# physics please HELP !

74,760 results, page 98-
## Physics

A man walks 50 m,East, 30 m, South, 20 m,West and 10 m, North. Determine the displacement from the starting point. Find the distance traveled in FPS -
## physics

A 10 kg mass is sitting on a 25 degree incline. A constant force of 49N is applied up the plane. The coefficient of static friction is .25. Does it go up or down or does it stay put? -
## physics

calculate the acceleration of 2kg block on a horizontial friction-free air table when you exert a horizontal net force of 20N. -
## physics

HELP! ok here it goes... Compute the resultant and the equilibrant of the following system of coplanar concurrent forces: 100lbs, 30degrees; 141.41lb, 45degrees; 100lb, 240degrees. -
## Physics- Difficult Please Help

If a 60N weight free falls onto a hollow ball what amounts of force are produced after 3 seconds of impact, if it lands .3m away of the center? -
## physics

A ball is thrown vertically upward with a speed of 27.3 m/s from a height of 2.1 m. How long does it take to reach its highest point? The acceleration of gravity is 9.81 m/s2. Answer in units of s -
## physics

Jessie exerted a force of 400N to move a box across the floor to a distance of5m in 4sec. What is his power is kilowatts? Megawatts? Horsepower? -
## physics HELP!!!

If the coefficient of kinetic friction is .25, how much horizontal force is needed to pull each of the following masses along a rough desk at a constant speed? a. 25 kg b. 15 kg c. 250 g explain please!! -
## physics

total time for a rock drop from top of the well to the bottom and the sound bouve back is 5.6 sec, the well dept is 450 ft, true or false -
## Physics

Three point charges are located at the corners of an equilateral triangle as in the figure below. Find the magnitude and direction of the net electric force on the 0.70 µC charge. (A = 0.70 µC, B = 6.50 µC, and C = -3.90 µC.) -
## Physics

Three point charges, A = 2.2 µC, B = 7.5 µC, and C = -3.9 µC, are located at the corners of an equilateral triangle as in the figure above. Find the magnitude and direction of the electric field at the position of the 2.2 µC charge. -
## physics

a trench mortar fires a shell at an angle of 30 degrees with the horizontal and with a speed of 500 m/s. find its range and the maximum height it attains? -
## physics

Jessie exerted a force of 400N to move a box across the floor to a distance of5m in 4sec. What is his power is kilowatts? Megawatts? Horsepower? -
## Physics

Three point charges are located at the corners of an equilateral triangle(q1=2microC,q2=-4microC).Calculate the resultant electric force on 7microC charge. -
## physics!!!

For the vectors with a = 14, b = 13, and c = 365, calculate the following dot products. NOTE theres a picture but i couldn't upload its a right angle triangle with c as the hypt, a bottom and b side -
## Physics

Find analytically the sum or resultant of the following displacements: A= 10m Northwest , B= 20m 30 degree north of east and C = 35m due Souh -
## physics

Jessie exerted a force of 400N to move a box across the floor to a distance of5m in 4sec. What is his power is kilowatts? Megawatts? Horsepower? -
## physics

a cyclist moving with constant speed 10m/s develop a power of 400 watt. Calculate the average force exerting on the bicycle -
## Physics

A car moving at a constant speed of 50km/h turns a corner, changing it's direction from north to west. What is it's change in velocity. What was the acceleration if the then took 5s -
## Physics

A metal disc of radius R rotates with angular velocity Omega (w) In a uniform magnetic field. Calculate the induced emf develop. -
## physics

four forces 8N,6n,2n and 4n act on a point O in the directions north,east,south and west respectively,find the magnitude of their result and the direction of their resultant force. -
## physics

A sound wave of frequency 1310 Hz., propagating through air at 0 degrees Celsius, has a pressure amplitude of 11.0 Pa. What is the maximum particle speed (in meters/second)? -
## Physics

Workmen are trying to free an SUV stuck in the mud. To extricate the vehicle, they use three horizontal ropes, producing the force vectors shown in the figure. -
## Physics

The length of a box is reduced to two third of its original value and the width and height are tripled. Calculate the factor by which the volume has changed. Am I on the right track? If not please help I am stuck. Thanks. V=LWH V=(L-2/3)(3W)(3H) -
## physics

Two racquetballs, each having a mass of 200 g, are placed in a glass jar as shown in in the figure below. Their centers lie on a straight line that makes a 45° angle with the horizontal. -
## physics

During a baseball game, a batter hits a popup to a ﬁelder 81 m away. The acceleration of gravity is 9.8 m/s 2 . If the ball remains in the air for 6.7 s, how high does it rise? -
## Physics/Science

At what point in the swing of a pendulum is the maximum amount of the ball's motion transferred to the object it hits? What does this "kinetic energy" depend on? -
## physics

Bob heads out into a lake at an angle of 27◦ with respect to the shore. If his boat is capable of a speed of 1.3 m/s, how far from land will he be in 2 min and 28 s ? Answer in units of m. -
## physics

Jessie exerted a force of 400N to move a box across the floor to a distance of5m in 4sec. What is his power is kilowatts? Megawatts? Horsepower? -
## Physics

Find the average velocity of a projetile between the instants it crosses half the maximum heght.It is projected with a speed u at an angle ø(thita) with horizontal. -
## physics

an object of mass 150kg is pulled on a horizontal rough ground by a force of 900newton(N).find the coefficient of static friction (taken g=10m/s) -
## physics

An object is placed (a)6cm (b)20 from a thin convex lens of focal length 10cm.determine the nature,position and magnification of the image in each case. -
## Physics

A man lifts a heavy stone using a bar supported at a stationary point. Which phenomena in daily life in terms of the scientific principles -
## physics

A skier travelling at 14 m s-1 reaches the foot of a steady upward 14° incline and glides 21 m along this slope before coming to rest. What was the average coefficient of friction? -
## physics

The earth's atmosphere extends to a height of nearby 200KM above its surface there many be explosion and noises taking place in the outer space but we do not hear them.why? -
## Physics

"A projectile is launched at 517m/s at 50 degrees from the horizontal on top of a building 150m tall. What is the highest point it will reach?" Need to show all work. Thanks! -
## physics

2 The instrument used for experimental determination of the value of the universal gravitational constant G is called Galilio’s telescope ballistic pendulum Newton’s balance Cavendish -
## physics

A cheerleader lifts his 62.2 kg partner straight up oﬀ the ground a distance of 0.89 m before releasing her. The acceleration of gravity is 9.8 m/s 2 . If he does this 19 times, how much work has he done? Answer in units of J -
## physics-check my answer

in what position can a current-carrying loop of wire be located in a magnetic field so that it doesn't tend to rotate? -I think it would be perpendicular -
## physics

Two sounds, one of 200 Hz and one of 194 Hz occur at the same time. What beat frequency do you hear? Show your calculations I'm not looking for someone to do my homework for me. I just don't know what formula to use to figure it out. -
## Physics

What is the coefficient of friction on a 221.9 gram block of wood with 150 grit sandpaper on the bottom being pulled by .392 newtons. NEED HELP IMMEDIATELY!!!!!! Please and thank you -
## physics

A body of mass 'M' starts sliding down on the inclined plane where the critical angle is 30 the coefficient of kinetic friction will be ?answer is square root 3 but how?i am not getting please help. -
## physics

a 1240 kg automobile stops in a distance of 41m. if initial velocity was 22.5m/s, what force did the road exert on the car to stop it? Answer pls... Thank You -
## physics

Charged spheres A and B are in fixed positions (like in question #6) and have charges 3.6x10^-6 C and -5.4x10^-6 C respectively. Calculate the net force on sphere C, which has a charge of -9.9x10^-6 C. -
## physics

When the play button is pressed, a CD accelerates uniformly from rest to 495 rev/min in 3.1 revolutions. If the CD has a radius of 6 cm, and a mass of 17 g, what is the torque exerted on it? -
## physics

with an initial speed of 260km/h a train takes 1.50 x 10^3 m to stop on a level track. assuming the 'deceleration' is constant. what is the time in seconds taken for stopping? -
## Physics 1

A football is thrown upward at an 48◦ angle to the horizontal. The acceleration of gravity is 9.8 m/s^2. To throw an 80.4 m pass, what must be the initial speed of the ball? Answer in units of m/s. -
## physics

A cannon is fired from a cliff 190 m high downward at an angle of 21° with respect to the horizontal. If the muzzle velocity is 34 m/s, what is its speed (in m/s) when it hits the ground? -
## physics

If a violin string vibrates at 1720Hz, what is the wavelength of the sound produced in the surrounding air? (assume T=20 degree Celsius and speed is 344m/s) -
## physics

a sphere of radius r moving with velocity v through a fluid experiences a retarding force f given by F=6r^yv^zn^x where n is the viscosity of the liquid. use the method of dimensions to find the values of x,y,and z. -
## physics

what was the initial velocity of a race car traveling down a long straight track if it accelerates at 5.79m/s^2 and ends up going 163km/h in a time of 3.60 seconds? -
## physics

the surface tension Y, of liquid depends on the density,P, acceleration of gravity,g, and the height, h. use the method of dimension to derive the actual relationship between these quantities -
## Physics

Suppose you are getting ready to take a nap, and you have a choice of lying stretched out on your back on a) a bed of nails, b) a hardwood floor, or c) a couch. Which one would you choose for the most comfort, and WHY? -
## physics

Express the following measurements as indicated. A. 6.20 mg in kilograms B. 3X10^-9 s in milliseconds C. 88.0 km in meters A. 6.20mg (1g/1000mg)(1kg/1000g) You do the rest. I will be happy to critique your work. -
## physics

A ball is thrown vertically upward with a speed of 24.7 m/s from a height of 2.0 m. How long does it take to reach its highest point? The acceleration of gravity is 9.81 m/s 2 . Answer in units of s -
## physics

A ray of light in air strikes a glass plate (n = 1.50) at an incidence angle of 50 degrees. Determine the angles of the reflected and transmitted rays. -
## PHYSICS (conceptual doubt)

If a professional jumper jumps in a running train and remains in air (say for ~5 sec),does he return back to his orginal position? -
## Physics

What is the potential difference required to accelerate a deuteron of mass 3.3x10^27kg and charges 1.6x10^-19C from rest to a speed of 5.0x10^6m/s? -
## physics

A long jumper leaves the ground at an angle of 22.1◦ to the horizontal and at a speed of 10 m/s. How far does he jump? The acceleration due to gravity is 9.8 m/s2 . Answer in units of m -
## College Physics

A 3.0 kg black is at reat on a horizontal floor. If you push horizontally on the 3.0 kg block with a force of 12.0 N, it just starts to move. What is the coefficient of static friction? -
## physics

Lars, of mass 75.6 kg, has been working out and can do work for about 2.0 min at the rate of 0.980 hp (731 W). How long will it take him to climb three flights of stairs, a vertical height of 11.0 m? -
## Physics

Atomic physicists ignore the effect of gravity within an atom. To see why, Calculate and compare the gravitational and electrical forces between an electron and a proton separated by 10^-10 m. -
## Physics

A 2.0 micro farad capacitor in a circuit in series with a resistor of .0 MOhms is charged witha 6.0V battery. How long would it take to charge to 3/4 of its maximum voltage? -
## Physics

A model airplane has a mass of .90 kg and moves at a constant speed on a circle that is parallel to the ground. Find the tension in the guideline (length = 17 m) for speeds of 19 and 38 m/s. -
## physics

An example of the neutron absorption reaction is . 1 0 n+10 5 B-->7 3 Li+ 4 2 He The rest masses of each particle in atomic mass units (u) are 1 0 n= 1 u 10 5 B=10 u 7 3 Li =7 u 4 2 He= 4 u where 1u=1.66x10^-27 kg. calculate Q Q= in MeV I have the same -
## Physics

A boy whose mass is 40kg runs up a flight of 30 steps each.150mm,in 6secs find d average power developed (take g =10m/s sguaree) -
## physics

A proton with charge mass ratio of 108 C/kg is moving in a circular orbit in a uniform magnetic field of 0.5T .Calculate the frequency of revolution. -
## physics

when 100 J of work is done on a stationary flywheel ( that is otherwise free to rotate in place), its angular speed increases from 60 rev/min. What is its moment of inertia? -
## Physics

A ball of mass 8kg falls from a height of 100m,neglecting air resistance calculate it total energy after falling a distance -
## physics

The New River Gorge bridge in West Virginia is a 518 m long steel arch. How much will its length change between temperature extremes -19°C and 39°C? (answer in cm) -
## physics

Electrons move through a certain electrical circuit at an average speed of 1.7 x 10-2 m/s. How long (in minutes) does it take an electron to traverse a 1.8 -m light bulb filament coil? -
## physics

A ball is thrown vertically upward with a speed of 24.7 m/s from a height of 2.0 m. How long does it take to reach its highest point? The acceleration of gravity is 9.81 m/s 2 . Answer in units of s -
## Physics

A solenoid 74.5 cm long has 350 turns and a radius of 2.26 cm. If it carries a current of 1.69 A, find the magnetic field along the axis at its center. Answer in units of T -
## physics

two boys start running straight toward each other from two points that are 100m apart,one runs with a speed of 5m/s while the other moves at 7m/s.how close are they to the slower one's starting point when they reach each other -
## physics

a 1240 kg automobile stops in a distance of 41m. if initial velocity was 22.5m/s, what force did the road exert on the car to stop it? Answer pls... Thank You -
## physics

A ball is thrown upward from a platform 5.1 meters high with a speed of 13 m/s at an angle 45 degrees from the horizontal. what is the magnitude of its velocity when it hits the ground? -
## physics

an arresting device on a carrier deck stops an airplane in 1.5s. the avg. acceleration was 49 m/s2. what was the stopping distance? what was the initial speed? so i think v2=0, t=1.5, a= 49, so i need d and v1. i got v1=73.5 m/sec and d= 55 m. i took -
## Physics

a boy stands at a distance of 175 m from a high wall. He claps his hands and hears an echo after one second. Calculate the speed of sound in air. -
## Physics

A ball of mass 8 kg falls from rest from a height of 100 m. Neglecting air resistance, calculate its total energy after falling a distance of 40 m. -
## Physics

A ball thrown straight up at ground level passes a height of 115.7 m in 5.6 s. The acceleration of gravity is 9.8 m/s^2. What was its initial speed? Answer in units of m/s. -
## mastering physics

Find an expression for , the tension in cable 1, that does not depend on . Express your answer in terms of some or all of the variables , , and , as well as the magnitude of the acceleration due to gravity . -
## physics

Mason lifts a box off the ground and places it in a car that is 0.50 meters high. If he applies a force of 8.0 newtons to lift this suitcase, what is the work done? -
## Physics

A radiation with frequency 8.5×10^14Hz is incident on a metal emitting photo electrons. Taking Planck's constant, determine the threshold wavelength. -
## physics

From the moment a 42 m/s fastball touches the catcher's mitt until its completely stopped takes 0.014 s. Calculate the average acceleration of the ball as it is being caught. -
## physics

In a distant planet, a freely falling object gains speed at a steady rate of 25 m/s during each 1.2 seconds of fall. The gravity acceleration there is: 122 m/s2 0.05 m/s2 30 m/s2 22 m/s2 5 m/s2 20.8 m/s2 -
## Physics

A basketball is thrown at 45° to the horizontal. The hoop is located 6.2 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed? I know that I need to use d = vit + (0.5)at^2, but I then get stuck. Thanks! -
## Physics

A cannon is fired from a cliff 190 m high downward at an angle of 21° with respect to the horizontal. If the muzzle velocity is 34 m/s, what is its speed (in m/s) when it hits the ground? -
## physics

an aluminium rod has a breaking strain 0.2%.The minimum cross section area of he rd in m^2 in order to support a load of 10^4N is if young's modulus is 7*10^9 N/m^2 ans: 1.) 7.1*10^-4 -
## Physics

The range of human hearing extends from approximately 20 Hz to 20000 Hz. Find the wavelength of these extremes when the speed of sound in air is equal to 343 m/s. -
## Physics

Determine the activity of 1.11 g of 88Ra226 (a) in disintegrations per second (Bq) (b) and in Curies (Ci). The half-life is 1600 yr (1 yr = 3.156 x 10^7 s). 1 Ci is equal to 3.7 x 10^10 Bq. I keep getting the wrong answer and use the equation H=kNo -
## Physics

An antitank weapons fires a 3.5 rocket, which acquires a speed of 70 m/s after traveling 90cm down a launching tube. Find the net force during lonch? -
## physics

two boys start running straight towards each other from two points that are 100m apart. one runs with a speed of 5m/s, while other moves at 7m/s.how close are they to the slower one's starting point when they meet? -
## physics

a gun can shell targets 15 km away. find (a)the min launch speed needed to achieve that range (b) the shells flight time under these conditions -
## Scinece, Physics

A boy is throwing a stone from the top of a building. It takes projectile motion and returns to the ground. How to calculate the height of buiding? -
## physics

Details and assumptions Note: Points ABCDE are labeled for easy reference if you need to use some combination of them in a solution. Request clarification or dispute Print this -
## Physics

Find the maximum height and the time of flight of a body fired vertically up from the ground given that it loses 60 percent of its initial speed in rising 4.2m -
## physics

If a wire has a resistance of 132ohms a length of 110cm and an area of cross- sectional of 0.00415cm square find the resistivity of the material of which it is made -
## physics

A heavy freight train has a mass of 14000 metric tons. If the locomotive can pull with a force of 645000 N, how long does it take to increase it's speed from 0 to 69.8 km/h? -
## physics

A 224 g particle is released from rest at point A along the diameter on the inside of a fric- tionless, hemispherical bowl of radius 44 cm. The acceleration of gravity is 9.8 m/s2 . -
## physics

A boat, whose speed is 1.75 m/s must aim upstream at an angle of 26.3 degrees ( with respect to a line perpendicular to the shore) in order to travel directly across the stream?