# physics please HELP !

74,851 results, page 96-
## (I need alot of help in) Physics

So in physics lab we did an experiment with a cart with two different masses on a air track (practically eliminating kinetic friction). The track was tilted at 4 degrees. Using 4 photo-gates I got the speed of both gliders and the height at each point. I -
## Physics

I don't really understand this aspect of physics yet, I need help understanding these problems. Problem One: Two particles, with identical positive charges and a separation of 2.00 10-2 m, are released from rest. Immediately after the release, particle 1 -
## Physics

A physics book slides off a horizontal table top with a speed of 1.30 m/s . It strikes the floor after a time of 0.380s . Ignore air resistance. Find the height of the table top above the floor. Find the horizontal distance from the edge of the table to -
## Physics

The (nonconservative) force propelling a 1.50E3 kg car up a mountain road does 4.70E6 j of work on the car. The car starts from rest at sea level and has a speed of 27.0 m/s at an altitude of 2.00E2 m above sea level. Obtain the work done on the car by the -
## physics

Subjects Art Business Computers English Foreign Languages Health Home Economics Mathematics Music Physical Education Science Social Studies Features Contribute Download Experts Forum Job Openings Homework Tips Libraries.Jiskha Link to Us Reference School -
## PHYSICS HELP!

IMAGINE- a building 6400km. high. On the ground floor, a person weighs 175lbs when he steps on a spring scale how much would the man weigh on the same scale if he were standing at the top floor? HINT: Note that 6400km is also the radius of the earth so -
## Physics

A racing car with mass (including the driver) of 900 kg accelerates from rest to a speed of 200 km/hr in 6 seconds. what is the power output of the engine? -
## college physics

Three identical charges (q = +5.0mC) are along a circle with radius of 2.0m at angles of 30, 150, and 270 degrees. What is the the resultant electric field at the center? -
## physics

Clint Dempsey takes a free kick and kicks a soccer ball with a mass of 440 grams at 98 miles per hour. what is the momentum -
## Physics

A Particle moving with uniform acceleration is found to travel 35m in the 8th second and 51m in the 9th second. its velocity in m/sec at the beginning of 11 seconds is a> 49 b> 45 c> 47 d> 51 -
## Physics

suppose that two point charges each with a charge of +1 coulomb are separated by a distance of 1 meter will they attract or repel ? determine the magnitude of the electrical force between them -
## physics

A body is projected at an angle of 30 degree with the horizontal at initial speed of 200m/s. In how many seconds will it reach the ground? How far from the point of projection will it strike? -
## 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

A heavy freight train has a mass of 11800 metric tons. If the locomotive can pull with a force of 691000 N, how long does it take to increase it's speed from 0 to 70.3 km/h? -
## 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 heavy freight train has a mass of 11800 metric tons. If the locomotive can pull with a force of 691000 N, how long does it take to increase it's speed from 0 to 70.3 km/h? -
## physics

A 244 g particle is released from rest at point A inside a smooth hemispherical bowl of ra- dius 21.7 cm, as shown in the figure The acceleration of gravity if 9.81 m/s2 . -
## physics

Find the minimum diameter of a 51.5-m-long nylon string that will stretch no more than 1.01 cm when a load of 68.9 kg is suspended from its lower end. Assume that Ynylon = 3.51·108 N/m2. -
## physics

t(s)=0.0,1.0,2.0,3.0,4.0,5.0,6.0,7.0 v(m/s)=0.0,4.6,8.9,13.4,18.0,22.9,27.6,32.0 find the area underneath the graph between t=2.0s and t=6.0s, i know i will have to break this down into two separate shapes, a rectangle and a triangle then add them -
## Physics

An outfielder throws a 2.12 kg baseball at a speed of 114 m/s and an initial angle of 54.8 ◦ . What is the kinetic energy of the ball at the highest point of its motion? -
## physics

a book having a mass of 1.3kg lies on a shelf 1.8 m above the floors in a room whose ceiling is 2.5 m high. What is the books gravitational energy relative to the floor? -
## physics

A heavy freight train has a mass of 11800 metric tons. If the locomotive can pull with a force of 691000 N, how long does it take to increase it's speed from 0 to 70.3 km/h? -
## physics

Three charged particles are placed at the corners of an equilateral triangle of side d = 1.40 m (Fig. 16-53). The charges are Q1 = +4.0 µC, Q2 = -7.0 µC, and Q3 = -6.0 µC. Calculate the magnitude and direction of the net force on each due to the other -
## Physics

If the force of friction is constant, prove that the stopping distance of a car on a level road varies directly with the square of the initial speed. -
## physics

Young's modulus for a rod is 4 X 4x10 to the 11th power. what strain will be produced by a tensile stress of 420 MPa? I don't know where to start with this... -
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In a roller coaster ride cars and passengers slide down an incline of 36 degrees to horizontal if the friction is negligible find magnitude of acceleration -
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consider an electron near the equator. in which direction does it tend to deflect by the magnetic field of the earth if its velocity is directed a. downward b.northward c.westward d.woutheastward -
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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

A heavy freight train has a mass of 11800 metric tons. If the locomotive can pull with a force of 691000 N, how long does it take to increase it's speed from 0 to 70.3 km/h? -
## physics

I need help with conversions: Vera survived the longest fall on record without a parachute. she fell 6miles, 551 miles. whats her distance in yards? -
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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

a ball of mass 0.4 kg is initially at rest on the ground. It is kicked and leaves the kicker's foot with a speed of 5 m/s in a direction of 60 degrees above the horizontal. What is the impulse -
## Physics

Calculate the total heat content of 10 kg of ice at -23°C. (Hint: absolute zero is -273°C.) Be mindful of significant figure rules for both multiplication and addition. -
## Physics

A skier traveling 12.0 m/s reaches the foot of a steady upward 18° incline and glides 18.2 m up along this slope before coming to rest. What was the average coefficient of friction? -
## Physics

A 0.02 kg-lead bullet traveling 200 m/s strikes an armor plate and comes to a stop. If all of it's energy is converted to heat that it absorbs, what is the temperature change? -
## Physics

A 0.02 kg-lead bullet traveling 200 m/s strikes an armor plate and comes to a stop. If all of it's energy is converted to heat that it absorbs, what is the temperature change? -
## 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

Use the concepts of acceleration, force and yield strength to explain why delicate goods shipped in a cardboard box are often first packed in polystyrene foam. -
## physics

An object is placed 5 cm in front of a concave lens of focal length 7 cm. Find the image location by drawing a ray tracing diagram to scale. -
## Physics

suppose that two point charges each with a charge of +1 coulomb are separated by a distance of 1 meter will they attract or repel ? determine the magnitude of the electrical force between them -
## Physics

In Ampere's Law, the currents outside the Amperical loop DO contribute to the magnetic field B but are NOT included in the Right side of the equation with I : ç B.ds = ƒÊ * I Why? I'm so cofused. can anyone explain plzzzz.. -
## Physics

Two railroad cars, each of mass 7350 kg and traveling 80 km/h in opposite directions, collide head-on and come to rest. 1. How much thermal energy is produced in this collision? -
## Physics

An F-18 with a weight of 22500 lb lands on a carrier with a speed of 120mph. If the run-out of the arresting cable is 160ft, what is the plane's acceleration in feet per second squared? -
## Physics

A novice skier, starting from rest, slides down a frictionless 35.0 degree incline whose vertical height is 140 m. 1. How fast is she going when she reaches the bottom? -
## 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

The stability of a star is a balancing act between its own internal forces of gravity and the heat energy it produces via fusion reactions. Explain this statement -
## 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? -
## Astronomy/Physics

I cannot calculate the gravitational force between these two objects. I am confused. Jupiter (R=800 million km, M = 2 x 10 to the 27th power kg and a 100 kg person on earth. Please help! -
## physics

Find the minimum diameter of a 51.5-m-long nylon string that will stretch no more than 1.01 cm when a load of 68.9 kg is suspended from its lower end. Assume that Ynylon = 3.51·108 N/m2 -
## physics

Find the minimum diameter of a 51.5-m-long nylon string that will stretch no more than 1.01 cm when a load of 68.9 kg is suspended from its lower end. Assume that Ynylon = 3.51·108 N/m2. -
## College Physics I

A helicopter traveling upward at 120 m/s drops a package from a height of 500 meters. To the nearest second how long does it take to hit the ground? -
## physics 2 for college

a jet propelled motorcycle start from rest moves in a straightline with constant acceleration and covers a distance of 64m in 4seconds.? -
## Physics

A 500.0 g metal block absorbs 3.25 × 103 J of heat to raise its temperature by 50.0 K. What is the substance? Please show steps because I have several problems like this and then I can see where I am goibg wrong -
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A spherical baloon expands when it is taken from the cold outdors to the inside of a warm house. if its suface area increases 16%, by what percentage does the radius change -
## 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. -
## Physics

A ball has a diameter of 3.70 cm and average density of 0.0841 g/cm3. What force is required to hold it completely submerged under water? I need to find the magnitude in N Thank you! -
## Physics - thermal mechanical

During a workout, a person repeatedly lifts a 13 lb barbell through a distance of 1.5 ft. How many "reps" of this lift are required to burn off 100 Cal? -
## Physics

A 1.11 kg block slides down a 15.0 m long 32.0° incline at constant velocity. How much work is done by friction? (please help me show me how to solve using equation and where to plug the numbers) 0 is not the right answer. -
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A person with a mass of 77.5 kilograms is pushed on a sled across the frictionless surface of a frozen pond with a constant horizontal force of 14.8 Newtons. What is their acceleration? -
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A car travels in a straight line. The driver applies the brakes and comes to an abrupt stop. Durning braking, what happens to the velocity and acceleration vectors? -
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A football is thrown upward at a(n) 37 angle to the horizontal. The acceleration of gravity is 9.8 m/s2 . To throw a(n) 57.8 m pass, what must be the initial speed of the ball? Answer in units of m/s -
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to tighen a nut you exert 15N of force on wrench, which is a distance of 0.50m from pivot point. calculate amonut of torque produced... -
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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 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? -
## Math/physics

An 6 x 8 wood column is 17 feet tall and is loaded with 40 Kips. Will it buckle (K = 1.0)? How do I set this up and solve? Please show steps. I am confused and do not know how to start. Thank you. -
## Physics

Should a veterinarian be skeptical if someone said that her adult collie weighed 40.0N ? Should a nurse question a medical chart which showed that an average-looking patient had a mass of 200kg ? -
## 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

A uniform rectangular sign of width 51.6 cm, height 25.2 cm, and negligible thickness hangs vertically from supporting hinges attached at its upper edge. -
## Physics

A 103 kg sprinter wishes to accelerate from rest to a speed of 13.2 m/s in a distance of 19.3 m. What coefficient of static friction is required between the runners shoes and the track? -
## physics

a cyclist moving with constant speed 10m/s develop a power of 400 watt. Calculate the average force exerting on the bicycle -
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a particle at rest starts in horizontal strsight line with uniform acceleration ratio distance during 4th and 3rd sec ond -
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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

An electron with a kinetic energy of 0.8 keV is fired normal to the lines of a field of magnitude 50 G. Find: a)the radius of the path b)its acceleration c)its period -
## 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

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..

What is the maximum height achieved if a 0.800 kg mass is thrown straight upward with an initial speed of 40.0 m·s–1? Ignore the effect of air resistance. -
## physics

(a) A truck of mass 1870 kg travelling at 80 km/h braked to 55 km/h then continued at that speed. How much work was done by the brakes during that period? I just wanted to check my answer... 243334 J ?? -
## Physics

A particle moves according to the equation x(t) = (10 m/s2) t2 where x is in meters and t is in seconds. Find the average velocity for the time interval from t1 = 2.0 s to t2 = 3 s. Answer in units of m/s. Please help! I have no idea how to set this up :( -
## 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) A truck of mass 1870 kg travelling at 80 km/h braked to 55 km/h then continued at that speed. How much work was done by the brakes during that period? I just wanted to check my answer... 243334 J ?? -
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Simpson drives his car with an average veloc- ity of 49.7 km/h to the east. How long will it take him to drive 150 km on a straight highway? Answer in units of h -
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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 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

A hoop of radius 0.50 m and a mass of 0.20 kg is released from rest and allowed to roll down an inclined plane. How fast is it moving after dropping a vertical distance of 3.0 m ? -
## 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? -
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a circular wire loop of radius 5cm lies in the xy-plane in a magnetic field defined by B=-(4t^2+3t).determine the voltage across the resistor at time t=2s -
## PHYSICS

Scientists call a theory that unites many ideas in a simple way "beautiful." Are unity and simplicity among the criteria of beauty outside of science? Support your answer -
## 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 -
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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 -
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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

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 - Grade 10

Grant stands 3 meters from the check out at the grocery store holding a 20N bag of potatoes for 10 minutes. How much work does he perform? -
## Physics-PLEASE HELP ASAP

A tungsten target is struck by electrons that have been accelerated from rest through a 38.9-kV potential difference. Find the shortest wavelength of the radiation emitted. -
## Physics

A real spring does not oscillate forever. Instead, it eventually comes to a stop. Does this violate the Law of Conservation of Energy? Explain why or why not. I truly don't know what this means at all...can someone help me understand it? -
## Physics

What is the fundamental frequency, the first three overtones of an organ pipe that is 100cm in length ans is closed on one end and open on the other? Take the speed of sound to be 345 m/s. -
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a boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10cm high in 10 seconds. What is his power? show your workings -
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A 10 kg moving object has kinetic energy of 90 J. What is the magnitude of its momentum? [Give answer to within 2 decimal places and use proper symbols as in textbook to indicate units]. -
## Physics/Science

During a baseball game, a batter hits a pop- up to a fielder 72 m away. The acceleration of gravity is 9.8 m/s^2. If the ball remains in the air for 5 s, how high does it rise? -
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A uniform solid cylinder of mass 1kg rolls with out slipping on aflate surface at aspeed of pay/200rad/s how long will it be when they meet? -
## PHYSICS!!!

A net force of 30 N is applied to a 10 kg object, which starts at rest. What is the magnitude of its momentum after 3.0 seconds? Can someone please explain this as you go through the steps? I already know the equation is p=mv and I know that mass is 10kg