Physics - October 2007

a)volume of water
b)weight of water
c)both
d) neither
I think it displaces its weight, but volume I'm not sure about.

2007-10-19 16:23:58 · 5 answers · asked by AnonymousOne 2

what is the probability of selecting a red ball?

2007-10-19 16:18:08 · 7 answers · asked by Anonymous

Now, Im not crazy to ask of a device that could bend the laws of physics in order to spin or create its own gravity in mid air.
For example: If you took a top (no real name for it, mabey spinner) and spun it, it would spin on it's tip and not fall down.
Would this involve a gyroscope in order to balnace?
Please answer with comments and conserns.
Thanks.

2007-10-19 16:05:54 · 6 answers · asked by taco 2

2007-10-19 16:04:14 · 4 answers · asked by madushanka 1

A child exerts a tangential 50.0N force on the rim of a disk-shaped merry-go-round with a radius of 2.50m. If the merry-go-round starts at rest and acquires an angular speed of 0.0800rev/s in 5.00s, what is the child's mass?

2007-10-19 15:50:55 · 6 answers · asked by Nik 1

height of 1.65m. suppose the ball is in contact with the floor for 15.0ms. What is the magnitude of its average acceleration during the contact with the floor?

2007-10-19 15:17:54 · 3 answers · asked by bigtregre 1

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2007-10-19 15:15:42 · 3 answers · asked by Anonymous

was 6.509s. In 2001, Sam Whitt beat Hubers record by 19.0km/h. what was Whitt's time through the 200m?

2007-10-19 15:15:12 · 2 answers · asked by bigtregre 1

Things to keep in mind:
1) Is gravity its own law distinct and non volitile compared to the S/W nuclear and electromagnetic? maybe?
2) The [S/W nuclear and electromagnetic] are they interelated while gravity is a force effective with the precense of mass only?
3) Elements and thier properties

2007-10-19 14:45:08 · 1 answers · asked by Gobi 4

I know first is tounge, second is groping and home is penetration, but what's third?

2007-10-19 14:19:55 · 4 answers · asked by Anonymous

You are in an empty room and you have a transparent glass of water. The glass is a right cylinder, and it looks like it's half full, but you're not sure. How can you accurately figure out whether the glass is half full, more than half full, or less than half full? You have no rulers or writing utensils.

2007-10-19 14:14:27 · 4 answers · asked by cuddleswthyou 1

I'm stuck on this Hw problem:

Find the magnitude and the direction of the velocity for each of the following sets of velocity components

1.) vx = -5 m/s and vy = -7 m/s

I got that it's 8.6 m/s at and im not sure the ________ degree from (the positive x axis)_

2007-10-19 14:04:54 · 3 answers · asked by Chaz 3

A shell is fired from the ground with an initial speed of 1.54* 10^3 m/s at an initial angle of 53° to the horizontal.

(a) Neglecting air resistance, find the shell's horizontal range.

(b) Find the amount of time the shell is in motion.

2007-10-19 13:51:51 · 1 answers · asked by Anonymous

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 16 m/s. The cliff is h = 36 m above the water's surface.

(a) How long does it take for the stone to fall to the water?

(b) With what speed does it strike the water?

2007-10-19 13:50:59 · 1 answers · asked by Anonymous

2007-10-19 13:19:29 · 2 answers · asked by ThaLea 1

1a. A dragster and driver together have mass
930.6 kg. The dragster, starting from rest,
attains a speed of 26 m/s in 0.61 s .
Find the average acceleration of the drag-
ster during this time interval. Answer in units
of m/s2.
1b. What is the size of the average force on the
dragster during this time interval? Answer in
units of N.
1c. Assume: The driver has a mass of 71.5 kg :
What horizontal force does the seat exert
on the driver? Answer in units of N.

2007-10-19 13:19:13 · 2 answers · asked by imigeofinvsible 1

i am in an 8th grade physics class and i have a science fair project due. i wanted to calculate the kinetic friction of ice but after further research, i found out that this might be harder than i anticipated. can anyone put this in a simple explanation for me?

2007-10-19 13:15:34 · 2 answers · asked by Anonymous

i had a test and we had these questions i dont think i got it right so can someone plz explain this problem how to solve it step by step.thank you

1a) The force of a friction acting on a sliding crate is 155N.
how much force must be applied to maintain a constant velocity?answer in units of N.

b)what will be the net force acting on the crate?answer in units of N.

2)a race car travels along a raceway at a constant Velocity of 200km/h.
what is the net force acting on the car.

2007-10-19 12:56:42 · 2 answers · asked by Lve_SRK 1

Given: d = 80m , T=7.1s

Determine the angle of the initial velocity with respect to the horizontal. (in radians)

Thanks!

2007-10-19 12:45:11 · 2 answers · asked by Anonymous

A high-flying jet cruises at an altitude of 30,000 feet at a constant velocity of 700 km/h. The force of the jet engines is 40,000 N. How much air drag acts on the craft?

The only formula we were given is:
WEIGHT = MASS x GRAVITY


Thank you!

2007-10-19 12:10:27 · 2 answers · asked by Anonymous

(forget the fact its red hot in the middle), and dropped a brick through the hole would it come out the other side or eventually stop in the middle?

2007-10-19 12:07:01 · 15 answers · asked by Anonymous

2007-10-19 11:49:39 · 12 answers · asked by . 4

Starting with an initial speed of 5.00 m/s at a height of h = 0.330 m, the m1 = 1.45 kg ball swings downward and strikes the m2 = 4.40 kg ball that is at rest, as the drawing shows.


(a) Using the principle of conservation of mechanical energy, find the speed of the 1.45-kg ball just before impact.
i know this = 5.61 m/s
(b) Assuming that the collision is elastic, find the velocities (magnitude and direction) of both balls just after the collision.
(1.45-kg ball)= i know this is -2.829 m/s
*(4.40-kg ball)=?
(c) How high does each ball swing after the collision, ignoring air resistance?
*(1.45-kg ball)=?
* (4.40-kg ball) =?
i can't figure out the starred ones

2007-10-19 11:22:07 · 1 answers · asked by samiam389 1

R = 200 Ω, C = 2.0 μF. Initially the capacitor is charged up to 100 Volts. Then the switch is closed, and the capacitor is discharged. Select True or False for the following statements.

The time constant τ of the circuit is 4.00E-4 s.? true or false
If the resistance R is doubled, then the capacitor will be discharged twice as slow. true or false?
After one time constant the voltage across the resistor is 36.8 V. true or false

2007-10-19 11:21:28 · 1 answers · asked by Anonymous

2007-10-19 10:42:17 · 4 answers · asked by Anonymous

2007-10-19 10:23:01 · 4 answers · asked by lisa 2

Two ice skaters are holding hands at the center of a frozen pond when an argument ensues. Skater A shoves skater B along a horizontal direction.

(a) Identify the horizontal forces acting on A.
__skater B's momentum
__skater A's inertia
__gravity
__force from skater B
__normal force of ice



(b) Identify the horizontal forces acting on B.
__force from skater A
__normal force of ice
__gravity
__skater B's inertia
__skater A's momentum


(c) Which force is greater, the force on A or the force on B?
__the force on A
__the force on B
__the forces are the same size
__we need to know the skaters' masses

(d) Can conservation of momentum be used for the system of A and B?
__yes
__no

Defend your answer.


(e) If A has a mass of 0.620 times that of B, and B begins to move away with a speed of 2.25 m/s, find the speed of A
in m/s

2007-10-19 10:18:05 · 2 answers · asked by Sasha 1

2007-10-19 10:03:26 · 11 answers · asked by Anonymous

______C_____
l---------------------l
l---------------------l
R-----------------L
l---------------------l
l---------------------l
l-------~------------l

what is the value of the inductance L so that the above circuit carries the largest current?

data: R= 2.69 x 10^2 ohm, f=1.81 x 10^3 Hz, C=6.10 x 10^-3 F, Vrms = 7.29 x 10^1 V

2007-10-19 10:01:06 · 3 answers · asked by Anonymous

****How much shelter will be found in each case by taking a small boat to the lee side of the island?

2007-10-19 09:39:57 · 1 answers · asked by kntagler 1