Physics - December 2007

i just need to know the relation in order to solve the following question;
A proton is accelerated from rest through a potential difference of 25700 V

a) whats the kinetic energy of this proton in joules after this acceleration?

b) whats the speed of the proton after this acceleration?

2007-12-17 05:07:15 · 4 answers · asked by G3P 3

If u have a solenoid with current going through it how do we know what side is north and south and if there is a wire placed next to the solenoid how does the solenoid influence direction of the current in that wire?

2007-12-17 05:04:42 · 3 answers · asked by jezero84 1

A 6kg rock is suspended by a massless string from one end of a 7m measuring stick. What is the mass of the measuring stick if it is balanced by a support force at the 1m mark? Answer in kg.

2007-12-17 04:55:03 · 3 answers · asked by Anonymous

2007-12-17 04:21:52 · 5 answers · asked by nonia 1

A rocket sled is propelled by a solid propellant rocket motor of 6.027×10^5 N thrust. If the sled travels 1.776×10^3 m while attaining a top speed of 8.240×10^2 m/s.

i found the acceleration = 1.912×10^2 m/s^2
but what is the mass of the rocket sled?????

2007-12-17 03:45:37 · 3 answers · asked by Anonymous

f-K*x-D*(dx/dt) = M*(d^2x/dt^2)

where:

f = an external force, positive in the +x direction (an initial "impulse" of +100,000N for .0004 seconds)
x = displacement of mass M, in meters (initially stationary at x = 0)
K = a spring constant (15 N per meter)
D = a damping coefficient (40 N-second per meter)
M = a mass (80 kg)

Plot x as a function of time, showing how it varies as a result of the "impulse" Label the axes with appropriate dimensions and plot enough points to reveal the general behavior of x.

2007-12-17 03:20:29 · 1 answers · asked by Bryan G 2

What is the equation for the speed of a bubble rising in water?

2007-12-17 03:19:50 · 1 answers · asked by dlitwhiler 1

The solution to a math problem is often negative, but are none-the-less incorrect when tested against the real world. I am looking for things whose value CAN NOT be negative:

Are these examples?

gravity
mass
the length, area, or volume of anything

Are there others?

2007-12-17 02:19:51 · 6 answers · asked by Anonymous

Can u please tell me the theories of time travel??

Thanks for answering.

2007-12-17 02:17:13 · 4 answers · asked by Anonymous

A ball of mass 522 g starts at rest and slides down a frictionless track, as shown below. It leaves the track horizontally, striking the ground a distance x = 0.66 m from the end of the track after falling a vertical distance h2 = 1.20 m from the end of the track.




(a) At what height above the ground does the ball start to move?
m
(b) What is the speed of the ball when it leaves the track?
m/s
(c) What is the speed of the ball when it hits the ground?
m/s

2007-12-17 02:01:27 · 2 answers · asked by Anonymous

it respond to gravity if it does no have mass?

2007-12-17 02:00:42 · 3 answers · asked by Narok 1

A 1.8 kg ball is attached to a ceiling by a string. The distance from the ceiling to the center of the ball is 1.14 m, and the height of the room is 3.00 m.

(a) What is the gravitational potential energy associated with the ball relative to the ceiling?
J
(b) What is the gravitational potential energy associated with the ball relative to the floor?
J
(c) What is the gravitational potential energy associated with the ball relative to a point at the same elevation as the ball?
J

2007-12-17 01:53:56 · 1 answers · asked by Anonymous

An antique car has a mass of 585 kg with its riders. It starts from rest and travels to its top speed of 18.4 m/s over a distance of 60.89 m. It drives at this speed for 31 s. It is then allowed to roll to a stop. This takes 10.7 s.

alright i found the acceleration which is 2.78 M/s^2 but i need to know How much force acts on the car at the end to make it stop and What is the coefficient of friction between the car and the pavement? but finding the coefficiant is vital for me to understand... please help.

for finding the force i have been using F=ma but it is not working. i used 585 * 2.78 which is the acceleration but the computer is telling me im wrong.

2007-12-17 01:51:46 · 5 answers · asked by molly 1

A 78.0 kg diver steps off a diving board and drops straight down into the water. The net force when in the water is an upward 1020 N. If the diver comes to rest 4.2 m below the water's surface, what is the total distance between the diving board and the diver's stopping point underwater?

2007-12-17 01:44:07 · 1 answers · asked by Anonymous

A spring has a force constant of 570.0 N/m.

(a) Determine the potential energy stored in the spring when the spring is stretched 4.12 cm from equilibrium.

(b) Determine the potential energy stored in the spring when the spring is stretched 2.82 cm from equilibrium.

(c) Determine the potential energy stored in the spring when the spring is unstretched.

2007-12-17 01:42:51 · 2 answers · asked by Anonymous

A ball of mass 522 g starts at rest and slides down a frictionless track, as shown below. It leaves the track horizontally, striking the ground a distance x = 0.71 m from the end of the track after falling a vertical distance h2 = 1.24 m from the end of the track.



(a) At what height above the ground does the ball start to move?

(b) What is the speed of the ball when it leaves the track?

(c) What is the speed of the ball when it hits the ground?

2007-12-17 01:41:32 · 1 answers · asked by Anonymous

Distinguish between P type& N type semi conductors

2007-12-17 01:08:21 · 2 answers · asked by Anonymous

(1) Scalar quantity
(2) Tensor
(3) Vector
(4) None of above

2007-12-17 01:00:48 · 1 answers · asked by ajith k 1

the first
i am high school student
my teacher order me to make a device to detect tsunami,and me with my team,agreed using acceleration sensor to measure the amplitude by knowing the waves speed,and i wanna ask,how the acceleration sensor works?how it can be measure the acceleration?
thx

2007-12-17 00:17:44 · 1 answers · asked by Yangki S 1

2007-12-17 00:11:06 · 2 answers · asked by Just Wondering 1

Concentric conducting spherical shells carrying charges Q and -Q, respectively. The inner shell has neglligible thickness. Determine the electric field (a) less than a (b) between b and c (c) greater than c (d) what is the potential difference between the shell?

2007-12-16 23:51:07 · 1 answers · asked by andz 1

The belt of a Van de Graaf generator carries a surface charge density of 5.0 mC/m². The belt is 0.50 m. wide and moves at 20.0 m/s.

a.What current does it carry?

b. If this charge is raised to a potential of 100.0 kV, what is the minimum power of the motor needed to drive the belt?

I don't understand how to do the question, pls help me, answers with explanations pls, tnx...

2007-12-16 23:50:51 · 2 answers · asked by Sammy Baby 1

Find the potential due to a thin, uniformly non-conducting charged rod of length 2a at the point (y,z). Take the rod along the z axis

2007-12-16 23:46:18 · 1 answers · asked by andz 1

at an accident scene on a level road ,investigator measure a car's skid mark to be 88mlong .the accident occured in arainy day the coeffecient of static friction 0.42etermine the speed of the car when the driver slammed on the brakesans why does the cr's mass doesnt matter

2007-12-16 23:22:44 · 3 answers · asked by Anonymous

combination (1) find the current thru the combination (2) the current thru each branch..

2007-12-16 21:53:18 · 4 answers · asked by tobi 1

I came to know that if we travel at the speed of light than time stops. So if the light travels at it's speed then time should stop for it.

2007-12-16 20:56:30 · 12 answers · asked by Anonymous

plz include the given and the formula?
our topic is about law of motion

tnx

2007-12-16 20:47:32 · 3 answers · asked by cielo a 1

A series RLC circuit has a 200 kHz resonance frequency. What is the resonance frequency if
a.) the resistor value is doubled?
b.) the capacitor value is doubled and, at the same time, the inductor is halved??

2007-12-16 20:22:41 · 6 answers · asked by biscuits 2

I know you can buy them in the USA but surely somone in th uk must sell them

2007-12-16 19:55:12 · 4 answers · asked by Jack 2

what is the difference between velocity is constant and velocity is increasing forwards?

2007-12-16 19:13:34 · 4 answers · asked by sailuvbella 1