# Math/Physics

206,302 results, page 65

### Math xc

I've tried and tried to answer this question..I just hate math and math hates me. So let's get to the point why you are all here 1:Find the unit price for each option below. Round to the nearest cent when necessary. Indicate which option is a better buy. Option 1: 10 candybars...

### physics

Your physics teacher drives an ideal frictionless car of mass 1000 kg which coasts along the level road to his home at a constant speed of 48 km/h with the engine turned off. It then coasts 40 m up his sloping driveway and comes to rest at the top without any braking required...

### Atomic physics

5)a. Electrons accelerated by a potential difference of 12.23 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength. b. Calculate the wavelength of light emitted with the shortest possible ...

### ATTN: DRWLS RE: PHYSICS

pete and john play a game of tug f war on a frictionless icy curface. pete weighs 539 N and john weights 392 N. during the course of the game, john accelerates toward pete at a rate of 3 m/s^2 a)what's the magnitude of the force that peter exerts on john? b)what's the ...

### physics (pendulums)

i understand the PE and KE and MKE points and how gravity effects a pendulum, but how does kenetic and potential energy effect it?

### more physics

in the equation P= 2m/ ne^2 t what do these symbols mean? p - resistor m - mass of e- n - ?? e - electron charge>?? t - time between collisions??

### PHYSICS

IT TAKES YOU 9.5 MIN TO WALK AN AVREAGE VELOCITY OF 1.2 M/S TO THE NORTH FROM THE BUS STOP TO THE MUSEUM ENTRANCE. WHAT IS YOUR DISPLACEMENT?

### physics...please check my answer...

4.A mass of one kg of nickels has a monetary value in the US $ of approximately: a. $1 b. 10 cents c. $10 d. $1000 is it c?

### physics Again

bobpursley can you please check my reply to your post about my question? I am not sure if I did my equation correctly. Thanks

### physics

Could someone tell me if this is right? The voltage across a 10-ohm resistor carrying 3 amps must be E=I*R == E=3*10= 30 volts

### Physics

Is the answer to this 4? If the filament resistance in an automobile headlamp is 3 ohms, how many amps does it draw when connected to a 12-volt battery?

### Physics

I have a 1000 ohm resistor with a measured resistance of .967 how do I use submultiples or mutliples to get it in the SI units?

### Physics

Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characteristic radiation characteristics?

### Physics

A football is kicked at 15 m/s with an angle of 35 degrees with the ground. How long is it in the air? How far will it land? Can someone help plz... Thanks!

### physics

A positive and a negative charge, each of magnitude 1.7 10-5 C, are separated by a distance of 11 cm. Find the force on each of the particles. what formula do i use?

### physics

how much kinetic energy will an electron gain in J and eV if it accelerates through a potential difference of 23,000 volts

### physics

you chop 50 g of ice at 0 degrees celsius into 200g of water at 40 degress celcius. What is the final temperature?

### physics

The automobile is originally at rest at s = 0. If its speed is increased by dv/dt = (0.05t2)ft/s2, where t is in seconds, determine magnitudes of its velocity and acceleration when t = 18 s.

### physics repost

A 1.00-kg ball is attached to a string of 0.50 m and swung in a horizontal circle with a velocity of 2.00 m/s. Find the centripetal acceleration. ac=v^2/r = 2.00^2/.50 = 8.0 m/s^2

### Physics

The discreteness of the energy levels of electrons about the atomic nucleus is best understood by considering the electron to be a .....?

### Physics

How does Rutherford's model of the atom account for the back-scattering of alpha particles directed at the gold foil?

### Physics

If a pair of carbon atoms were fused, and the product were to emit a beta particle, what element would be produced?

### Physics

List at least two major potential asvantages of power production by fusion rather than by fission.

### Physics

The position of some object moving along the x-axis is observed to be x(t)=9cos(pi*t/3+pi/4) meters. Find the frequency.

### physics

A lamp operates with a current of 0.625A and a potential difference of 120V. What is the currnt flowing through the microwave?

### physics

Calculate the energy released in the fusion reaction 2 3 4 1 1 H + 1 H->2 H +0 n. The atomic mass of 3 1 H (tritium is 3.016049 u. I am lost! help please!

### science

which physics principles are employed in stopping a runaway truck in a gravel and sand ramp at the bottom of a mountain?

### Physics

What happens when you plug more equipment into apower board in terms of it's resistance and current. Explain.

### physics

Charge polarization is normally produced by: nuclear interactions. contact. induction. friction. electrostatic means.

### Physics

1. What constant acceleration, in SI units, must a car have to go from zero to 69.0 mph in 13.0s ? 2. What fraction of g is this? (the unit for this answer is % of g)

### physics

Calculate the electrical attraction that a proton in a nucleus exerts on an orbiting electron if the two particles are 1.13×10^-10 m apart.

### Physics

What is the acceleration of a skateboard down a ramp inclined at 19.5 degrees to the horizontal? 3.271 is the answer. This shouldn't be too tough, but I can't get it. Thanks!

### Physics

calculate the magnitude of the resultant of a pair of 100-km/h velocity vectors that are at right angles to each other. Please help me! thanks!

### physics

a guy throws a ball up and catches it 3.5 seconds later. what is the max height and initial velocity. Please help!

### Physics

A 100-n boulder is sitting on a shelf 0.5 meters above the floor. What is the potential energy when its in its new location?

### physics

how much time does it take for a student running t an average speed or 5.00m/s to cover a distance of 2.00km?

### physics please help.

how do you measure uncertainy?? for instance.. if the average was .15 and the highest value among the data was .16 and the lowest is .13... how do you find the +-??

### Physics

How many times will the incident beam shown in Figure P25.3 (x = 1.90 m, y = 1.30 m) be reflected by each of the parallel mirrors? mirror on the right

### physics

you slide down a pole at a mass of 80kg with an acceleration of 4m/s^2, How do you show that the friction force that acts on you is 480N?

### physics

Why is it better to put ince rather than an equal mass of cold water into a drink you want to chill?

### physics

Why is it better to put ince rather than an equal mass of cold water into a drink you want to chill?

### Physics

If you take a bite of pizza, the sauce may burn your mouth while the curst, as the same temperature will not. Explain.

### Physics

Ok why would it be necessary for someone to measure oscillations from a 20 cm mark of a suspended ruler as oppose to the center of mass?

### physics

Calculate the speed at the edge of a disc of radius 8.5 cm that rotates at the rate of 4 rev/s. Answer should be in units of m/s Thanks

### physics

express the answer in scientific notation with the correct number of significant figures (8.86+1.0*10^-3) / 3.610*10^-3 2454.57??? please help

### Physics

Explain why the mass of the vehicle does not affect the calculated maximum or minimum velocities for cars on banked curves.

### Another physics question...

Deduce the electric field strenght at a point midway between charges of 7.2*10^-6 C and -3.4*10^-6 C that are 2.0m apart from air. Thank you!

### physics

You are driving south on a highway. Then, without changing speed, you round a curve and drive west. Do you accelerate?

### physics

Two uniform spheres , each of mass M and radius R, touch one another. What is the magnitude of their gravitational force of attraction?

### physics

Why is it vital that there is friction thatb opposes motion when two surfaces try to slide across one another?

### physics

What is the weight in newtons of a 250 g package of cereal? need answer and work shown asap! plz and thank u!

### physics

The diameter of the earth is about 7.6 x 10^3 miles. What is the linear velocity of a person, on the equator, in feet per second?

### Physics

It takes you 9.5min to walk with an average velocity of 1m/s to the north from the bus stop to the museum entrance. What is your displacement?

### physics

How far to the nearest meter can a sprinter running at 9 m/s, travel in the time it takes a rock to fall 28 meters

### physics

Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 5400km.

### physics

How does one go about solving this? A skateboard rider starts from rest and accelerates at a constant +.50 m/s^2 for 8.4s. What is the riders displacement?

### Physics urgent

What is the weight of a 76 kg astronaut on the Moon where the value of 'g' is only 17% the strength of 'g' on the Earth? (Answer should be expressed in N).

### physics

What minimum speed does a 150g puck need to make it to the top of a 3.6m -long, 23 degree frictionless ramp?

### physics

An elevator weighing 2400 N ascends at a constant speed of 5.0 m/s. How much power must the motor supply to do this?

### physics

How long will it take a 1920 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?

### Physics

A satellite orbits at an average altitude of h = 409 km. What is its orbital speed? Use REarth = 6370 km and mEarth = 5.98 x 10^24 kg

### physics

A flashlight that is powered by 12 Volts and uses a bulb with a resistance of 90 Omega will have a current _________________ Amps.

### Physics

Is it possible for the frictional force to increase the mechanical energy of a system? If so, give 2 examples with brief explanations. If not, why not?

### physics

what minimum speed does a 100g puck need to make it to the top of a 3m long 20degree frictionless ramp?

### Physics

Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characeristic radiation characteristics?

### Physics

To suck water up a straw to a maximum height of 98 mm, what minimum gauge pressure must be produced in the lungs?

### Physics

A baseball has a mass of 0.15 kg. A pitcher throws a 40 m/sec fastball which is caught by the catcher. What is the change in momentum of the ball?

### physics

If an object is hung from a cable with a weight of 40 N, what is the tension in the two cables? I got T1=21.23N and T2=18.77 but I don't know if I am doing these problems correctly...

### physics

A broom handle has a length of 1.67m and a mass of 580g with the axis rotation through the center. (what is this problem asking me to do?)

### Physics

A weightlifter raises a 90k-g barbell from the floor to a height of 2/2 m in 0.6 s. What was his average power output during the life?

### physics

If an arrow is fired at 200km/h horizontally, about how long will it take to strike a target 30 meters away?

### Health Physics

As one exhales, what change in energy takes place between the diaphragm and the air in the lungs?

### Health Physics

As one exhales, what change in energy takes place between the diaphragm and the air in the lungs?

### PHYSICS

The force applied by the e-brake is F(eb) = m*a(eb) = -8.13*1452 = -12,100 N I didn't get the same answer - I got 11,804.76....please check

### physics calc based

In the product F = qB (vectors), take q = 2 (neglecting the units of charge, q) and v = 2.0 i + 4.0 j + 6.0 k and F = 4.0 i + (-20 j) + 12 k . What then is B in unit-vector notation if Bx=By ?

### Physics

Find the slope of the line that is tangent to the given function’s graph for the specified value of the independent variable. f(x) = 9x – 8; x=10.

### Physics

Find the slope of the line that is tangent to the given function’s graph for the specified value of the independent variable. f(x) = 9x – 8; x=10.

### physics

a person throws a ball upward into the air with an initial velocity of 20.0 m/s, calculate how high it goes

### physics

sketch a postion time graph for a student walking east with a constant velocity how would that look

### Physics

How fast must a truck travel to stay beneath an airplane that is moving 139km/hr at an angle of 25° to the ground?

### Physics

If the Kitty Hawk Flyer has 12 HP how would you express this power in the SI system and report the numerical value in kilowatts?

### physics

How will the weight of a 20kg object change if it was in a lift that accelerates downward at 4 meters per second squared?

### physics

What is the required resistance of an immersion heater that will increase the temperature of 2.00 kg of water from 10.0°C to 50.0°C in 9.0 min while operating at 120 V?

### College Physics

What will a spring scale read for the weight of a 73 kg woman in an elevator that moves upward with constant speed of 5.4 m/s?

### physics

How long will it take a 230 W motor to lift a 335 kg piano to a sixth-story window 19.0 m above?

### 11th grade Physics

What happens when an insulator is wired in series with the bulb? Is trhe swich open or closed?

### physics

Explain the interference due to thin flims and ahows that the reflected and transmitted systems are complementary to each other.

### 11th grade Physics

What is the current produced by a potential difference of 240 volts through a resistance of 0.2 ohms?

### 11th grade Physics

What voltage is necessary to produce a current of 200 amperes through a resistance of 1 x 10^-3 ohms?

### physics

What is the gravitational potential energy of a 300.0 g coffee cup sitting on a table top 1.25 m above the floor?

### PHYSICS Gr.11

i am completely confued :( what are balanced and unbalanced forces? How can u tell by looking at a free body diagram and/or a problem? thanks

### Physics

A centrifuge has a rotational inertia of 6.0 10-3 kg · m2. How much energy must be supplied to bring it from rest to 420 rad/s?

### physics

If you tried to smuggle gold bricks by filling your backpack, whose dimensions are 63 cm*29 cm*20cm, what would its mass be?

### general physics

If wind blows at 30 m/s over a house, what is the net force on the roof if its area is 300 m^2 and is flat?

### physics

what would be the significance of the photoelectric effect graph if it a) passed through the origin b) had a positive y intercept

### PHYSICS

TWO WEIGHTS ARE ATTACHED TO BOTH ENDS OF A WIRE AND SLIDED ON A BLOCK OF ICE.INVESTIGATE THIS PHENOMENON?

### Physics

What is the frequency shift of a 79 GHz police radar signal when it reflects off a car moving at 110km/h ?

### physics (electric charges)

Hi, How can you charge an electroscope negatively? Is it by using a positively charged rod? Can someone please help me? Thank you :)

### physics (electric charges)

Hi, How can you charge an electroscope negatively? Is it by using a positively charged rod? Can someone please help me? Thank you :)