# Math/Physics

211,502 results, page 65

### 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 :)

### college physics

Estimate the rotational kinetic energy of Earth, assuming it to be a solid sphere of uniform density.

### physics

how old would you be, when you returned from a trip while traveling at 99.5% C if your relatives that stayed at home, were 10 years older?

### physics

An elevator weighting 2500 N ascends at a constant speed of 8 m/s. How much power must the motor supply to do this?

### Physics

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

### physics

find the total momentum of electrons in a straight wire of lenght 1000m carrying a current of 70A.

### College physics

You have a collection of six 1.0 kilo ohm resistors. what is the smallest resistance you can make by combining them

### Physics

Two objects are moving in different direction. Under what circumstances can you treat this as one-dimensional problem?

### Physics

How much energy is need to place four positive charges, each of magnitude +5.0 mC, at the vertices of a square of side 2.5 cm?

### Physics

How much energy is need to place four positive charges, each of magnitude +5.0 mC, at the vertices of a square of side 2.5 cm?

### physics

Is the acceleration due to gravity more or less atop Mt. Everest than at sea level? Defend your answer.

### Physics

In a gas kept at a constant temperature, all molecules move with the same speed. True or false?

### physics

a plane travels 5.0 x 10^2 while being accelerated uniformly from rest at the rate of 5.0 m/s. what final velocity does it attain?

### physics

A boy sledding down a hill accelerates at 2.00 m/s2. If he started from rest, in what distance would he reach a speed of 5.20 m/s?

### Physics

A golf ball is chipped at an angle of 37 degrees and with a speed of 13.5 m/s. How far does it travel to the nearest tenth of a meter?

### physics

how long does it take a softball to cross homeplate at 43 feet if the ball is going 65 miles per hour?

### Physics

A student travels 6.0 m [E] in 3.0 s and then 10.0 m [N] in 4.0 s. Draw a vector diagram to determine the resultant displacement. Q: How do you know where the starting point is on the graph?

### physics

a pendulum of length L=9.8m hangs in equilibrium and is given velocoity v=0.2m/s at its lowest point.What is the magnitude of the subsequent oscillation?

### Physics

h t t p : / / b i t . l y / 9 S F F F o a) What is the minimum value of F needed to move the two blocks? b) If the force is 10% greater than your answer for (a), what is the acceleration of each block?

### Physics

h t t p : / / b i t . l y / 9 S F F F o a) What is the minimum value of F needed to move the two blocks? b) If the force is 10% greater than your answer for (a), what is the acceleration of each block?

### physics

a pendulum of length L=9.8m hangs in equilibrium and is then given velocity v=0.2m/s at its lowest point.What is the magnitude of the subsequent oscillation?

### physics

how long do waves of frequency 7 hz and wavelength 5cm take to travel across a pool breadth 3.5 metres

### physics

An athlete executing a long jumper leaves the ground at a 27.0 degree angle and travels 7.89 m. What was the takeoff speed?

### physics

what is your age in seconds? this is a conversion problem. someone help please with all the multiplication and division... very confused. THANK YOU

### physics

what is the shortest possible time in which a bacterium could travel a distanceof 8.4 cm across a petri dish at a constant speed of 3.5 mm/s

### physics

The pendulum swings past the pole 14 times in 21 seconds. The weight of the bob is 10g. Calculate the period?

### physics

A 1600 kg car traveling at a speed of 31 m/s skids to a halt on wet concrete where uk = 0.60. how long are the skid marks?

### physics

A train is traveling up a 3.6 incline at a speed of 3.30 when the last car breaks free and begins to coast without friction.

### physics

How long will it take an 850 kg car with 40 hp (horsepower) to reach the speed of 15 m/2, neglecting friction? 40 hp=29840 watts I know P=W/t but what is W?

### physics

If a person does 80 J of work in moving a 30 \rm{kg} box over a 13 m distance on a horizontal surface, what is the minimum force required?

### Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force

### Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force

### Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force

### Physics

is it true or false the monochromatic light has photons of different energies? PLZ DNT 4GET 2 XPLAIN IT

### physics

A car traveling at 7.3 m/s accelerates 4.5 m/s2 to reach a speed of 11.0 m/s. How long does it take for this acceleration to occur? Answer in units of s.

### Physics

A child slides down a hill on a toboggan with an acceleration of 1.5 m/s squared. If she starts at rest, how far has she traveled in 1.0 s, 2.0 s, and 3.0 s?

### physics

A longjumper running at 12 m/s and jumps at 20 degrees. No wind or resistance but gravity is normal -9.81 m/s2. How far will person jump?