Anonymous

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. Only 65% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. No light passes through the second sheet. What angle does the transmission axis of the second sheet make with the vertical?

2007-03-07 10:39:33 · 1 answers · asked by help! 1

2007-03-07 10:32:29 · 3 answers · asked by R C 2

During a 56 ms interval, a change in the current in a primary coil occurs. This change leads to the appearance of a 6.0 mA current in a nearby secondary coil. The secondary coil is part of a circuit in which the resistance is 12 . The mutual inductance between the two coils is 4.1 mH. What is the magnitude of the change in the primary current?

2007-03-07 10:26:40 · 1 answers · asked by layc_510 2

a woman of mass 65kg is trying to rescue a man of mass 80kg who has fallen over the cliff's edge. The woman is standing on a horizontal frictionless surface 15 metres from the edge of the cliff. dtermine how long it will take before the woman reaches the edge of the cliff, starting from rest
the answer is 2.4 seconds

thanks!!

2007-03-07 10:20:08 · 2 answers · asked by Anonymous