Physics - February 2007

1. W = 1.6 m

2. Weight is directly proportional to mass

3. W = 4.9 m

4. They are the same

5. W = 9.8 m

6. Weight is inversely proportional to mass.

7. None of these

2007-02-22 15:33:54 · 10 answers · asked by davi921 2

Can a body travelling at a speed of light or greater speed, overcome the time barrier?
meaning can it travell back an forth in time?

2007-02-22 15:23:50 · 7 answers · asked by Anonymous

2007-02-22 15:22:08 · 1 answers · asked by symperl 2

The difference in potential between the accelerating plates of a TV set is about 23 kV. The distance between these plates is 1.4 cm.
Find the magnitude ofthe uniform electric field in this region

2007-02-22 14:58:44 · 2 answers · asked by the poo goo 2

Two pellets each with a charge of 1 microcoulomb(10^-6 C) are located 3 cm(.03m) apart. What is the electric force between them? an object of what mass would experience this same force in the earths gravitational field?

2007-02-22 14:46:45 · 2 answers · asked by Anonymous

A satellite is placed in orbit 7.50 105 m above the surface of the planet Jupiter. Jupiter has a mass of 1.90 1027 kg and a radius of 7.14 107 m. Find the orbital speed of the satellite.

2007-02-22 14:42:39 · 2 answers · asked by vntraderus88 1

When one material is rubbed against another electrons jump readily from one to the other but the protons do not. Why is that

2007-02-22 14:32:44 · 5 answers · asked by Anonymous

What velocity is attained by an object which is accelerated at 0.30 m/s2 for a distance of 50. m with a starting velocity of 0.0 m/s?

ANS: 6 m/s.

How would you get to that answer??

2007-02-22 14:23:43 · 2 answers · asked by Anonymous

Looking for free online animated video(s) explaining what atoms are at the most elementary level...as though they are being explained to a child...or caveman. Animated would be best. Thanks

2007-02-22 14:17:39 · 2 answers · asked by World Expert 1

An athlete executing a long jump leaves the ground at a 20° angle and travels 5.80 m.
(a) What was the takeoff speed?
m/s
(b) If this speed were increased by just 5.0%, how much longer would the jump be?
m

2007-02-22 14:12:05 · 4 answers · asked by nafiseh g 1

A hunter aims directly at a target (on the same level) 110 m away.
(a) If the bullet leaves the gun at a speed of 240 m/s, by how much will it miss the target?
m
(b) At what angle should the gun be aimed so as to hit the target?
°

2007-02-22 14:11:05 · 2 answers · asked by nafiseh g 1

Two planes approach each other head-on. Each has a speed of 685 km/h, and they spot each other when they are initially 13.0 km apart. How much time do the pilots have to take evasive action?
s

2007-02-22 14:09:51 · 4 answers · asked by nafiseh g 1

1) A race car has a mass of 718 kg. It starts from rest and travels 44.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
N=?

2)Your mass is 80 kg. You stand on a bathroom scale in an elevator on Earth.

(a) What force would the scale exert when the elevator moves up at a constant speed?
N=?
(b) What force would the scale exert when it slows at 2.2 m/s2 while moving upward?
N=?
(c) What force would the scale exert when it speeds up at 2.2 m/s2 wile moving downward?
N=?
(d) What force would the scale exert when it moves downward at a constant speed?
N=?
(e) What force would the scale exert when it slows to a stop at a constant magnitude of acceleration?



3) A boy exerts a 38 N horizontal force as he pulls a 54 N sled across a cement sidewalk at constant speed. What is the coefficient of kinetic friction between the sidewalk and the metal sled runners? Ignore air resistance.

2007-02-22 14:07:40 · 1 answers · asked by mommy 3

2007-02-22 13:34:51 · 1 answers · asked by juliandbn 1

2007-02-22 13:33:59 · 2 answers · asked by juliandbn 1

2007-02-22 13:31:49 · 3 answers · asked by juliandbn 1

PLEASE HELP!!! HW due tomorrow

2007-02-22 13:31:17 · 2 answers · asked by Brittney M 1

2007-02-22 13:30:16 · 1 answers · asked by MOVED! 5

I need a site that would explain the 6 postulates as best and/or simply as possible. Something that a non-physics, non-mathematics major could understand.

2007-02-22 13:26:11 · 1 answers · asked by trafficer21 4

if you turn left, why would the glasses move right? Is it the gravitatonal force?

2007-02-22 13:21:10 · 5 answers · asked by Cynthia B 1

2007-02-22 13:14:14 · 6 answers · asked by Scott V 1

Here's the question:
A 0.075kg arrow is fired horizontally. The bowstring exerts an average force of 65N on the arrow over a distance of .90m. With what speed does the arrow leave the bow?

I'm not sure where to start... I thought I used the
equation 1/2(m)Vfinal^2 - 1/2(m)Vintial^2 but I dont know the final velocity.

2007-02-22 13:13:33 · 3 answers · asked by Anonymous

the transformer converts 120-V, household voltage, the step-down transformer. what is the current in the secondary coil when the lamb is on? what is the currnet in the primary coil? what is the resistance of the bulb when on?
please help!!

2007-02-22 13:12:54 · 3 answers · asked by Anonymous

2007-02-22 13:10:00 · 6 answers · asked by Green thinking 1

calculate the emf at the generator end of the lines and the fraction of the power generated that is wasted in the lines.

2007-02-22 13:08:26 · 1 answers · asked by Anonymous

Light of wavelenght 436nm in air enters a fishbowl filled with water, then exits through the crown-glass wall of the container. Find the wavelengh of the light in the water and in the glass.

2007-02-22 13:05:58 · 2 answers · asked by Kitana 2

does he have to exert any force to throw a bolling ball if the ball is also weightless? I can't get this. Any guesses?

2007-02-22 13:04:32 · 4 answers · asked by Cynthia B 1

Light is incident normally on a 1cm. layer of water that lies on top of a flat Lucite plate with a thickness of 0.5cm. How much more time is required for light to pass through this double layer than is required to traverse the same distance in air? ( n lucite is 1.59)

2. Find the speed of light in a. flint glass, water and zircon.

2007-02-22 13:02:16 · 1 answers · asked by Kitana 2

Please help me!!! HW

2007-02-22 12:59:19 · 3 answers · asked by Brittney M 1

At the top of the trajectory, the shell explodes into two fragments of equal mass (Fig. 9-38). One fragment, whose speed immediately after the explosion is zero, falls vertically. How far from the gun does the other fragment land, assuming that the terrain is level and that the air drag is negligible?

2007-02-22 12:56:39 · 1 answers · asked by Anonymous