Physics - October 2007

2007-10-01 10:30:13 · 4 answers · asked by Anonymous

-a 5.00 kg block rests on a horizontal plane. a force of 10.0 N applied horizontally causes the block to move horizonatally at constant velocity. what is the coefficient of kinetic friction between the block and the plane? assume g=9.80 m/s^2
please explain how you got this if you could:)

2007-10-01 10:23:19 · 1 answers · asked by nicki s 1

supppose a block of mass 25.0 kg rests on a horizontal plane, and the coefficient of static friction between the surfaces is .220, -what is the max possible static frictional force that could act on the block?___N? -What is the actual static frictional force that acts on the block if an external force of 25.0 N acts horizontally on the block?____N.: please explain how you did these if you could:)

2007-10-01 10:19:38 · 2 answers · asked by nicki s 1

plzz help!!!!!!!!!!!!!!!

2007-10-01 10:18:42 · 1 answers · asked by kitkat 3

You place a 7.50 kg tv on a spring scale. If the scale reads 78.4N, what is the acceleration due to gravity at that location?

Like what equation do you use?

2007-10-01 10:08:12 · 5 answers · asked by Katie E 2

2007-10-01 09:17:41 · 7 answers · asked by shadonox 1

2007-10-01 09:15:15 · 3 answers · asked by Anonymous

2007-10-01 08:46:19 · 1 answers · asked by TheElite 3

An 70.0-N crate of apples sits at rest on a ramp that runs from the ground to the bed of a truck. The ramp is inclined at 20.0°to the ground.

(a) The interaction partner of this normal force has what magnitude and direction?
Magnitude ____ N
Direction ___° below the horizontal

(b) What is the static frictional force exerted on the crate by the ramp?
___N

(c) What is the minimum possible value of the coefficient of static friction? ____

(d) The normal and frictional forces are perpendicular components of the contact force exerted on the crate by the ramp. What is the magnitude and direction of the contact force?
Magnitude ____N
Direction ___° above the horizontal

2007-10-01 08:33:15 · 1 answers · asked by Anonymous

Hi i cant say am much of a physics person, can you suggest one question i could plan to investigate about the move of objects on ramps?
I have to also give one factor i could change as i carry out investigation
One factor to measure, what i would use to measure and one factor to keep same to keep it fair...

I was thinking "does the shape of an obj effect its movement on ramp", could change obj shape, would measure time taken to travel down ramp, eqpt would be stopwatch and factor to keep same angle of ramp...

does this seem right?

2007-10-01 08:32:48 · 3 answers · asked by windwalker296 1

Hi Friends. i really Need This answer. i'm student and i have to use this formola (PV=nRT) In My Life. I mean my teacher Asked Me To Find An Example Of Using This Formola In My Daily Life. I have found 2 examples But They Are Not available Cause The Others Told That Before, If Some One Could Answer Me I Really Enjoy And Happy And Sure He Or She Are My Best Answer. Thanx

ZEROX
HomeHacker Security Team

2007-10-01 07:52:35 · 3 answers · asked by Anonymous

You drive a car 8h at 50 km/h, then 8h at 68km/h.

What is your average velocity? Answer in units of km/h.

2007-10-01 07:39:13 · 5 answers · asked by Anonymous

A freight train has a mass of 1.0 107 kg. If the locomotive can exert a constant pull of 7.0 105 N, how long does it take to increase the speed of the train from rest to 78 km/h?

2007-10-01 07:34:21 · 2 answers · asked by Foxychick 1

In an automatic clothes drier, a hollow cylinder moves the clothes on a vertical circle (radius r = 0.29 m), as the drawing shows. The appliance is designed so that the clothes tumble gently as they dry. This means that when a piece of clothing reaches an angle of above the horizontal, it loses contact with the wall of the cylinder and falls onto the clothes below. How many revolutions per second should the cylinder make in order that the clothes lose contact with the wall when = 67.0°?

ok I used the formula tan(67)=v^2/(0.29(9.8))

so i get V= 2.59 and then I divide it by 2piR, but i get the wrong answer. what am i doing wrong?

2007-10-01 07:30:44 · 1 answers · asked by yefimthegreat 1

In designing rotating space stations to provide for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the negative effects of motion sickness begin to appear when the rotational motion is faster than approximately 2.1 revolutions per minute. On the other hand, the magnitude of the centripetal acceleration at the astronauts' feet should equal the magnitude of the acceleration due to gravity on earth. Thus, to eliminate the difficulties with motion sickness, designers must choose the distance between the astronaut's feet and the axis about which the space station rotates to be greater than a certain minimum value. What is this minimum value?

2007-10-01 07:23:00 · 2 answers · asked by yefimthegreat 1

I don't know the terms in english but I'll try to explain though....

The information is:
The corp's weight(m)=0.01 Kg
The distance of the corp's oscillation(not the full distance)(Y)=1/2 of the full distance which the corp could reach during the oscillation
Corp's speed(v)=0.17/s
Acceleration(a)=0.07m/s^2

- Whch is the frequency(F)?
- Which is the full distance(A) which the corp reaches during it's oscillation?

thanks ;)

2007-10-01 07:20:56 · 1 answers · asked by Anonymous

my teacher in physics demonstrated polarization by combing her hair and small pieces of papers were magnetized by the comb. she said that when you do it, the electrons from the hair were transferred to the comb and the comb becomes negatively charged. (or is it the other way around? the comb is the positively charged) anyway,
i remember my chemistry teacher saying the removal of an electron is called ionization. is there ionization happening when you brush the hair with a comb?

2007-10-01 07:17:07 · 2 answers · asked by ace_3nidad 2

As the car passes over the top of a circular hill of radius 20 m, its speed is not changing.
(a) What are the magnitude and direction of the force of the track on the car at the top of the hill if the car's speed is 11 m/s?
N

upward
downward
no force
(b) What are the magnitude and direction of the force of the track on the car at the top of the hill if the car's speed is 17 m/s?
N

upward
downward
no force

2007-10-01 06:57:43 · 3 answers · asked by Wonder 2

2007-10-01 06:19:44 · 10 answers · asked by Alexander 6

1) The current in an electromagnet connected to a 240-V line is 12.8 A. At what rate must cooling water pass over the coils if the water temperature is to rise by no more than 7.5 celcius degrees?

2) what is the efficiency of a 0.5 hp electric motor that draws 4.4A from 120V line?

2007-10-01 05:59:48 · 3 answers · asked by eri 1

3 particles are located in the x-y plane. Particle 1 has a charge Q1=2.0uC and coordinates (0cm,0cm) particle 2 has a charge Q2=-2.0uC and coordinates (3cm,0cm) and particle 3 charge Q3=-3.0uC
and coordinates (0cm,3cm) find
a) magnitud
b) direction of the electric field at coordinates (1.5cm,1.5cm)
C)find the magnitud and d) direction of the force exerted on a fourth particle with charge Q4=3.0uC and coordinates (1.5cm,1.5cm)

2007-10-01 05:48:20 · 1 answers · asked by azulita 3

2007-10-01 05:29:36 · 5 answers · asked by Anonymous

2007-10-01 05:28:57 · 3 answers · asked by Anonymous

I need homework help....

Indicate which of the following physics symbols denote units and which denote variables or quantities.

C
(italic) c
(italic) C
(italic) t
T
(italic) T

2007-10-01 05:24:27 · 1 answers · asked by Anonymous

why do mass appear to gain weight when being accelerated upward.... is there an equation to explain it, if so which one is it...

2007-10-01 05:05:25 · 6 answers · asked by Dan 2

This is a muti choice question
(a) accidents
(b)density
(c) gravity
(d) transit

2007-10-01 05:04:49 · 4 answers · asked by Anonymous

2007-10-01 04:57:19 · 1 answers · asked by prateek 1

Calculate the centripetal acceleration and the centripetal force acting on a wooden block. Recall that the block's mass is 0.21 kg, with radius 0.70 m, and the block makes 15 rotations in 18.4 s.

2007-10-01 04:46:51 · 2 answers · asked by Anonymous

Jupiter is the largest planet in our solar system, having a mass and radius that are, respectively, 318 and 11.2 times that of earth. Suppose than an object fallsfrom rest near the surface of each planet and that acceleration due to gravity remains constant during the fall. Each object falls to the same distance. Determine the ratio of the time of fall on Jupiter than that to Earth.

2007-10-01 03:29:51 · 3 answers · asked by Ariel 2

options are
1)rock oil
2)heavy oil
3)Gas oil
4)residue
5)none

2007-10-01 03:01:47 · 10 answers · asked by shruthi3993 1