Physics - December 2006

A 2.26 book is dropped from a height of 1.5m
a) What is its acceleartion?
Its acceleration is 9.81m/s^2 because of the force of gravity on the book when on the earth.

b) What is its weight in newtons?
F=ma
f= (2.26kg)(9.81m/s^2)
F= 22kg * m/s^2

Anything wrong?
F=22N

2006-12-04 14:56:33 · 3 answers · asked by billf39 2

I've seen toys that levitate and spin objects just by using magnetism, why can't we tap this source of energy to generate power?

2006-12-04 14:45:24 · 8 answers · asked by Anonymous

A baseball is launched from ground level with initial velocity of 38m/s inclined at 25 degrees to the horizontal.

We established in class that the ball would be in the air for

t = 2v0y /g = 3.3s

2006-12-04 14:43:15 · 5 answers · asked by Anonymous

2006-12-04 14:34:10 · 1 answers · asked by Jonny mac 1

The board is fixed to two pedestals separated by distance d=1.5m. Of the forces acting on the board, what are the (a) magnitude and (b) direction (up or down) of the force from the left pedestal and the (c) magnitude and (d) direction (up or down) of the force from the right pedestal? (e) Which pedestal (left or right) is being stretched, and (f) which is being compressed?

Answers :(a) 1.2kN
(b)down
(c)1.7kN
(d)up
(e)left
(f)right

Dont know how they got these answer so if you can please shoe how.

2006-12-04 14:33:45 · 2 answers · asked by gods1princesschanel 1

A 1000kg sports car accelerates from rest to 25.0 m/s in 7.5 s. What is the average power output of the automobile engine?

20.8 kW
30.3 kW
41.7 kW
52.4 kW

i worked this one over and over and i did not get any of these answers so i would appreciate it if someone could share their answers with me.

2006-12-04 14:17:43 · 3 answers · asked by strawberrylollipop12345 1

You are boating on a river that flows toward the east. Because of your knowledge of physics, you head your boat 53 degrees west of north and have a velocity of 6.0 m/s due north relative to the shore.

a. What is the velocity of the current?

b. What is the speed of your boat relative to the water?

Please help me with this problem.
I'm having trouble understanding it.

I asked this question once before, but the answer I received was not helpful.

2006-12-04 14:11:14 · 1 answers · asked by swimmertommy 1

You row a boat, click for picture, perpendicular to the shore of a river that flows at 3.0 m/s. The velocity of your boat is 4.0 m/s relative to the water.

*Picture link:
http://img208.imageshack.us/img208/7021/scanye9.jpg

a. What is the velocity of your boat relative to the shore?

b. What is the component of your velocity parallel to the shore? Perpendicular to it?

Please help me with this problem.
I'm having trouble understanding it.

2006-12-04 14:09:55 · 1 answers · asked by swimmertommy 1

An airplane flies at 200.0 km/h relative to the air. What is the velocity of the plane relative to the ground if it flies during the following wind conditions?

a. 50.0-km/h tailwind

b. 50.0-km/h headwind

I'm confused on this problem.
Please help!

I asked this question before, but the answers were not helpful.

2006-12-04 14:08:31 · 3 answers · asked by swimmertommy 1

2006-12-04 14:00:51 · 16 answers · asked by ? 2

2006-12-04 13:57:07 · 7 answers · asked by Crofty 1

A satellite has a mass of 100kg and is in an orbit at 2.00 times 10 to the 6th power m. above the surface of the Earth. What is the potential energy of the satellite at this location? What is the magnitude of the gravitational force on the satellite?

2006-12-04 13:56:05 · 2 answers · asked by Kitana 2

physics energy problem

2006-12-04 13:55:56 · 1 answers · asked by britt m 1

What I mean is, if a car is going faster than another, it is eventually miles and miles ahead, why doesn't a fly gain time so that he is eventually on a completely different day to you and therefore doesn't notice when you try to swat him because he is reacting to something in the future instead?

2006-12-04 13:46:14 · 12 answers · asked by melissa v 2

A bobsled zips down an ice track starting at 150 m vertical distance up the hill. Disregarding friction, what is the velocity of the bobsled at the bottom of the hill? (g=9.81m/s2)

I got 54m/s anyways here are the answer choices:

27m/s
36m/s
45m/s
54m/s

btw i'm asking because for 3 answers in a row i got D so i'm just trying to make sure i'm not messing up here thanks.

2006-12-04 13:38:43 · 4 answers · asked by strawberrylollipop12345 1

A satellite has a mass of 100kg and is in an orbit at 2.00 times 10 to the 6th power m. above the surface of the Earth. What is the potential energy of the satellite at this location? What is the magnitude of the gravitational force on the satellite?

2006-12-04 13:33:21 · 1 answers · asked by Kitana 2

Old faithful geyser shoots water every hour to a height of 40.0 m. With what velocity does the water leave the ground? (disregard air resistance; g=9.81m/s^2.)

A. 7.00 m/s
B. 14.0 m/s
C. 19.8 m/s
D. 28.0m/s

2006-12-04 13:28:57 · 9 answers · asked by strawberrylollipop12345 1

A pirate in a movie is carrying a chest (0.27 m 0.32 m 0.17 m) that is supposed to be filled with gold. To see how ridiculous this is, determine the weight (in newtons) of the gold. To judge how large this weight is, remember that 1 N = 0.225 lb.

Yea, ro = M/V. I know this is the equation I use for this problem but I'm not sure how to incorporate the variables into the equation.

2006-12-04 13:28:10 · 3 answers · asked by Confused 1

You are boating on a river that flows toward the east. Because of your knowledge of physics, you head your boat 53 degrees west of north and have a velocity of 6.0 m/s due north relative to the shore.

a. What is the velocity of the current?

b. What is the speed of your boat relative to the water?

Please help me with this problem.
I'm having trouble understanding it.

2006-12-04 13:23:28 · 4 answers · asked by vicky p 1

You row a boat, click for picture, perpendicular to the shore of a river that flows at 3.0 m/s. The velocity of your boat is 4.0 m/s relative to the water.

a. What is the velocity of your boat relative to the shore?

b. What is the component of your velocity parallel to the shore? Perpendicular to it?

Please help me with this problem.
I'm having trouble understanding it.

2006-12-04 13:20:11 · 4 answers · asked by vicky p 1

2006-12-04 13:10:17 · 30 answers · asked by blah 1

A 3.00kg toy falls from a height of 10.0 m. Just before hitting the ground, what will its kinetic energy be? (Disregard air resistance; g=9.81m/s^2.)

A. 98.0J C. 29.4 J
B. .98J D. 294 J

2006-12-04 13:09:23 · 1 answers · asked by strawberrylollipop12345 1

2006-12-04 13:01:55 · 5 answers · asked by light 1

A glass bottle of soda is sealed with a screw cap. The absolute pressure of the carbon dioxide inside the bottle is 1.65 x 10^5 Pa. Assuming that the top and bottom surfaces of the cap each have an area of 4.60 x 10^-4 m2, obtain the magnitude of the force that the screw thread exerts on the cap in order to keep it on the bottle. The air pressure outside the bottle is one atmosphere.

Okay, I know Pressure equals Force/Area. I believe is the 4.6e-4 and the Pressure is 1.65e5. I plug those in and solve for F but that is wrong. What am I doing wrong and not taking into consideration?

2006-12-04 12:54:30 · 2 answers · asked by Confused 1

2006-12-04 12:45:43 · 5 answers · asked by Anonymous

a 150 kg football player has a momentum of 750kg m/s and he tackles another player with a mass of 100 kg and a velocoty of 0m/s.

2006-12-04 12:42:03 · 2 answers · asked by foxy lady 2

If time is just a measurement , how can it be a thing. if a time machine is possible, even at the smallist percentage....well a time machine is a way to bend time. if you can "bend" time and you cant "bend" any other measurement, how can it be a "thing"?


AGE 11

2006-12-04 12:28:55 · 8 answers · asked by conƒused-little-man 2

2006-12-04 12:26:19 · 8 answers · asked by skzippo@sbcglobal.net 1

If the earth is spinning at nearly 1000 miles-per-hour, counter-acting gravity with centrifugal force, does a person weigh more at the poles than at the equator?

2006-12-04 12:14:47 · 11 answers · asked by mrknositall 6

an object with a mass is moving with a certain velocity

2006-12-04 12:12:28 · 5 answers · asked by foxy lady 2