Physics - December 2007

2007-12-13 08:44:09 · 4 answers · asked by cobra69 1

Calculate the power developed by the tractor.

2007-12-13 08:08:29 · 2 answers · asked by Anonymous

Calculate the work done on the mass.
Calculate the power developed.

2007-12-13 08:04:56 · 3 answers · asked by Anonymous

How much work is needed to move a 150 kg refrigerator to the 3rd floor

2007-12-13 07:57:42 · 3 answers · asked by Anonymous

Which person does more work? Which person produces more power?

2007-12-13 07:54:48 · 2 answers · asked by Anonymous

what is the max height reached by the projectile and how long will it stay in the air

2007-12-13 07:51:08 · 1 answers · asked by MeDIGURU 1

Hey, I need help with 2 problems. The teacher does not teach very well and basically I am trying to learn off the book which is very hard to comprehend. Thanks for your help.

1. An object is hung from a spring balance attached to the ceiling of an elevator. The balance reads F1 = 12N when the elevator is accelerating upward, and reads F2 = 8N when it is accelerating downward with acceleration of the same magnitude a. Find the mass of this object and magnitude of acceleration a. We assume that gravitational acceleration g i known.

2. Darlene the daring, a famous western stuntwoman, is being dragged along the ground by a rope tied to a horse. If her coefficient of kinetic friction with the ground is 1.3 and her mass is 60kg, how much force must the horse pull with to keep her at a constant speed?

2007-12-13 07:44:25 · 5 answers · asked by Karl 1

I know the nucleus splits, and releases neutrons, but what elements are created from the split?

2007-12-13 07:41:44 · 3 answers · asked by iamblagged 2

1. An elevator has a mass of 1400kg. What is the tension in the supporting cable when the elevator traveling down at 10m/s is brought to test in a distance of 40m. (Assume a constant acceleration.)

2. A jet airplane accelerates on the runway at 3.0. It has two engines which exert a total thrust of 3.0 x 10 ^ 5 N. What is the mass of this airplane?

3. Many people are familiar with the face that a rifle recoils when fired. This recoil is the result of action-reaction force pairs. A gunpowerder explosion creates hot gases which expand outward allowing the rifle to push forward on the bullet. Consistent with Newton's third law of motion, the bullet pushes backwards upon the rifle. What is the acceleration of the bullet relative to the recoil of the gun?

2007-12-13 07:38:17 · 1 answers · asked by Karl 1

2007-12-13 07:37:07 · 2 answers · asked by pyromaniac2617 2

2007-12-13 07:17:39 · 5 answers · asked by MeDIGURU 1

This may be more of a philosophical question, but I was wondering why the speed of light is what it is. What is it in our universe that makes light travel at this exact speed? Instead of 299,792,458 metres per second, why isn't it 300,000,000 metres per second, or 300,000,001 metres per second?

Is it strange that I find it a bit absurd that there's this mysterious number that defines the maximum speed a massless particle can attain in this universe?

2007-12-13 07:13:56 · 12 answers · asked by Mike 2

2007-12-13 06:59:57 · 6 answers · asked by Kinloch K 1

how can i calculate the effects of newton's cradle using a mathematical formula, showing the balance of momentum and energy conservation on both sides of the equation???

2007-12-13 06:56:38 · 1 answers · asked by Marcus 1

I want to learn because I cannot pass through a wall.
Θέλω να μάθω γιατί δεν μπορώ να περάσω μέσα από έναν τοίχο.

2007-12-13 06:55:18 · 4 answers · asked by bmplefour135 2

1: A bolt on a car engine is to be tightened with a torque of 35 Newton meters. If you have a 25 cm long wrench, what force should you exert?
1.4 N
1.4 x 102 N
8.8 N
8.8 x 10-1 N


2: Two disks have the same mass, but one (designated as D) has twice the diameter of the other (designated as d). Which would be harder to start rotating?
D
d
They are equally hard to rotate
Not enough information given


3: Angular acceleration is the rate of change of:
Linear displacement
Angular displacement
Linear velocity
Angular velocity


4: What is the angular velocity in rad/sec of the tip of a second hand of a watch?
1 rad/sec
6 rad/s
0.60 rad/sec
0.10 rad/sec


5: The direction of the rotation of a spinning object can be changed only by applying a(n) ______.
Force
Torque
Velocity
None of the Above


6: To relate the Angular momentum of a particle with its linear momentum, you need the particle’s:
Displacement from the origin
Distance from the origin
Velocity vector
Torque


7: Mass is an analogous linear quantity to the angular form of:
Weight
Torque
Inertia
Acceleration


8: As a gyroscope slows down due to friction, the rate of precession increases due to:
The direct relationship between angular momentum and precession
The inverse relationship between inertia and angular acceleration
The direct relationship between torque and angular acceleration
The inverse relationship between angular momentum and precession


9: The heavy rim around a Frisbee is useful because it gives it:
A large moment of inertia
A small moment of inertia
A decrease in the gyroscopic effect
An increase in it’s precession


10: An object moving in a circle at constant speed has:
No acceleration
Acceleration tangent to the circle
Acceleration towards the center of the circle
Acceleration away from the center of the circle

2007-12-13 06:50:35 · 2 answers · asked by Anonymous

You know, when it's the winter, you're outside, it's cold, and you decide you want to plant one on the flag pole in the front yard (when no ones looking, of course)?

2007-12-13 06:36:04 · 5 answers · asked by Anonymous

How many excess electrons does this person get?
By how much does her mass increase?

2007-12-13 06:31:30 · 1 answers · asked by Dan 1

2007-12-13 06:14:26 · 4 answers · asked by Anonymous

2007-12-13 05:45:40 · 3 answers · asked by bleech1 2

http://i4.photobucket.com/albums/y111/ygolordned/physics.jpg

2007-12-13 04:30:19 · 5 answers · asked by ygolordned 1

2007-12-13 04:20:33 · 7 answers · asked by Shehzaad 2

physics

2007-12-13 03:55:47 · 6 answers · asked by Anonymous

I know the classic definition, but can somebody give me a real-life application of the principle. Thanx!

2007-12-13 03:28:55 · 3 answers · asked by Anonymous

Click on the link below to see the video

http://www.youtube.com/watch?v=hPTxemolxB4

2007-12-13 02:48:37 · 7 answers · asked by Anonymous

2007-12-13 01:23:27 · 5 answers · asked by bimmi2111 1

A 1.60 102-kg piano is being lifted at a steady speed from ground level straight up to an apartment 18.0 m above the ground. The crane that is doing the lifting produces a steady power of 4.00 102 W. How much time does it take to lift the piano?

2007-12-13 01:20:29 · 5 answers · asked by Anonymous

A person is making homemade ice cream. She exerts a force of magnitude 20 N on the free end of the crank handle, and this end moves in a circular path of radius 0.32 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 1.8 s, what is the average power being expended?

2007-12-13 01:18:29 · 1 answers · asked by Anonymous

In an action-adventure movie, the hero lifts the 91-kg villain straight upward through a distance of 2.0 m in 0.55 s at a constant speed. What power does the hero produce while doing this?

2007-12-13 01:17:30 · 3 answers · asked by Anonymous

2007-12-13 01:07:32 · 1 answers · asked by chatter p 1