Physics - October 2007

an 80 kg basketball player catches a pass in the air after landing immediately jumps to dunk. (vertical velocity is 3 m/s downward) and (vertical velocity is 4 m/s upward)

2007-10-05 09:51:53 · 1 answers · asked by keebler 1

An elevator of mass 800 kg acclerates at 3.0 m/s^2 Down. What is the force exerted on the elevator by the cable?

A 0.14 kg baseball requires a velocity of about 75 m/s in order to clear the fence in right field. What is te average net force applied to the ball by the bat if the ball was at rest when struck (on a tee) and is in contact with the bat for 6.0 x 10^-4 seconds?

A tennis racket, in contact with a ball (55 g) for 0.00050 s changes the ball's velocity from 30m/s [East] to 40 m/s [West]. What is the average force exerted on the ball by the racket?

A 0.25 kg model rocket acclerates from 15 m/s to 40 m/s in 0.60 s. Calculate the force(s) the escaping gases exert on the rocket?

A submarine rescue chamber has a mass of 8.2 tons (8200 kg) and safely descends at a constant velocity of 0.4 m/s, determine the force exerted by the bable and the water (buoyant force) on the chamber.

2007-10-05 09:51:01 · 2 answers · asked by Anonymous

Diagram Description:- there are 4 balls(mass A, B, C, D) and mass of each ball is 2.0kg and their arrangement is in a figure of a square set apart 10cm from each other< sorry couldn't draw figure

QUESTION >>>Find the magnitude of the net gravitational force on mass A

2007-10-05 09:50:12 · 2 answers · asked by Boojin 1

A step-down transformer (turns ratio = 1:8) is used with an electric train to reduce the voltage from the wall receptacle to a value needed to operate the train. When the train is running, the current in the secondary coil is 1.6 A. What is the current in the primary coil?
_______________A

2007-10-05 09:38:20 · 1 answers · asked by Foxx 1

1) How long does it take for you hit the water if you drop off a high diving board which is 7.6 meters high?

2)What is your car's final velocity if you are initially going 6 m/s and then accelerate at 9.3 m/s2 for 0.60 seconds?

please solve them and explain how you solved.
Thanks

2007-10-05 09:27:39 · 1 answers · asked by Anonymous

Given:
Angle of Launch is Θ; 0° < Θ < 90°
Velocity of Launch is V
For simplicity, gravity causes objects to fall at 5t² meters, where t is the number of seconds the object has fallen.
No air/wind effects
Landing location is the same elevation as launch location on a flat plane.
Flight path is in 2 dimensions.

Express in terms of V and Θ:

Total number of seconds the rocket is in flight
Total number of meters the rocket travels horizontally
Total number of meters above ground the rocket reaches at its highest point

Thanks for your consideration!

2007-10-05 09:25:16 · 2 answers · asked by Timothy H 4

2007-10-05 09:24:37 · 6 answers · asked by Jordan 2

1)What is the acceleration of a car that goes from rest to 71 mi/hr in 12.0 seconds?

2) At Cedar Point, you can win a prize if you predict your throwing speed. Tony decides to get an advantage and measure his throwing speed beforehand. He throws a baseball straight up as hard as he can and it comes back down to him 6.5 seconds later. At what velocity did he throw it upward?



Please solve and explan how you solved.
Thank you

2007-10-05 09:15:19 · 2 answers · asked by Anonymous

A 4.10 kg block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of 37.0 N. Figure 6-26 gives the block's speed v versus time t as the block moves along an x axis on the floor. What is the coefficient of kinetic friction between the block and the floor?

for the table
the speed is 5m/s.

2007-10-05 08:38:59 · 2 answers · asked by Anonymous

The roots of maple suck in water from underground, and pump it into the trunk. If we cut the bark, we can collect the syrup at significatly higher level of altitude. Does not it violate conservation of energy, and if not, what is the mechanism behind this phenomenum?

2007-10-05 08:38:46 · 3 answers · asked by Alexander 6

If it were possible to drill a hole big enough for a small man, maybe gary coleman, to go through, what do you think would happen?

2007-10-05 08:25:51 · 5 answers · asked by Anonymous

Ok folks out of 20 problems this is the last problem on my review sheet,(I have the answers) but I have the no clue on how to work it out and I'm stuck so please I have an exam this monday and our professor mentioned that there was going to be a similiar question like this one so anybody please help?!?!?!?!


A 10kg crate is pulled up a rough 20 degree incline by a 100N force parallel to the incline. The initial speed of the crate is 1.5m/s, the coefficient of kinetic friction is .4, and the crate is pulled a distance of 5m. Determine how much work is done by
(A)the gravitational force,
(B)the100N force?
(C)What is the change in kinetic energy of the crate?
(D)What isthe speed of the crate after it is pulled 5m?
(E)How much mechanical energy is lost?

2007-10-05 08:17:26 · 2 answers · asked by ls1shadow 1

If you are good at physics, or enjoy doing it, I need some serious help. I've researched and have purchased the book, Physics Demystified, and I still don't understand.

I'm currently working on this worksheet and all the problems seem totally irrevelant to what I was just "taught."

Please send me an email if you would be willing to help me with my assignment promptly. I am not asking for the answers, but there are 8 problems I have been staring at for two days not knowing what to do.

Thanks.

2007-10-05 07:42:49 · 4 answers · asked by alexie. 4

Where does the radiated energy difference come from?

2007-10-05 07:20:54 · 4 answers · asked by Anonymous

2007-10-05 07:13:30 · 8 answers · asked by Anonymous

A gymnast of mass m climbs a vertical rope attached to the ceiling. You can ignore the weight of the rope.

Calculate the tension in the rope if the gymnast climbs at a constant rate.
Take free fall acceleration to be g

Calculate the tension in the rope if the gymnast hangs motionless on the rope.
Take free fall acceleration to be g.

Calculate the tension in the rope if the gymnast accelerates up the rope with an acceleration of magnitude .
Take free fall acceleration to be g

Calculate the tension in the rope if the gymnast slides down the rope with a downward acceleration of magnitude .
Take free fall acceleration to be g.
.

2007-10-05 06:57:27 · 2 answers · asked by Anna 1

withindianfood,goodresponce andgood hospality

2007-10-05 06:38:45 · 2 answers · asked by grnikam 1

A bucket of water with mass 6.00kg is accelerated upward by a cord of negligible mass whose breaking strength is 78.0N .

Apply Newton's second law to the bucket and find the maximum upward acceleration that can be given to the bucket without breaking the cord.

2007-10-05 06:28:52 · 5 answers · asked by swtgirl988 2

A chair of mass 8.00 kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force 35N that is directed at an angle of 35.0 below the horizontal and the chair slides along the floor.

Use Newton's laws to calculate the normal force that the floor exerts on the chair.
Take free fall acceleration to be 9.80 m/s^2.

2007-10-05 06:24:40 · 1 answers · asked by swtgirl988 2

Two very long parallel cylindrical channles are drilled through a very large block of material. The block is so large, that it can be considered infinitely large.

http://i24.tinypic.com/2mhu73s.jpg

The diameter of the channels is 16cm, and distance between theier centers is 20cm. One cylinder contains cold +10C water, and the other contains hot +50C water. Thermal conductivity of the material is 10 W/cm/C.

How much heat flows from hot to cold water per 1cm length?

2007-10-05 05:32:08 · 2 answers · asked by Anonymous

Is there a difference in impact if the heavier or the lighter object carries the velocity?

2007-10-05 04:26:54 · 3 answers · asked by Robert W 1

A cork from a bottle shoots out at an angle of 20degrees above the horizontal. If the cork travels a horizontal distance of 1.30m in 1.25seconds, what is the intial speed??


Thanks sooo much for the help. It is appreciated! :)

2007-10-05 04:01:13 · 1 answers · asked by PaNaSoNiCeDgE 1

Sue was slicing Vidalia onions and her eyes were tearing. a 1.4 g tear drop fell 0.4 m and splattered onto the kitchen counter top. How much momentum did the tar impart to the counter top? (Ignore air resistance,)

2007-10-05 03:48:03 · 3 answers · asked by CarzCrashzHeartz 3

2007-10-05 03:43:51 · 1 answers · asked by Anonymous

2007-10-05 03:35:03 · 6 answers · asked by VILAS S 1

The horizontal and verical components of the intial velocity of a projectile are 24m/s and 7m/s, respectively. Find the initial velocity of the projectile.



Thanks sooo much for the help. It is appreciated! :)

2007-10-05 03:25:16 · 4 answers · asked by Anonymous

I am conducting an experiment, I was wondering if you know of any substitutes for antacid. Thank you.

2007-10-05 02:17:28 · 4 answers · asked by Gator Girl 5

devise a laboratory physics experiment to determine steam's specific heat capacity at constant volume.

2007-10-05 00:42:45 · 1 answers · asked by gladiator 1

Is it because that
a. their bodies have a very high resistance
or
b.they are connected to earth
or
c.there is no potential difference between their legs

really appreciate if you could provide me with a thorough explanation!
thanks

2007-10-05 00:34:46 · 11 answers · asked by Anonymous

what the heck do you call this it's on the tip of my tounge I just can't quite remember.

2007-10-04 20:52:33 · 3 answers · asked by JoeSchmoe 2