Physics - November 2007

What is the wavelength of a wave whose speed and period are 76 m/s and 5.12 ms, respectively? answer in meters

2007-11-13 05:02:48 · 1 answers · asked by Jerry M 1

Bruce stands on a bank beside a pond, grasps the end of a 10.0 m long rope attached to a nearby tree and swings out to drop into the water. If the rope starts at an angle of 38.0° with the vertical, what is Bruce's speed at the bottom of the swing?
____m/s

My biggest problem is I dont understand what 38.0degrees with the vertical means

2007-11-13 04:53:58 · 1 answers · asked by ? 2

A plane weighing 220 kN (25 tons) lands on an aircraft carrier. The plane is moving horizontally at 64 m/s (143 mi/h) when its tailhook grabs hold of the arresting cables. The cables bring the plane to a stop in a distance of 87 m.

(a) How much work is done on the plane by the arresting cables? (in MJ)
I have gotten the answer 45.9755...
that is NOT correct! any help??

2007-11-13 04:31:57 · 1 answers · asked by ? 2

A cyclist starts frm rest and freewheels down a hill inclined arcsin 1/20 to the horizontal . After traveling 80m the road becomes horizontal and the cyclist travels another 80m before coming to rest without using his brakes. Given that the combined mass of the cyclist and his machine is 80kg, model the cyclist and his machine as a single particle and hence find the resistive force, assumed constant throughtout the motion.

could you explain the steps please...thnxs...

2007-11-13 04:04:49 · 1 answers · asked by clueless 1

Two balls, of masses Ma=0.036kg and Mb=0.06kg are suspended on 0.3m strings next to each other. The lighter ball is pulled away to a 60degree angle wiht the vertical and released. WHat is the velocity of the lighter ball before impact? What is the velocity of each ball after the elastic collision? What will be the maximum height of each ball(above the collision point) after the elastic collision?

2007-11-13 03:49:14 · 3 answers · asked by stormin 1

.......... When its speed is 15 m/s, how far has it traveled?

2007-11-13 02:15:59 · 3 answers · asked by Rele007 1

What is the maximum load that could be suspended from a copper wire of length 1.8 m and radius 1.2 mm without breaking the wire? Copper has an elastic limit of 2.0 x 10^8 Pa and a tensile strength of 4.5 x 10^8 Pa.
N

2007-11-13 01:00:54 · 2 answers · asked by colin.muller 1

A hair breaks under a tension of 1.2 N. What is the diameter of the hair? The tensile strength is 2.2 x 10^8 Pa.
m

2007-11-13 01:00:06 · 1 answers · asked by colin.muller 1

the next question is 2.) Suppose the engines are fired to make the spacecraft go faster. Which path illustrate it? please help me..this is all about curvilinear motion

2007-11-12 23:26:28 · 1 answers · asked by sanaf 1

pls answer my question..thanks

2007-11-12 21:46:42 · 10 answers · asked by Anonymous

why do passengers tend to get thrown to one side when car turns around a corner at a fast speed?

2007-11-12 20:38:52 · 5 answers · asked by agnes_peres 1

I am in need for velocity laws (equations), please write it down for me.
Thanks in advance.

2007-11-12 19:46:45 · 5 answers · asked by momet j 1

dont come up with solar system, galaxy, space etc...
need to know much more higher.

2007-11-12 19:17:10 · 13 answers · asked by Anonymous

this software maybe usefull for translate physics books because when you translating you need to write physics caracters.

2007-11-12 19:04:03 · 2 answers · asked by salar_toti 1

2007-11-12 17:34:56 · 5 answers · asked by Anonymous

It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.08 m/s.

2007-11-12 16:37:44 · 2 answers · asked by r chris 2

A 59 kg swimmer jumps off a 9 m tower so....

Find the swimmer's velocity when hitting the water.

The swimmer comes to a stop 2 m below the surface. Find the net force exerted by the water.

2007-11-12 16:32:20 · 1 answers · asked by soccerlover39 1

The theory of special relativity states that an observer experiences the same speed of light no matter what speed he and his origin of light are traveling relative to each other.

2007-11-12 16:32:03 · 2 answers · asked by Rockstar 6

2007-11-12 15:46:42 · 6 answers · asked by kiwi 1

A) An electric ceiling fan with blades of diameter 0.800 m is rotating about a fixed axis with an initial angular velocity of 0.300 rev/s. The angular acceleration is 0.914 rev/s^2.Compute the angular velocity after a time of 0.190 .
B) Through how many revolutions has the blade turned in this time interval?
C) What is the tangential speed of a point on the tip of the blade at time T= 0.190 s?
D) What is the magnitude of the resultant acceleration of a point on the tip of the blade at time t = 0.190s ?

2007-11-12 15:31:28 · 2 answers · asked by Natiphy2007 1

momentum

QUESTION: Consider a system of two balls. Ball "A" has a mass of 9.2 kg and ball "B" has a mass of 7.5 kg. Ball "A" is going +15 m/s when it strikes ball "B" which is at rest. After the collision what is ball "Bs" velocity if ball " A" is moving with a velocity of 3.8 m/s

ANSWER: 14 m/s
( i know the answer because the teacher told us but i dont know how to do it, thanks for the help!)

2007-11-12 15:30:19 · 3 answers · asked by tina 2

how much work does the escalator do to move 1.0(mu)C of charge from the negative terminal to the positive terminal of a 1.5 V battery.

2007-11-12 15:25:13 · 3 answers · asked by biscuits 2

please help me with my homework!?!?

2007-11-12 15:18:27 · 8 answers · asked by candybar1234 2

help with homework please i cannot find it in my textbook.

2007-11-12 15:15:48 · 4 answers · asked by candybar1234 2

Given: Two chairs--> Silicon (lower specific heat) and Alumninum (higher specific heat)

Which would you more likely sit upon while wearing shorts in the hot sun? And why?

2007-11-12 15:14:37 · 1 answers · asked by Anonymous

a 105 kg football player running due north at a speed of 9.5 m/s is tackled by an 80 kg player running in a direction 150 degrees east of north at a speed of 9 m/s. The collision occurs on wet Astroturf (astro-glass)so you can ignore friction.

a.) In what direction do the entangles players move after the collision?

b.) At what speed do they move after the collision?

Please give explainations for your answers. Thanks.

2007-11-12 15:14:27 · 1 answers · asked by chellysea33 2

1) A bob of mass 120 g is hanging from a string of length 25 cm. What is the period of the pendulum?
2) If you wanted to double period of the pendulum, what should you do?
A) Quadruple the length of the string.
B) Double the length of the string.
C) Double the mass.
D) Halve the length of the string.
3) Consider the equation for the period of a pendulum. In a plot of T2 vs. l you will get a straight line. The slope of the line is given by
A) 4pi2/g
B) g1/2
C) 2pig1/2
D) 2pi/g
4-) All clocks used to keep time by the swinging of a pendulum which had a period of 1 second. If one of these clocks were taken to the moon, how would the time kept by the clock change?
A) The moon clock would run slower than the earth clock.
B) The moon clock would run faster than the earth clock.
C) It would depend on spring constant of the pendulum.
D) The moon clock would keep the same time as the earth clock.

2007-11-12 15:11:05 · 2 answers · asked by Natiphy2007 1

you are pulling a 10 pound kayak over ice. you are exerting 2 pounds of force on the rope that you are pulling connected to the front of the kayak, the angle of the rope to the horizontal is 25 degrees... how would you determine the coefficient of friction here and what is it?

Best Answer to first correct response

2007-11-12 15:07:09 · 2 answers · asked by Anonymous

A weather balloon is designed to expand to a maximum radius of 20 m at its working altitude, where the air pressure is .030 atm and the temperature is 200 K. If the balloon is filled at atmospheric pressure and 300 K, what is its radius at liftoff?
All I have is PV=nRT and I really don't know where to go with that...

2007-11-12 14:44:48 · 4 answers · asked by Anonymous

a) the wavelength of the sound

b) the pitch of the sound

c) the amplitude of the waves

d) the medium

2007-11-12 14:44:42 · 1 answers · asked by XOXO 1