Physics - February 2007

2007-02-05 16:47:38 · 5 answers · asked by Anonymous

2007-02-05 16:47:01 · 6 answers · asked by bintu b 1

A 1300kg car pulls a 540kg trailer away from a stop light with an acceleration of 1.92 m/s2

a. What is the net force exerted by the car on the trailer in N?
b. What is the magnitude of the force that the trailer exerts on the car in N?
(c) What is the net force acting on the car in N?

A force of magnitude 8.11 N pushes 3 boxes with masses m1 = 1.30 kg, m2 = 3.20kg, and m3 = 4.90kg. Find the contact force between boxes 1 & 2, and between boxes 2 & 3.

Two crewmen pull a boat through a lock. One crewman pulls with a force of 130 N at an angle, θ = 35°, relative to the forward direction of the boat. The 2nd crewman, on the opp side of the lock, pulls at an angle of 45° degrees relative to the forward direction. With what force should the second crewman pull so that the net force of the two crewmen is in the forward direction?

A train is traveling up a 3.2 degree incline at 3.74 m/s when the last car breaks free starts to coast. How long does it take for the last car to come to rest?

2007-02-05 15:56:03 · 2 answers · asked by eureka4sureka 1

in equilibrium? Let w1 = 120 N and w2 = 59.0 N
b)What coefficient of static friction between the 120 N block and the table ensures equilibrium?
c)If the coefficient of kinetic friction between the 120 N block and the table is 0.295, what hanging weight should replace the 59.0 N weight to allow the system to move at a constant speed once it is set in motion?

Need help on this on guys, been working on for hours- thanks

2007-02-05 15:46:39 · 1 answers · asked by cosmo 1

2007-02-05 15:31:37 · 46 answers · asked by *Ruffian* 3

2007-02-05 15:19:33 · 1 answers · asked by JUDY T 3

People say that nothing else in the Universe can go faster than the speed of light, as the energy used would drastically increase to move something with mass that fast. But light has mass, so how come it can move that fast?

2007-02-05 15:14:30 · 6 answers · asked by The Prince 1

What is Plank's theory? What is Plank's constant h ? - from K N Swamy

2007-02-05 15:11:45 · 5 answers · asked by sweetvirgo58 1

What is the difference between Fission and Fusion? How are they alike? Please help

2007-02-05 15:09:56 · 4 answers · asked by ct7167tef 1

What is Plank's theory? What is Plank's constant h ? - from K N Swamy

2007-02-05 15:09:02 · 5 answers · asked by sweetvirgo58 1

A motorboat traveling a straight course slows uniformly from 60km/hr to 40km/hr in a distance of 50m. Whats the boats acceleration?

2007-02-05 15:00:09 · 2 answers · asked by Morena 1

2 runners approahing each other on a straight track have constant speeds of 4.50m/s and 3.50m/s, respectively, when they are 100m apart. How long will it take for the runners to meet, and at what position will they meet if they maintain these speeds?

2007-02-05 14:54:19 · 4 answers · asked by Morena 1

This problem is 5 parts, here is the background information:

A flea is at point "A" on a horizontal turntable that is 14.7 cm from the center. The Turntable is rotating at 32.5 rev / min in the counterclockwise direction. The flea jumps vertically upward to a height of 7.29 cm and lands on the turntable at point "B" . Place the coordiante origin at the center of the turntable with the positive x-axis fixed in space and initially passing through "A". The acceleration of gravity is 9.8 m/s^2.

A.) Find the linear displacement of the flea ( Answer in meters)

B.) Find the angle through which point A has rotated when the flea lands (Answer in degrees)

C.) Find the distance of point "B" from the origin when the flea lands (Answer in meters)

D.) What angle does the radius drawn through "B" make with the x-axis when the flea lands (Answer in degrees)

E.) What is the linear speed of the flea after it lands? (Answer in m/s)

2007-02-05 14:51:57 · 3 answers · asked by Anonymous

My mom thinks I have been aveing sex but I haven't what d oI do to convince her?

2007-02-05 14:36:56 · 4 answers · asked by Anonymous

In diving we rarely get vis better than 20m. What could be the max vis achievable in a low airrated body of pure (or close to pure) water?

2007-02-05 14:36:09 · 2 answers · asked by Anonymous

Specifically does it update the date and day on consumer bought atomic wrist watches ?...

2007-02-05 14:32:56 · 1 answers · asked by Wise Owl 2

(a) Determine the length of an open organ pipe that emits G# above middle C (415 Hz) when the temperature is 19°C.

2007-02-05 14:32:39 · 1 answers · asked by Anonymous

True or False? Given that two bodies interact via some force, the accelerations of these two bodies have the same magnitude but opposite directions. (Assume no other forces act on either body.)


and


According to Newton's 3rd law, the force on the (smaller) moon due to the (larger) earth is


a. greater in magnitude and antiparallel to the force on the earth due to the moon.


b. greater in magnitude and parallel to the force on the earth due to the moon.


c. equal in magnitude but antiparallel to the force on the earth due to the moon.


d. equal in magnitude and parallel to the force on the earth due to the moon.


e. smaller in magnitude and antiparallel to the force on the earth due to the moon.


f smaller in magnitude and parallel to the force on the earth due to the moon.

2007-02-05 14:26:47 · 3 answers · asked by M 1

A cable passes over a pulley. Because the cable grips the pulley and the pulley has zero mass, the tension in the cable is not the same on opposite sides of the pulley. Then force on one side is 167 N, and the force on the other side is 64 N. Assuming the pulley is a uniform disk of mass 1.56 kg and radius 0.334m, determine the magnitude of its angular acceleration.

2007-02-05 14:26:00 · 2 answers · asked by Anonymous

The A string on a string bass is tuned to vibrate at a fundamental frequency of 51.0 Hz. If the tension in the string were increased by a factor of 3, what would be the new fundamental frequency?

2007-02-05 14:24:28 · 1 answers · asked by Anonymous

A model airplane whose mass is 0.864 kg is tethered by a wire so that it flies in a circle with radius 24 m. The airplane engine provides a net thrust of 0.742 N perpendicular to the tethering wire.

a) Find the torque the net thrust produces about the center of the circle.

b) Find the angular acceleration of the airplane when it is in level flight.

c) Find the linear acceleration of the airplane tangent to its flight path

2007-02-05 14:23:24 · 2 answers · asked by Anonymous

Please me:

1. Real springs have mass. How will the true period and frequency differ from those given by the equations for a mass oscillating on the end of an idealized massless spring?

2. How could you double the maximum speed of a SHO (Simple Harmonic Oscillator)?

For these problems, please show and explain your work so that I can understand this topic in Physics better! Some answers from the back of the book are listed but I can't seem to get them right.

1. When a 65kg. person climbs into a 1000kg car, the car's springs compress vertically by 1.9 cm. What will be the frequency of vibration when the car hits a bump? Ignore damping.
(0.89 Hz)

2. A piece of rubber is 50 cm long when a weight of 35 N hangs from it & is 85 cm long when a weight of 70 N hangs from it. What is the "spring" constant of this piece of rubber?

3. If a particle undergoes SHM w/ amplitude .15m, what's the total distance it travels in 1 period.

2007-02-05 14:17:46 · 1 answers · asked by hdwong58 3

1) you are in a hot air balloon relative to the ground has a velocity of 6.0 m/s due east. you see a bird moving directly away from the balloon due north. The speed of the hawk relative to you is 2.0 m/s. What are the magnitude and direction of the hawks velocity relative to the ground?Express the angle relative to due east.

2)A golfer tees off and drives the ball 3.5 times as far as he would n earth, given the same initial velocities on both planets. The ball is launched at 45 m/s at an angle of 29 degrees above the horizotal. When the ball lands it is the same level as the tee. On the distance planet what are the aximum height and range of the ball?

i appreciate any help i can get, please show your work even if you can only help me with 1 of the 2 problems. thanks so much!

2007-02-05 14:16:22 · 1 answers · asked by wade 2

2007-02-05 14:11:04 · 14 answers · asked by Anonymous

You are in a hot-air balloon that, relative to the ground, has a velocity of 9.5 m/s in a direction due east. You see a hawk moving directly away from the balloon in a direction due north. The speed of the hawk relative to you is 2.9 m/s. What are the magnitude and direction of the hawk's velocity relative to the ground? Express the directional angle relative to due east.

2007-02-05 14:03:57 · 2 answers · asked by Anonymous

I've tried this problem but no success, can someone please explain? Thanks

For a movie scene, an 85.0 kg stunt double falls 12.0 m from a building onto a large inflated landing pad. After touching the landing pad surface, it takes her 0.486 s to come to a stop. What is the magnitude of the average net force on her as the landing pad stops her?

2007-02-05 13:37:21 · 2 answers · asked by oscarv_56 1

how do u find the amount of force I would need with each turn of the handle and total amount of force for a screw jack or jack screw to raise books at a distance of 20 cm?
pitch=2 cm.
books=10 kg
distance=20 cm.
force=circumference of about 150 cm.

to find input force- 10kg*20 cm./2*3.142*radius (75)
so that with be 200/471= 0.42

to find the total amount would be 471/0.42=1121.43

if i used the same about of books with a pulley system. which of the machines has a greater mechanical advantage?

pulley system would be ?

2007-02-05 13:23:09 · 1 answers · asked by ghettoco 1

2007-02-05 13:15:40 · 1 answers · asked by brian_rambadan 2

Three strings are tied together. They are on top of a circular table and meet exactly in the center of the table. Each of the strings hangs over the edge of the table, and a weight is supported from it as shown. The masses m1 = 3.70 kg and m2 = 6.60 kg are known. The angle α = 72.6 degrees between strings 1 and 2 is also known.

What is the angle β between strings 1 and 3?

Where do I start on this problem? What equations relate to a problem like this?

Thanks.

2007-02-05 13:11:11 · 2 answers · asked by Defcon6 2

For a movie scene, an 85.0 kg stunt double falls 12.0 m from a building onto a large inflated landing pad. After touching the landing pad surface, it takes her 0.486 s to come to a stop. What is the magnitude of the average net force on her as the landing pad stops her?

2007-02-05 13:06:47 · 1 answers · asked by oscarv_56 1