# Math/Physics

208,897 results, page 47

### Physics check

A speeder traveling at 41 m/s passes a motorcycle policeman at rest at the side of the road. The policeman accelerates at 3.3 m/s2. To the nearest tenth of a second how long does it take the policeman to catch the speeder? Im sorry I am new to physics this is my first year and...

### algebra 2

Lincoln High School has 98 teachers. Of the 42 female teachers, 8 teach math. One seventh of all of the teachers teach math. What is the probability that a teacher is a man or does not teach math?

### math

i m always having a problem in math. i can't do fraction easilly. im going to have an final exams , starting on 2 april . i hope if any one can help me. You need to tell us, in detail, what you don't understand about fractions. o!isnt the test the...SAT?? yes,,im good at math ...

### physics

gravational force deimos, a satellite of amrs, has an average radius of 6.3 km. If the gravational force between deimos and a 3.0 kg rock at its surface is 2.5x10(-2)N..what is the mass of deimos ? Use the Universal Law of gravitation: Force= G Mm/distance^2 Solve for M. i did...

### physics please help

In a physics laboratory experiment, a coil with 170 turns enclosing an area of 10cm^2 is rotated from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to the field. The rotation takes 5.0×10^2 s . The earth's ...

### Physics. Please help!!

Distruive interference? Unless you put C in the line between A and B, this the asnwer is at infinity. Now on the line between A and B, the distance from A to C has to be an odd multiple of halfwavelength greater than C to B. Now, the distance between the speakers is two ...

### PHYSICS

Long, long ago, on a planet far, far away, a physics experiment was carried out. First, a 0.250 kg ball with zero net charge was dropped from rest at a height of 1.00 m. The ball landed 0.350 s later. Next, the ball was given a net charge of 7.60 muC and dropped in the same ...

### Math/Physics

An electron's position is given by r = 4.00t i - 6.00t^2 j + 5.00 k, with t in seconds and r in meters. In unit-vector notation, what is the electron's velocity? (Answer in terms of i, j, k, t.)What is v in unit-vector notation at t = 8 seconds? What is the magnitude of v at t...

### Physics(Please help)

A person is riding a bicycle, and its wheels have an angular velocity of 26.0 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is 17.6 revolutions. (a) How much time does it take for the bike ...

### PHYSICS

Could u help with physics hw! i keep trying but i keep getting the wrong answer? a 71g autographed baseball slides off of a 1.3 m high table and strikes the floor a horizontal distance of .83m away from the table. 1.how fast was it rolling on the table before it fell off? ok ...

### physics

Give two examples of ways that physicists model the physical world. I was wondering if this would be an effective answer for "give two examples of ways that physicists model the physical world." 1. Physicists build computer simulations. 2. They build small-scale replicas. I ...

### physics

Hi, I am confused about physics, more specifically force. I know that the formula for force is: f=ma So what if an object traveling at constant speed (acc equals zero) collides with a wall? How would you calculate the force, since there is no acceleration? There IS force upon ...

### Physics

An airliner is at point A and is trying to fly to point B, which is 1000 km due North of point A. The pilot of the airliner wishes to reach point B in 2.5 hr. A wind is blowing from the Northwest (45 degrees) at 100 km/hr. In what direction and at what speed must the pilot fly...

### Physics (maybe it's just math)

A sphere of copper is subjected to 89.7 MPa of pressure. The bulk modulus is 130 GPa. a) By what fraction does the volume of the sphere change? b) By what fraction does the radius of the sphere change? for a) I have dV/V = 0.00069 - this is correct. for b) the area I have 4/3 ...

### Math - Precalculus - Parametric Equations/Geometry

A hockey puck of diameter 3 inches is spinning around its center at a speed of 3 counterclockwise rotations per second. The center of the puck is traveling at a speed of 24 inches per second at an angle of 45 degrees to the positive real axis. (a) At time t=0, the center of ...

### physics

Answer the following question:Be sure to show all work. Include formulae and units.Be sure to include relavant, meaningful diagram and a complete circuit diagram with circuit related problem. take enough space, don't try to squeeze everything on a small space!(problems are ...

### AP Physics

Using what's only in chapter one The Nature of Science Models, Theories, and Laws Measurement and Uncertainty; Significant Figuers Units, Standards, and SI System Converting Units Order of Magnitude: Rapid Estimating Dimensions and Dimensional Analysis How am I suppose to ...

### active physics

a 25 mewton force pushes against a 5 kg. mass. what is the acceleration??? what formula do i use?? F=ma

### Physics II

How much work (in joules) is done in moving a charge of 2.5μC a distance of 35 cm along an equipotential at 12~V?

### physics

does the voltage output increase when a generator is made to spin faster? Defend your answer

### physics

If a car travels westward with a constant velocity of 20 m/s, what is the net external force acting on it?

### Physics

2.A 4430 kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?

### Physics

2.A 4430 kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?

### AP PHYSICS >>>please help

HOW WOULD YOU integrate this equation between zero and pi/2 1/(1+(tan^2008)xdx

### Physics

How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?

### Physics

How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?

### Physics

What is the number of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to 1.00×104 Hz?

### Physics

i cant get this right. what is the measured resistance of a 1000ohm, 500ohm and a 100 ohm resistor. and there % error

### Physics

A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers?

### Physics

Displacement is to distance as velocity is to: a. acceleration b. mass. c. speed. d. time I chose C....is this correct?

### Science-- Physics

Does an object need to have a velocity of 0 meters per second to be in equilibrium and why/why not?

### Physics

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC?

### Physics

How do the mainsail and the jib of a sailboat help the boat sail? What do these two sails have to do with force?

### Physics

Aircraft with acceration of magnitude of 42.5 m/s. If starting from rest how long will it take to travel a 2.6 km runway?

### Physics

Why are the armature and field windings of an electric motor usually wound on an iron core?

### Physics

Does the voltage output increase when a generator is made to spin faster? Defend your answer.

### physics

does a ball moving at a constant speed around a circular track produce acceleration?

### physics

In a red glass filter, of the colors that make up white light, which if any are reflected or absorbed?

### Physics

what is the purpose of the double bell jars that surround the international prototype of the kilogram in Paris?

### Physics

If you are viewing a hologram and you close one eye, will you still perceive depth? Explain.

### physics

lenses that always diverge light rays that strike them is that convex or concave? I am not sure.

### Physics

Explain how the photoelectric effect is used to open automatic dooes when someone approaches.

### physics

Calculate the force of gravatational attraction between two spheres of mass 10.1 kg and 45.4 kg that are 38.5 m apart. F = G(m1)(m2)/r^2 = 6.67 x 10^-11(10.1)(45.4)/38.5^2 = 2.06 x 10 ^-11 N

### Physics check

In 1923, Robert Millikan won the Nobel Prize for discovering the mass of the .... electron?

### Physics check

The two quantities conserved in all nuclear equations are....... mass and number?

### Physics

If the third harmonic of a standing wave in a vibrating string is 600 Hz, what is the fundamental frequency?

### physics

Does an object need a net force acing on it in order to move at constant velocity?

### Physics

A student photographs a 18cm flower so it fills half of a 24mm slide. What is the magnification?

### Physics

Two identical charges are 36 mm apart. The electrostatic force between them is 1.3 N. What is the size of each charge?

### college physics

the speed of light is about 3.00 x 10^8 m/s. convert this figure to miles per hour

### 11th grade physics

im not procrastinating i really don't understand it. im not asking for the answers im just asking for a little more help??

### physics

can anyone give me a site that "best explains" about Rotational motion/Angular. thanks a lot.. :)

### Physics

can anyone give a site that have problems about pressure with solution.. urgently needed.. thanks :)

### physics

What is the evidence for the claim that iron exists in a relatively cool outer layer of the sun?

### physics (emergency!)

How much work is required to stop an electron (m = 9.11 10-31 kg) which is moving with a speed of 1.99 106 m/s?

### Physics- 8th Grade

What force is needed to accelerate a 10 kilogram shopping cart 3 m/s^2 (squared)?

### PHYSICS

lIST THE PARTICLES THAT MAKE UP AN ATOM. wHAT ARE THEIR CHARGES? hOW ARE THEY ARANGED? wHAT IS THE APPROXIMATE AMU OF EACH PARTICLE?

### Physics

List the particles that make up an atom. What are their charges? How are they arranged? wHat is the approximate amu of each particle?

### physics

An object experiences an impulse, moves and attains a momentum of 200 kg m/s. If its mass is 50 kg, what is its velocity?

### physics

Why can't you put your heels firmly against a wall and then bend over without falling?

### Physics

What are some possible uses for gelled methanol and why was it never used as a fuel in transportation?

### Physics

If 2.4 m3 of a gas initially at STP is compressed to 1.6 m3 and its temperature raised to 30oC, what is the final pressure?

### physics

If an 80kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3 s, what average power is generated?

### Physics

What is the work required for a 1000kg truck to increase in speed from 30 m/s to 40m/s? Is the answer 350 kJ?

### Physics

What Net Force is necessary to give a 2.0 kg mass initially at rest an acceleration of 5.0 m/s^2? Is the answer 10. N?

### physics

how much work can a 50.0kg wreckin ball traveling at 5.00m/s do when striking a building

### Physics

How does mass affect the motion of objects falling freely under the influence of gravity?

### Physics

How can you easily increase the magnetic field strength inside a current carrying coil?

### Physics

What is the de Brogile wavelength of an electon that strikes the back of the face of a TV screen at 1/10 the speed of light?

### Physics

A cube of ice weighing 18 grams sublimes into vapor. How many liters of gas will you get?

### Physics

What does shifting the phase between the sources in a double slit experiment do to the interference pattern?

### Physics

An object is thrown upwards with a speed of 14.0 m/s. How long does it take to reach its maximum height

### Physics

Could someone tell me the formula for finding distance when time is given and the acceleration is constant?

### Physics

What is the value of a if the object is moving with constant velocity? What does this equation reduce to in such a case?

### physics

The acceleration of a certain rocket is given by a=bt where b is positive cnstant, find the position function Xo and Vo at t=o?

### Physics

The acceleration of a certain rocket is given by ax=bt where b is positive constant, find the position and velocity at t=5.0s if Xo=0 and Vo=0 and b=3.0m/s^3?

### physics

Is it possible to calculate the torque acting on a rigid body without specifying the origin?

### physics

A 1100 kg sports car accelerates from 0m/s to 33m/s in 13s What is the average power of the engine?

### physics

A 4430-kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?

### Physics

Runners in the 100-m dash use starting blocks. Explain what this device does. PLEASE HELP.

### physics

A 1.5 volt battery will increase the potential energy of ________________ coulombs of charge by 0.18 joules.

### physics

What happens when you walk across a carpet and receive a shock when you touch a metal object.

### physics

A particle at rest undergoes an acceleration of 2.1 m/s2 to the right and 5 m/s2 up. a) What is its speed after 7.9 s? Answer in units of m/s.

### physics

If a car is traveling westward with a constant velocity of 20 m/s, what is the net external force acting on it?

### Physics

If the change in position Dx is related to velocity v (with units of m/s) in the equation Dx = Av, the constant A has which dimension? a. m/s^2 b. m c. s d. m^2 I chose b?

### physics

How can you easily increase the magnetic field strength inside a current-carrying coil?

### Physics

How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?

### physcal science/physics

what is the kinetic energy in joules of a 1000 kg car travelling at 90km/h

### Physics

What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/9 the speed of light?

### Physics

Thanx DRWLS! Worked like a charm and I checked behind myself with the same formula!!!

### Physics

Another one, sorry! =P This stuff is really confusing.. Why doesn't friction depend on surface area?

### physics

how many electrons must be removed from an electrically neutral silver dollar to give a charge of +2.8 uc

### Physics

At what temperature is the rms speed of helium molecules half its value at STP (0 C}, 1.0 atm)?

### physics

if a block of wood dropped from a building has attained a velocity of 78 m/s how long has it been falling?

### Physics

what is the mass of hydrogen peroixide, H2O2, in 350 grams ofa 20% by weight solution?

### Physics

A mass of gas has a volume of 380 cm3 at a pressure of 560 mm Hg and a temperature of 7C. What is its bolume at s.t.p.?

### physics

how much energy is gain by an electron accelerated through a potential differenc of 30000v?

### grade 11 physics

what is the index of refraction of a medium in which the speed of this radiation is 2.54X10^8 m/s? I don't even know where to start...

### physics

Determine the percent error in this approximate value. (There are 365.24 days in one year.)