# Math/Physics

208,897 results, page 66

### 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?

### Physics

A soccer player launches a ball at an angle of 40 degrees, with an initial velocity of 23 m/s. What are the horizantal and vertical for this problem??

### physics

A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?

### physics

A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?

### physics

A large boulder is ejected vertically upward from a volcano with an initial speed of 41.0 . Air resistance may be ignored.